MESCHKE, Justice.
Burlington Northern Railroad Company (BN Railroad) appeals from a summary judgment declaring it responsible for the costs of necessary modifications to its bridges and culverts to accommodate drainage improvements directed by the Southeast Cass Water Resource District (District) for Cass County Drain 45. We conclude that NDCC 61 — 16.1— 42 constitutionally places upon BN Railroad the continuing responsibility for the costs of accommodating its track to necessary drainage improvements. We affirm.
I
Drain 45 was established in 1948 for part of Cass County at West Fargo along a natural channel. The drain intersects two railroad tracks operated by BN Railroad, a main line and a by-pass line. At both crossings, BN Railroad has existing openings under the tracks to accommodate the flow of water. Potential flooding in the drainage area, largely from increasing urbanization, caused the District to plan to deepen, expand, and widen Drain 45.
After the drain’s improvement, BN Railroad’s main line bridges and its by-pass line culverts will no longer accommodate the expected water flow, the District determined. The District notified BN Railroad to modify the bridges and culverts to accommodate increased runoff. If left unaltered, BN Railroad’s bridges and culverts will artificially obstruct the expected flow through Drain 45 and cause water to back up into West Fargo in times of heavy precipitation, the District determined. The need to modify the drain, the bridges, and the culverts was not disputed by BN Railroad, but it did dispute who must bear the expense of the necessary changes to the bridges and culverts.
After negotiations failed, the District sought a declaratory judgment that BN Railroad was responsible under NDCC 61-16.1-42 “for the costs associated with making the necessary openings through its trackfs] at the point where railroad track[s] and [the] [886]*886drains intersects ]” to accommodate the increased water flow. By a partial summary judgment, the trial court concluded that NDCC 61-16.1-42 required BN Railroad to bear the costs of modifying the bridges and culverts, and ruled:
[T]he requirement contained in section 61-16.1-42 of the North Dakota Century Code that railroad companies pay for the costs of making, building and keeping in repair the necessary openings at the points where drains intersect with railroad tracks is an appropriate exercise of a valid police power; and ..., therefore, section 61-16.1-42 of the North Dakota Century Code does not violate the constitutional prohibition of taking or damaging private property without just compensation as found in section 16 of article I of the North Dakota Constitution.
After other pending claims were resolved, BN Railroad appealed this final summary judgment, claiming that the statute was wrongly construed to compel the railroad to modify its existing bridges and culverts without compensation and, if the statute did place the expense on the railroad, the statute is unconstitutional as a taking of private property for public use without just compensation.
II
Section 61-16.1-42 of the North Dakota Century Code directs:
Drains along and across public roads and railroads. Drains may be laid along, within the limits of, or across any public road or highway, but not to the injury of such road. In instances where it is necessary to run a drain across a highway, the state highway department, the board of county commissioners, or the board of township supervisors, as the case may be, when notified by the water resource board to do so, shall make necessary openings through the road or highway at its own expense, and shall build and keep in repair all required culverts or bridges as provided under section 61-16.1-43. In instances where drains are laid along or within the rights of way of roads or highways, the drains shall be maintained and kept open by and at the expense of the water resource district concerned. A drain may be laid along any railroad when necessary, but not to the injury of the railroad, and ivhen it is necessary to run a drain across the railroad, the railroad company, ivhen notified by the water resource board to do so, shall make the necessary opening through such railroad, shall build the required bridges and culverts, and shall keep them in repair.
(Emphasis added). BN Railroad argues this section is not intended to compel it to modify the bridges and culverts at its own expense.
