FARRIS, Circuit Judge:
This is an appeal from a district court decision denying the Army Corps of Engineers jurisdiction under the Clean Water Act, 33 U.S.C. § 1251 et seq., over a parcel of land near the San Francisco Bay. 700 F.Supp. 476. The Corps had sought to require the landowner to obtain a permit before draining and filling the land, which over many years had acquired some aquatic characteristics. The district court found that because these conditions were artificial and were in part caused by the government, the Corps lacked jurisdiction. We reverse and remand.
BACKGROUND
This dispute revolves around a 153 acre tract of undeveloped land south of San Francisco, called the Newark Coyote Property, owned by Leslie Salt. A road separates the property into two parcels, one of 143 acres (“parcel 143”) and one of 10 acres (“parcel 10”). The property abuts the San Francisco National Wildlife Refuge and lies approximately one quarter mile from the Newark Slough, a tidal arm of the San Francisco Bay.
The present condition of the property, or rather its condition in late 1985 through 1986 when the Corps claimed jurisdiction, is the result of many artificial changes to the property over the last 100 years. Originally the property was pasture land. The first change occurred early in this century, when Leslie’s predecessors in interest constructed facilities for the manufacture of salt. They excavated pits on the eastern one-third of parcel 143 for depositing calcium chloride, and created large, shallow, water-tight basins on the western two-thirds for crystallizing salt. Salt production on the property effectively stopped in 1959. The calcium chloride pits and the crystallizers remained however, and each year they temporarily filled with water during the winter rainy season.1 The extent of ponding is limited, but standing water did form on the property and remain long enough for fish to live in the ponds. Plant [356]*356life, which had been nonexistent due to the high salinity and compaction of the soil, formed in the crystallizers after Leslie plowed the property in 1983 to combat a dust problem.
The property was also substantially affected by construction of a sewer line and public roads on and around the property. This construction created ditches, road beds, and most importantly, culverts which hydrologically connected the property to the Newark Slough. Caltrans, the state highway authority, also breached a levy on the wildlife refuge adjacent to the property and destroyed a tidegate which had prevented the tidal backflow from reaching Leslie’s property.
The effect of all this human activity was to foster natural, ecological developments: tidewater reached the edges of Leslie’s property and caused the creation of some wetland features on the southern fringes. Migratory birds used the crystallizers and calcium chloride pits as habitat during the winter and spring when they were flooded. In addition, an endangered species, the salt marsh harvest mouse, used the property as habitat.
The controversy over this property arose in late 1985 when Leslie started to dig a feeder ditch and siltation pond on parcel 143 in order to drain the land. The Corps soon became aware of this activity and responded by issuing a cease and desist order pursuant to its authority under Section 404 of the Clean Water Act.2 In that Act Congress directed the Corps, through the Secretary of the Army, to “restore and maintain the chemical, physical, and biological integrity of the Nation's waters.” 33 U.S.C. § 1251(a). The Corps claimed that Leslie was discharging a pollutant (fill) into waters of the United States in violation of section 301 of the Act.3 The Corps also claimed that Leslie’s activities were obstructing the navigable waters of the United States in violation of section 10 of the Rivers and Harbors Appropriations Act.4 The Corps issued a second cease and desist order in early 1987 to stop Leslie from placing fill on parcel 10. The Corps issued that order in response to Leslie’s attempts to block a culvert that connected its property to the Newark Slough.
In sum, the Corps claimed jurisdiction over the majority of the property. Leslie challenged that claim of jurisdiction and filed suit; the Corps countersued. The district court found in favor of Leslie on all grounds, holding that the property was not subject to the Corps’ jurisdiction. The United States appealed that decision. Save San Francisco Bay Association and the National Audubon Society intervened on behalf of the United States.
The Corps now asserts jurisdiction over the property based on two separate theories which apply to two distinct portions of Leslie’s land. First, the Corps argues that most of parcel 10 and the southern tip of parcel 143 are adjacent wetlands that are part of the Corps’ Clean Water Act jurisdiction.5 To resolve this dispute we must first [357]*357determine whether Congress intended that Clean Water Act jurisdiction should extend to property which government actions helped make aquatic. Because we find that it did, we then look to the Corps’ regulations interpreting the Act, to determine whether they allow Corps jurisdiction. The Corps’ second theory relates to the former crystallizers and calcium chloride pits. The Corps claims that these features are “other waters,” as defined by Corps’ regulations, that are subject to its jurisdiction.