BN Railroad urges that the phrase, “at its own expense,” used in the part that describes a governmental unit’s responsibility for the opening when a drain intersects a public road or highway,1 but omitted from the part that [887]*887describes a railroad’s responsibility when the drain intersects a railroad, indicates only that the railroad must do the work and is not financially responsible for the costs. According to BN Railroad, this interpretation of the statute is supported by the Legislature’s defeat of a 1963 amendment to the precursor of NDCC 61-16.1-42 that would have added the phrase, “at its own expense,” to the part of the statute that describes the railroad’s responsibility when a drain intersects a railroad.2
The District says NDCC 61-16.1-42 places responsibility upon the railroad not only to perform the work to modify its own bridges and culverts, but also to absorb the costs of that work. Because the statute does not authorize any reimbursement to the railroad company for doing the work, the District urges that the statute plainly means that the [888]*888railroad must carry the costs. This, coupled with the lack of a procedure like that in NDCC 61-16.1-43 for cost-sharing by the district, the District says evidences an intention that the railroad is responsible for the costs of modifying its own structures. The District points out this court has already used this interpretation in State ex rel. Trimble v. Minneapolis, St. P. & S. S. M. Ry. Co., 28 N.D. 621, 150 N.W. 463 (1914), when we construed a forerunner to this statute.
Interpretation of a statute is a question of law that is fully reviewable by this Court. Zuger v. North Dakota Ins. Guar. Ass’n, 494 N.W.2d 135, 136 (N.D.1992). We first look to the language of the statute itself. Nesdahl Surveying & Eng’g v. Ackerland Corp., 507 N.W.2d 686, 688 (N.D.1993). Unless otherwise defined in the Code, words are given then- plain, ordinary, and commonly understood meaning. Kim-Go v. J.P. Furlong Enterprises, Inc., 460 N.W.2d 694, 696 (N.D.1990). Only if the language of a statute is ambiguous will extrinsic aids be used to ascertain the Legislature’s intent. Nesdahl at 689; NDCC 1-02-39. As we said in Zuger at 137, a statute is ambiguous if it is susceptible to differing, but rational, meanings.
BN Railroad and the District each offer rational but different meanings for this statute on a railroad’s responsibility for the costs of changing bridges and culverts to accommodate drainage. BN Railroad reasonably argues that use of the “at its own expense” phrase in the part of the statute on highway-drain crossings and omission of that phrase from the part of the statute on railroad-drain crossings indicates an intent to save the railroad from the costs. On the other hand, the District reasonably argues that, because the statute is silent on any reimbursement to the railroad for the necessary work, the railroad is responsible for the costs of the work that the statute directs it to do. We conclude that the statute is ambiguous.
Ill
When a statute is ambiguous, we consider the legislative history in assessing the Legislature’s intention. NDCC 1-02-39(3). BN Railroad argues the Legislature’s defeat of the proposed 1963 amendment to the forerunner of NDCC 61-16.1-42, that would have added the phrase, “at its own expense,” to the part of the section on a drain intersecting a railroad, shows the Legislature’s intention that the railroad not absorb the costs of the work.
While a subsequent amendment to a statute may be useful sometimes to shed light on the intent of an earlier version of the statute, Effertz v. North Dakota Workers Compensation Bureau, 525 N.W.2d 691 (N.D.1994), legislative inaction is rarely helpful. In State ex rel. Spaeth v. Eddy Furniture Co., 386 N.W.2d 901, 904 (N.D.1986), we held a later Legislature’s defeat of an amendment on the subject cannot evidence what a prior Legislature intended when it first enacted the statute. Since then, we have often pointed out that the defeat of a proposed amendment by a later Legislature does not help answer questions about the original intent of an enactment. Peterson v. McKenzie County School Dist. 1, 467 N.W.2d 456, 462 (N.D.1991); Coles v. Glenburn Public School Dist. 26, 436 N.W.2d 262, 264 n. 2 (N.D.1989). That reasoning applies here.
Any attempt to glean legislative intent from the actions of the 1963 Legislature would be especially futile in this case because diametrically different amendments to the forerunner of this section were defeated. See Footnote 2. One proposed amendment would have specified the railroad perform the work “at its own expense”; the other would have divided the costs of work on the railroad’s crossings equally between the railroad and the water management district. Just as one could speculate that rejection of the “at its own expense” amendment indicates the Legislature’s intention that the railroad should not be responsible for the cost, so too could one speculate that rejection of the cost-sharing amendment indicates the Legislature’s intention that the railroad is responsible for the whole cost. The inaction of the 1963 Legislature does not clarify this ambiguity.
When a statute is ambiguous, we also consider the “common law or former statutory provisions, including laws upon the same or [889]*889similar subjects,” as well as the “circumstances under which the statute was enacted.” NDCC 1-02-39(2) and (4). BN Railroad argues that requiring a railroad to pay for the work “is contrary to the express statutory procedure adopted by the Legislature to pay for water and drain projects.” But the statutes cited by BN Railroad, NDCC 61-16.1-06, -15 to -18, -20, treat how . a water resource district finances general drainage costs and assesses them against affected landowners. Those statutes do not fix what costs a district must pay. On the other hand, NDCC 61-16.1^42 and -43 treat what intersection costs a district must bear. The latter sections do not specify that a district is obligated to pay any of the costs for a drain to go under a railroad track. No statute authorizes cost-sharing with or reimbursement to a railroad for the costs of modifying bridges and culverts to accommodate drainage.
Historically, this statute about the intersection of a drain with a railroad has remained virtually the same since its inception in 1895.3 See Footnote 2. That language was interpreted by this Court in State ex rel. Trimble v. Minneapolis, St. P. & S. S. M. Ry. Co., 28 N.D. 621, 150 N.W. 463 (1914). Trimble considered planned drainage improvements for the Mouse River, a non-navigable natural watercourse that drained parts of several counties. Removal of six rows of piling supporting the railroad bridge across the river, built ten years earlier, was “necessary to obtain the flow which the [engineer’s] plans contemplate.” Trimble 150 N.W. at 464. This Court held that the railroad was required to remove, at its own expense, any artificial obstructions, like the pilings, to the flow of the modified drainage channel. Trimble explained that “if a railway crosses an unnavigable stream which serves for the drainage of any given area of land, it must accommodate itself to the drainage that may be reasonably anticipated, both present and prospective.” Id. at 466. Also, after quoting the forerunner to NDCC 61-16.1-42, section 1837 of the 1905 Revised Codes of North Dakota, the Court reasoned:
It may be conceded that the drainage board had the right as agents of the parties interested and perhaps of the state as [890]*890a whole to require the removal of any material and artificial obstructions to the flowage of the water in the stream. It may also be conceded that the upper riparian owners would have had the right in case of an obstruction which was injurious to them, or in case of the failure of the railway company to remove the same, to themselves enter upon the land of such company and to remove it at its expense.
Trimble at 470 (emphasis added). We have no doubt the Trimble statements accurately depicted the prevailing understanding at the time, and clearly applied the statute to make the railroad responsible for the modification costs as well as the work.
Statutes that are substantially the same as previously existing statutes are construed as continuations of the same law. State ex rel. Sprynczynatyk v. Mills, 523 N.W.2d 537, 540 (N.D.1994); NDCC 1-02-25. That part of the original statute has remained intact to this day. Related statutes reinforce this interpretation. NDCC 61-16.1-09(16) authorizes the District to “[o]rder or initiate appropriate legal action to compel the entity responsible for the maintenance and repair of any bridge or culvert to remove ... any artificial block which hinders or decreases the flow of water through such bridge or culvert.” Another subsection directs railroads to “cooperate with [water resource] districts in this effort” to “[c]oordi-nate proposals for installation, modification, or construction of culverts and bridges ... to achieve appropriate sizing and maximum consistency of road openings.” NDCC 61 — 16.1— 09(21). We therefore conclude that NDCC 61-16.1-42 places continuing responsibility for the costs of accommodating the increased drainage in this case upon BN Railroad.
Still, our inquiry is not complete. If a statute is susceptible of two constructions, one that would render it of doubtful constitutionality and one that would not, the constitutional one must be selected. Matter of Adoption of K.A.S., 499 N.W.2d 558, 567 (N.D. 1993); NDCC 1-02-38(1). We therefore consider BN Railroad’s argument that NDCC 61-16.1-42 as so construed would violate the North Dakota Constitution.
IV
The North Dakota Constitution, art. I, § 16, directs that “[p]rivate property shall not be taken or damaged for public use without just compensation.... ” Yet, we cannot interpret our state constitution to grant narrower rights than guaranteed by the federal constitution. See State v. Matthews, 216 N.W.2d 90, 99 (N.D.1974). So we look to both state and federal precedents on regulatory taking of private property for public use.