STANDARD OF REVIEW
The district court’s findings of fact are subject to a clearly erroneous standard of review. Issues of law, as well as mixed questions of fact and law that involve consideration of legal concepts rather than essentially factual inquiries, are reviewable de novo. United States v. McConney, 728 F.2d 1195, 1200-02 (9th Cir.), cert. denied, 469 U.S. 824, 105 S.Ct. 101, 83 L.Ed.2d 46 (1984).
When considering the Corps’ interpretation of the Clean Water Act we defer to the agency’s analysis if it is “reasonable and not in conflict with the expressed intent of Congress.” United States v. Riverside Bayview Homes, 474 U.S. 121, 131, 106 S.Ct. 455, 461, 88 L.Ed.2d 419 (1985); Chevron U.S.A., Inc. v. NRDC, 467 U.S. 837, 844-45, 104 S.Ct. 2778, 2782-83, 81 L.Ed.2d 694 (1984). The agency’s interpretation of its own regulations is entitled to greater deference, amounting to a plain error standard. Montana Power Co. v. EPA, 608 F.2d 334, 345 (9th Cir.1979); Chemical Waste Management, Inc. v. EPA, 873 F.2d 1477 (D.C.Cir.1989).
THE SOUTHERN PORTIONS OF THE PROPERTY
The Corps claims that the southern portions of the property are wetlands within its jurisdiction.6 The district court denied the Corps jurisdiction for three reasons: (1) the wetland conditions were caused by the government, (2) the conditions were not “normal,” as required by 33 C.F.R.
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FARRIS, Circuit Judge:
This is an appeal from a district court decision denying the Army Corps of Engineers jurisdiction under the Clean Water Act, 33 U.S.C. § 1251 et seq., over a parcel of land near the San Francisco Bay. 700 F.Supp. 476. The Corps had sought to require the landowner to obtain a permit before draining and filling the land, which over many years had acquired some aquatic characteristics. The district court found that because these conditions were artificial and were in part caused by the government, the Corps lacked jurisdiction. We reverse and remand.
BACKGROUND
This dispute revolves around a 153 acre tract of undeveloped land south of San Francisco, called the Newark Coyote Property, owned by Leslie Salt. A road separates the property into two parcels, one of 143 acres (“parcel 143”) and one of 10 acres (“parcel 10”). The property abuts the San Francisco National Wildlife Refuge and lies approximately one quarter mile from the Newark Slough, a tidal arm of the San Francisco Bay.
The present condition of the property, or rather its condition in late 1985 through 1986 when the Corps claimed jurisdiction, is the result of many artificial changes to the property over the last 100 years. Originally the property was pasture land. The first change occurred early in this century, when Leslie’s predecessors in interest constructed facilities for the manufacture of salt. They excavated pits on the eastern one-third of parcel 143 for depositing calcium chloride, and created large, shallow, water-tight basins on the western two-thirds for crystallizing salt. Salt production on the property effectively stopped in 1959. The calcium chloride pits and the crystallizers remained however, and each year they temporarily filled with water during the winter rainy season.1 The extent of ponding is limited, but standing water did form on the property and remain long enough for fish to live in the ponds. Plant [356]*356life, which had been nonexistent due to the high salinity and compaction of the soil, formed in the crystallizers after Leslie plowed the property in 1983 to combat a dust problem.
The property was also substantially affected by construction of a sewer line and public roads on and around the property. This construction created ditches, road beds, and most importantly, culverts which hydrologically connected the property to the Newark Slough. Caltrans, the state highway authority, also breached a levy on the wildlife refuge adjacent to the property and destroyed a tidegate which had prevented the tidal backflow from reaching Leslie’s property.
The effect of all this human activity was to foster natural, ecological developments: tidewater reached the edges of Leslie’s property and caused the creation of some wetland features on the southern fringes. Migratory birds used the crystallizers and calcium chloride pits as habitat during the winter and spring when they were flooded. In addition, an endangered species, the salt marsh harvest mouse, used the property as habitat.