BN Railroad submits that the required changes will “involve between three and four hundred thousand dollars and the substantial rerouting of railroad traffic,” creating “an unjustified expense for which [the railroad] itself will derive no benefit.” “By forcing [it] to comply with Section 61 — 16.1— 42,” BN Railroad argues, the Distinct “has effectively taken [BN Railroad’s] right-of-ways crossing Drain 45 and committed them to public use.” BN Railroad centers its argument on this Court’s recognition that the scope of the North Dakota constitutional clause on takings for public use is broader in some respects than its Fifth Amendment counterpart in the United States Constitution, citing Grand Forks-Traill Water Users, Inc. v. Hjelle, 413 N.W.2d 344 (N.D.1987), appeal dismissed 484 U.S. 1053, 108 S.Ct. 1002, 98 L.Ed.2d 969 (1988). In addition, BN Railroad points out, citing Minch v. City of Fargo, 332 N.W.2d 71 (N.D.1983), cert. denied 464 U.S. 829, 104 S.Ct. 105, 78 L.Ed.2d 108 (1983), a public entity can cause compen-sable damage to property without fully taking it.
The District relies on clear precedents, both federal and state, for its argument that there is no compensable taking in requiring a railroad to absorb the costs of changing its bridges and culverts to accommodate drainage changes. Chicago, B. & Q. Ry. Co. v. Illinois ex rel. Grimwood, 200 U.S. 561, 26 S.Ct. 341, 50 L.Ed. 596 (1906); City of Grafton v. St. Paul, M. & M. Ry. Co., 16 N.D. 313, 113 N.W. 598 (1907); State ex rel. Trimble v. Minneapolis, St. P. & S. S. M. Ry. Co., 28 N.D. 621, 150 N.W. 463 (1914); Lake Shore & Michigan S. Ry. Co. v. Clough, 242 U.S. 375, 37 S.Ct. 144, 61 L.Ed. 374 (1917). [891]*891Each of these decisions held that a state’s police-power regulation that required a railroad to adjust its track for the intersection of a public way was not a taking of the railroad’s property for public us.e.
In Grimwood, the earliest of these precedents, the railroad’s bridge crossed a creek. The drainage district proposed modifications to the creek to improve the drainage structure and to better drain land upstream. The drainage district notified the railroad of its statutory responsibility to build a new bridge at the intersection with the creek to suitably accommodate the modified channel. The Supreme Court summarized the railroad’s argument:
The contention of the railway company is that, as its present bridge was lawfully constructed, under its general corporate power to build, construct, operate and maintain a railroad, in the county and township aforesaid, and as the depth and width of the channel under it were sufficient, at the time, to carry off the water of the creek as it then flowed, and now flows — the foundation of the bridge cannot be removed and its use of the bridge disturbed, unless compensation be first made or secured to it in such amount as will be sufficient to meet the expense of removing the timbers and stones from the creek and of constructing a new bridge of such length and with such opening under it as the plan of the Commissioners requires. The company insists that to require it to meet these expenses out of its own funds will be, within the meaning of the Constitution, a taking of its property for public use without compensation, and, therefore, without due process of law, as well as a denial to it of the equal protection of the laws.
Grimwood, 200 U.S. at 582, 26 S.Ct. at 345. The Supreme Court ruled it was the railroad’s implied-in-law duty to maintain an opening under the bridge adequate to accommodate “the volume of water as might result from lawful, reasonable regulations established by appropriate public authority from time to time for the drainage of lands on either side of the creek.” Id at 586, 26 S.Ct. at 347. The Supreme Court adopted the lower court’s summary of the applicable law:
“[WJhere there is a natural waterway, or where a highway already exists and is crossed by a railroad company under its general license to build a railroad, and without any specific grant by the legislative authority to obstruct the highway or waterway, the railroad company is bound to make and keep its crossing, at its own expense, in such condition as shall meet all the reasonable requirements of the public as the changed conditions and increased use may demand.”