The controversy over this property arose in late 1985 when Leslie started to dig a feeder ditch and siltation pond on parcel 143 in order to drain the land. The Corps soon became aware of this activity and responded by issuing a cease and desist order pursuant to its authority under Section 404 of the Clean Water Act.2 In that Act Congress directed the Corps, through the Secretary of the Army, to “restore and maintain the chemical, physical, and biological integrity of the Nation's waters.” 33 U.S.C. § 1251(a). The Corps claimed that Leslie was discharging a pollutant (fill) into waters of the United States in violation of section 301 of the Act.3 The Corps also claimed that Leslie’s activities were obstructing the navigable waters of the United States in violation of section 10 of the Rivers and Harbors Appropriations Act.4 The Corps issued a second cease and desist order in early 1987 to stop Leslie from placing fill on parcel 10. The Corps issued that order in response to Leslie’s attempts to block a culvert that connected its property to the Newark Slough.
In sum, the Corps claimed jurisdiction over the majority of the property. Leslie challenged that claim of jurisdiction and filed suit; the Corps countersued. The district court found in favor of Leslie on all grounds, holding that the property was not subject to the Corps’ jurisdiction. The United States appealed that decision. Save San Francisco Bay Association and the National Audubon Society intervened on behalf of the United States.
The Corps now asserts jurisdiction over the property based on two separate theories which apply to two distinct portions of Leslie’s land. First, the Corps argues that most of parcel 10 and the southern tip of parcel 143 are adjacent wetlands that are part of the Corps’ Clean Water Act jurisdiction.5 To resolve this dispute we must first [357]*357determine whether Congress intended that Clean Water Act jurisdiction should extend to property which government actions helped make aquatic. Because we find that it did, we then look to the Corps’ regulations interpreting the Act, to determine whether they allow Corps jurisdiction. The Corps’ second theory relates to the former crystallizers and calcium chloride pits. The Corps claims that these features are “other waters,” as defined by Corps’ regulations, that are subject to its jurisdiction.
STANDARD OF REVIEW
The district court’s findings of fact are subject to a clearly erroneous standard of review. Issues of law, as well as mixed questions of fact and law that involve consideration of legal concepts rather than essentially factual inquiries, are reviewable de novo. United States v. McConney, 728 F.2d 1195, 1200-02 (9th Cir.), cert. denied, 469 U.S. 824, 105 S.Ct. 101, 83 L.Ed.2d 46 (1984).
When considering the Corps’ interpretation of the Clean Water Act we defer to the agency’s analysis if it is “reasonable and not in conflict with the expressed intent of Congress.” United States v. Riverside Bayview Homes, 474 U.S. 121, 131, 106 S.Ct. 455, 461, 88 L.Ed.2d 419 (1985); Chevron U.S.A., Inc. v. NRDC, 467 U.S. 837, 844-45, 104 S.Ct. 2778, 2782-83, 81 L.Ed.2d 694 (1984). The agency’s interpretation of its own regulations is entitled to greater deference, amounting to a plain error standard. Montana Power Co. v. EPA, 608 F.2d 334, 345 (9th Cir.1979); Chemical Waste Management, Inc. v. EPA, 873 F.2d 1477 (D.C.Cir.1989).
THE SOUTHERN PORTIONS OF THE PROPERTY
The Corps claims that the southern portions of the property are wetlands within its jurisdiction.6 The district court denied the Corps jurisdiction for three reasons: (1) the wetland conditions were caused by the government, (2) the conditions were not “normal,” as required by 33 C.F.R. § 328.3(b), and (3) the property was not adjacent to waters of the United States, as required by 33 C.F.R. § 328.3(a)(7).
A. Governmentally Caused Inundation
We agree with the district court that Congress intended to create a very broad grant of jurisdiction in the Clean Water Act, extending to any aquatic features within the reach of the commerce clause power. See Leslie Salt Co. v. Froehlke, 578 F.2d 742, 755 (9th Cir.1978) (citing California v. EPA, 511 F.2d 963, 964 n. 1 (9th Cir.1975), rev’d on other grounds, 426 U.S. 200, 96 S.Ct. 2022, 48 L.Ed.2d 578 (1976)). However, the district court made an exception to this broad Congressional mandate and held that changes to the property caused by the government do not create jurisdiction. The court reasoned that a contrary holding would allow the Corps “to expand its own jurisdiction by creating some wetland conditions where none existed before.” While this is a valid concern, the facts of this case do not present such a problem.