Id at 587, 26 S.Ct. at 347 (quoting Chicago, B. & Q. Ry. Co. v. People ex rel. Grimwood, 212 Ill. 103, 72 N.E. 219, 223 (1904)). The Supreme Court summarily rejected the railroad’s taking claim:
[W]e hold it to be the duty of the railway company, at its own expense, to remove from the creek the present bridge, culvert, timbers and stones placed there by it, and also (unless it abandons or surrenders its right to cross the creek at or in the vicinity of the present crossing) to erect at its own expense and maintain a new bridge for crossing that will conform to the regulations established by the Drainage Commissioners, under the authority of the State; and such a requirement if enforced will not amount to a taking of private property for public use within the meaning of the Constitution, nor to a denial of the equal protection of the laws.
Grimwood, 200 U.S. at 595, 26 S.Ct. at 351. Thus, Grimwood held that requiring a railroad at its own expense to modify its bridge across a dram to conform to a state regulation is not a taking of private property for public use.
In City of Grafton, 113 N.W. 598, the city condemned for street purposes a strip of land within the railroad’s right of way. The railroad sought reimbursement for costs of structural changes such as grading, planking, and building sidewalks. The city responded that these expenses were “made necessary by a statute of this state, enacted under the so-called police power of the state, and therefore that they cannot be considered a proper element of damage in this action.” City of Grafton at 601. This court held that [892]*892the railroad’s expenses for the structural changes were not compensable:
[T]he United States Supreme Court, under a statute identically the same as our own, held that no damages could be allowed for structural changes made necessary by such crossing, and they also held, for reasons which appeal to us as clearly sound and unanswerable, that such expenditures are made necessary in order to comply with the express statutory enactments aforesaid, which are construed as mere police regulations. As stated by the Supreme Court of the United States in C., B. & Q. Ry. Co. v. Chicago, [166 U.S. 226, 17 S.Ct. 581, 41 L.Ed. 979 (1897)]: “The expense of erecting gates, planking the crossings, and maintaining flagment [sic], which will necessarily result in the laying out of a street across a railroad, must be regarded as incidental to the exercise of the police powers of the state, and do not constitute an element of just compensation to the railroad.”
Id. 113 N.W. at 602. The expenses of a railroad to comply with a reasonable police-power regulation is not a compensable taking.4
Lake Shore, a federal precedent like the North Dakota precedent in Trimble discussed earlier, considered changes in drainage that compelled a railroad to modify its crossing. In Lake Shore, acting under an indiana Railway Law that required railroads to construct their railways over watercourses “so as not to interfere with the free use of the same,” a drainage commission approved plans for an artificial drainage channel that required railroads to absorb substantial expense in bridging the channel. One of the railroads had earlier constructed a bridge that did not obstruct the stream’s natural flow. The railroads argued, because their railroads were not within the area to be drained, they did not contribute to the need for drainage, they would not be benefited, and their tracks could only be taken with appropriate compensation. The Supreme Court observed that none of the railroad lands were actually “expropriated,” but the damage was “confined to a temporary inconvenience in the use of their rights of way pending the construction of the drain and the necessity for making substantial expenditures of money in order to pass their railroads over the new watercourse.” Lake Shore, 242 U.S. at 379, 37 S.Ct. at 146.
In view of the obligations assumed by the respective companies when they accepted their franchises at the hands of the State, it is very clear that the State may exercise its police power in laying out an artificial watercourse across the rights of way without making compensation to the companies for the inconvenience and expense to which [893]*893they are thereby subjected, unless, indeed, it be made to appear that the power is being exerted arbitrarily, or wantonly, or for private as distinguished from public benefit, or otherwise in disregard of the fundamental rights of the companies concerned, in either of which cases there would be an abuse rather than an exercise of the power, and the project could not lawfully be carried out against their opposition, with or without compensation.
Id. at 382, 37 S.Ct. at 147. See also Wabash Ry. Co. v. South Daviess County Drainage Dist., 12 F.2d 909, 914-15 (8th Cir.1926) (same, relying on Lake Shore), cert. denied, 273 U.S. 751, 47 S.Ct. 455, 71 L.Ed. 873 (1927). These precedents, federal and state, demonstrate that continuing police-power regulations that compel a railroad to adjust to drainage changes without compensation are not a compensable taking.5
Several other North Dakota constitutional clauses, first adopted at its 1889 Constitutional Convention over a hundred years ago, are relevant to the police-power analysis here. See N.D. Const, art. XII, § 13 (“Railways ... are hereby declared public highways, and all railroad[s] ... are declared to be common carriers and subject to legislative control; ... ”); art. XII, § 5 (“the exercise of the police power of this state shall never be abridged, or so construed as to permit corporations to conduct their business in such a manner as to infringe the equal rights of individuals or the general well-being of the state”).6 In Wabash Ry. Co. v. South Da-[894]*894viess County Drainage Dist., 12 F.2d 909, the federal court for this circuit held that a Missouri railroad was not entitled to damages for the costs of a bridge across a new artificial waterway created by a lateral diversion ditch from a creek to the main drainage channel. The circuit court relied on the Missouri Constitution of 1875, art. 12, § 5, a constitutional clause virtually identical to the present art. XII, § 5 (quoted above) of the North Dakota Constitution, reserving state police power over corporations.7
Any doctrinal turmoil in the United States Supreme Court about regulatory takings has not reached anything like the subject of police-power regulation of railroads. Indeed, the Supreme Court recently acknowledged that it “ ‘has generally “been unable to develop any ‘set formula’ for determining when ‘justice and fairness’ require that economic injuries caused by public action” ’ must be deemed a compensable taking.” Ruckelshaus v. Monsanto Co., 467 U.S. 986, 1005, 104 S.Ct. 2862, 2874, 81 L.Ed.2d 815 (1984) (citations omitted). Monsanto was an important precedent that we studied in Northern States Power v. N.D. Pub. Serv. Comm’n, 502 N.W.2d 240 (N.D.1993) (N.S.P.). In Monsanto, the Supreme Court held that “to the extent that Monsanto, an applicant for registration of pesticides [by the Environmental Protection Agency], had a confidential economic interest in its health, safety, and environmental data that was cognizable as a property right in a trade secret under state law, that property right was protected by the Taking Clause of the Fifth Amendment to the United States Constitution.” N.S.P. at 245. There, the Supreme Court in Monsanto, 467 U.S. at 1005, 104 S.Ct. at 2874 (citation omitted), used an analysis that balanced three factors to determine whether a regulation under the police power created a taking: “ ‘the character of the governmental action, its economic impact, and its interference with reasonable investment-backed expectations.’ ”
The Monsanto opinion distinguished between different statutory patterns that regulated registration of pesticides at different [895]*895times. Id. After 1978 congressional amendments, which established the data-disclosure mechanisms attacked as takings, had put Monsanto “on notice of the manner in which EPA was authorized to use and disclose any data turned over to it by an applicant for registration,” Monsanto “could not have had a reasonable, investment-backed expectation that EPA would keep the data confidential beyond the limits prescribed in the amended statute itself.” 467 U.S. at 1006, 104 S.Ct. at 2874. Only while earlier congressional enactments “had explicitly guaranteed to Monsanto ... an extensive measure of confidentiality and exclusive use” would EPA’s disclosure of Monsanto’s trade secrets effect a taking. Id. at 1011, 104 S.Ct. at 2877.
Monsanto could not successfully challenge “the ability of the Federal Government to regulate the marketing and use of pesticides,” because “such [police-power] restrictions are the burdens we all must bear in exchange for ‘ “the advantage of living and doing business in a civilized community.” ’ ” Id. at 1007, 104 S.Ct. at 2874 (citations and footnotes omitted). In this drainage case, over a century of constitutional and legislative regulation of railroads under the state police power is one of the burdens that the railroads must bear in exchange for doing business in a civilized context. This enduring regulation, having controlled the railroad’s conduct for so long, defeats any investment-based expectation that would transform the railroad’s established duty to accommodate drainage improvements into a compensable taking.