The district court relied upon United States v. City of Fort Pierre, 747 F.2d 464 (8th Cir.1984). In Fort Pierre, the Corps asserted section 404 jurisdiction over a dry slough that had begun to exhibit wetland characteristics as a direct result of the Corps’ dredging activity on a nearby river. The Eighth Circuit held that the Corps did not have jurisdiction due to the “peculiar facts and unique circumstances” of that case, in which “the Corps, as an unintended by-product of ordinary river maintenance, inadvertently create[d] a wetland-type ecological system on private property where no such system previously existed.” Id. at 466, 481. The Eighth Circuit recently re[358]*358affirmed limiting Fort Pierre to these specific facts. See United States v. Southern Inv. Co., 876 F.2d 606, 612 (8th Cir.1989).
The factual situation in this case differs substantially from that in Fort Pierre. Here, the Corps was not directly and solely responsible for flooding Leslie’s land: Cal-trans constructed the culverts which allowed water to flow onto Leslie’s property; Caltrans and the Fish and Wildlife Service breached the levee on the wildlife refuge adjacent to Leslie’s property which allowed water to flow up the culverts; Caltrans and the Fish and Wildlife Service failed to place effective floodgates on the culverts; Leslie itself maintained floodgates which unknown third parties propped open. Contrary to the district court’s conclusion, the Corps did not itself create the wetland conditions and thereby attempt to expand its own jurisdiction.7
The fact that third parties, including the government, are responsible for flooding Leslie’s land is irrelevant. The Corps’ jurisdiction does not depend on how the property at issue became a water of the United States. Congress intended to regulate local aquatic ecosystems regardless of their origin. See, e.g., Swanson v. United States, 789 F.2d 1368 (9th Cir.1986) (Corps construction of a dam creates waters under Corps jurisdiction); United States v. Tull, 769 F.2d 182, 184 (4th Cir.1985) (federal construction of mosquito-control ditch creates waters under Rivers and Harbors Act jurisdiction), rev’d on other grounds, 481 U.S. 412, 414 n. 1, 107 S.Ct. 1831, 1834 n. 1, 95 L.Ed.2d 365 (1987); United States v. DeFelice, 641 F.2d at 1175 (illegal and unauthorized acts of third parties can create Rivers and Harbors Act jurisdiction), cert. denied, 454 U.S. 940, 102 S.Ct. 474, 70 L.Ed.2d 247 (1981); Track 12 Inc. v. District Engineer, U.S. Army Corps of Engineers, 618 F.Supp. 448, 449 (D.Minn.1985) (state and locality construction of highway and sewage system creates Corps jurisdiction). If the Corps’ regulations under Clean Water Act jurisdiction harm a landowner, her appropriate response is to seek damages through inverse condemnation proceedings, not to restrict the scope of Corps jurisdiction. Riverside Bayview Homes, 474 U.S. at 128, 106 S.Ct. at 459.
B. Normal Circumstances
The district court’s second rationale for denying Corps jurisdiction over the southern portions of the property was a Corps regulation that defines wetlands as an area that “under normal circumstances” supports wetland vegetation. 33 C.F.R. § 328.3(b). Although the district court found the requisite wetland conditions, it held that “circumstances in those areas are not ‘normal,’ because the ability to support [wetland] vegetation was caused primarily by the government’s flooding of the wildlife refuge across [the road].” The district court’s interpretation of the “normalcy” requirement is tainted by its holding excluding governmentally created artificial waters from Corps jurisdiction.
The phrase “under normal circumstances” is meant to exclude those areas which are not aquatic, but experience an “abnormal presence of aquatic vegetation.” 42 Fed.Reg. 37128 (1977). According to the district court’s findings, the southern fringes of the parcel are aquatic areas. The fact that these wetlands are man-made does not make them “abnormal.” Whether the wetlands are artificially or naturally created is irrelevant to this determination.
C. Adjacency
We disagree with the district court’s third alternative holding, that this wetland is not adjacent to waters of the United States, as required by 33 C.F.R. § 328.3(a)(7). In reaching this conclusion, the district court again relied on its decision to exclude from consideration any consequences of the backflow through the culverts created by Caltrans and the Fish and Wildlife Service. In the absence of this erroneous holding, the southern portions of the property are adjacent to waters of the [359]*359United States — the water in the culvert, which is directly connected to the Newark Slough.
THE CRYSTALLIZERS AND PITS
The Corps determined that the former crystallizers and calcium chloride pits qualified as “other waters” that were under Corps jurisdiction according to 33 C.F.R. § 328.3(a)(3). That section defines “waters of the United States” to include:
All other waters such as intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds, the use, degradation or destruction of which could affect interstate or foreign commerce....