Similarly, in N.S.P., we employed the Monsanto regulatory-taking analysis to examine NSP’s claim that its trade secrets were being unconstitutionally taken by disclosure laws long applicable to a public utility: “[A]s long as NSP is aware of the open-records law under which its contracts are filed with the PSC, and the filing requirement is rationally related to the legitimate state purpose of public utility regulation, ‘a voluntary submission of data by [a public utility] in exchange for the economic advantages of [regulation] can hardly be called a taking.’ ” N.S.P., 502 N.W.2d at 247. While this parallel may not be complete, BN Railroad’s obligation to adjust its bridges across this public drain, under a long-standing regulatory pattern that imposes the costs of accommodating the public’s need for drainage improvements on the railroad itself, can hardly become a taking when the public reasonably requires the change.8
Other recent precedents do not reflect any significant shift in this genre of regulatory-taking analyses. See Penn Central Transp. Co. v. City of New York, 438 U.S. 104, 98 S.Ct. 2646, 57 L.Ed.2d 631 (1978) (Comprehensive program to preserve historic landmarks by prohibiting new construction did not effect a taking requiring compensation); Keystone Bituminous Coal Ass’n v. DeBenedictis, 480 U.S. 470, 107 S.Ct. 1232, 94 L.Ed.2d 472 (1987) (Regulation under Pennsylvania’s Bituminous Mine Subsidence and Land Conservation Act that required 50% of the coal beneath certain areas to be kept in place to provide surface support did not constitute a taking of private property without just compensation in violation of Fifth and Fourteenth Amendments.). The 1987 Keystone decision effectively weakens the prece-dential value of Pennsylvania Coal Co. v. Mahon, 260 U.S. 393, 43 S.Ct. 158, 67 L.Ed. 322 (1922), sometimes cited as a landmark in modern regulatory-taking doctrine. See also Grand Forks-Traill Water Users, Inc. v. Hjelle, 413 N.W.2d 344 (N.D.1987), appeal [896]*896dismissed 484 U.S. 1053, 108 S.Ct. 1002, 98 L.Ed.2d 969 (1988) (no regulatory taking where statutes required a utility to move, at its own expense, its water lines installed within a fixed distance of the center line of a highway, although not within the highway right-of-way, when the highway was later widened).
Nor do the most recent decisions of the United States Supreme Court change the constitutional analysis for legislated police-power regulation. See Nollan v. California Coastal Comm’n, 483 U.S. 825, 107 S.Ct. 3141, 97 L.Ed.2d 677 (1987) (agency could not, without paying compensation, condition grant of permission to rebuild larger home on beachfront lot upon owner’s transfer to public of an easement for lateral access across beach between two public beaches); Dolan v. City of Tigard, — U.S.-, 114 S.Ct. 2309, 129 L.Ed.2d 304 (1994) (approving floodplain zoning as a condition of an adjacent non-floodplain building permit for an individual owner, but rejecting conditions requiring dedication of the zoned greenway to public use for a storm drainage system, and dedication of an adjacent 15-foot strip as a pedestrian/bicycle pathway, as unconstitutional without individualized determinations of the reasonable relationship of the dedications to the legitimate public purposes of flood control and reduction of traffic congestion). Dolan explained:
A land use regulation does not effect a taking if it “substantially advance[s] legitimate state interests” and does not “den[y] an owner economically viable use of his land.”
The sort of land use regulations discussed in the cases just cited, however, differ in two relevant particulars from the present case. First, they involved essentially legislative determinations classifying entire areas of the city, whereas here the city made an adjudicative decision to condition petitioner’s application for a building permit on an individual parcel. Second, the conditions imposed were not simply a limitation on the use petitioner might make of her own parcel, but a requirement that she deed portions of the property to the city.
• — ■ U.S. at-, 114 S.Ct. at 2316 (citations omitted). BN Railroad’s duty in this ease arises not from a municipal “adjudicative decision to condition,” but rather from an express and general legislated duty under a constitutional reservation of police power over a corporation. NDCC 61-16.1-42 substantially advances a legitimate state interest in drainage and does not deny the railroad economically viable use of its track.
We conclude that NDCC 61-16.1-42 constitutionally places upon BN Railroad the continuing responsibility for the costs of accommodating its track to necessary drainage improvements. Therefore, we affirm.
LEVINE and NEUMANN, JJ., concur.