The district court held that the crystallizers and pits were not described by this section for two reasons. First, because they are artificial structures and the regulation lists only natural formations. Second, the court concluded that the ponding was too temporary to qualify as other waters. The district court also addressed but did not decide the question of whether the property has a sufficient connection to interstate commerce.
A. Artificial vs. Natural Formations
The district court applied the doctrine of ejusdem generis8 to construe the regulations to exclude artificially created waters. The court noted that all the waters listed as “other waters” in section 328.3(a)(3) were naturally created, and concluded that the artificially created crystallizers and calcium chloride pits could not be covered by that section. The ejusdem generis rule of statutory construction is used to illuminate the intent of the drafters; when the rule conflicts with other, clearer indications of intent, its results should be ignored. See Weyerhaeuser S.S. Co. v. United States, 372 U.S. 597, 601, 83 S.Ct. 926, 928, 10 L.Ed.2d 1 (1963); Black’s Law Dictionary, 464 (5th ed. 1979). Reliance on the rule is inappropriate in this ease.
First, the district court’s interpretation conflicts with other parts of the Corps’ regulations which assert that the Corps generally has jurisdiction over man-made waters under both the Clean Water Act and the Rivers and Harbors Act. See 33 C.F.R. §§ 328.5, 329.8. The Corps also defines at least one of the features listed in section 328.3(a)(3) to include artificial waters. See 33 C.F.R. § 323.2(b) (“lake” includes “a standing body of open water created by artificially blocking or restricting the flow of a river, stream or tidal area”). In addition, the Corps’ comments to the final regulations support the power of the Corps to assert jurisdiction over artificially created waters:
[W]e generally do not consider the following waters to be “waters of the United States.” However, the Corps reserves the right on a case-by-case basis to determine that a particular waterbody within these categories of waters is a water of the United States.
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(c) Artificial lakes or ponds created by excavating and/or diking dry land to collect and retain water and which are used exclusively for such purposes as stock watering, irrigation, settling basins, or rice growing.
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(e) Waterfilled depressions created in dry land incidental to construction activity and pits excavated in dry land for the purpose of obtaining fill, sand or gravel unless and until the construction or excavation operation is abandoned and the resulting body of water meets the definitions of waters of the United States (see 33 C.F.R. 328.3(a)).
[360]*36051 Fed.Reg. 41206, 41217 (1986) (emphasis added). These comments show that the Corps intends to exempt from its jurisdiction only those artificially created waters which are currently being used for commercial purposes, and that even those waters are subject to such jurisdiction on a “case-by-case” basis of review. The crys-tallizers and calcium chloride pits have not been used for commercial purposes for decades and so are not subject to even this limited exemption. Finally, courts have uniformly included artificially created waters in the Corps’ jurisdiction under the Clean Water Act and the Rivers and Harbors Act. See, e.g., Tull, 769 F.2d 182 (mosquito-control ditch); Stoeco Dev. Ltd. v. Dept. of the Army Corps of Eng’rs, 701 F.Supp. 1075, 1078 (D.N.J.1988) (artificially created wetland), appeal dismissed, 879 F.2d 860 (3rd Cir.1989); United States v. Akers, 651 F.Supp. 320 (E.D.Cal.1987) (same); Track 12, 618 F.Supp. 448 (same); United States v. Ciampitti, 583 F.Supp. 483 (D.N.J.1984) (same), affirmed, 772 F.2d 893 (3rd Cir.1985), cert. denied, 475 U.S. 1014, 106 S.Ct. 1192, 89 L.Ed.2d 307 (1986). We reject the district court’s interpretation of the regulations as creating a distinction between artificial and natural waters.
B. Temporary Water Formations
The district court also held that the crystallizers and calcium chloride pits were not other waters because they “are in fact dry most of the year.” Due to the climate in the Bay Area, ponding only occurs during the winter rainy season. The seasonal nature of the ponding is no obstacle to Corps jurisdiction however, because the regulations specifically enumerate two seasonal water features as other waters: intermittent streams and playa lakes. See Quivira Mining Co. v. EPA, 765 F.2d 126, 130 (10th Cir.1985), cert. denied, 474 U.S. 1055, 106 S.Ct. 791, 88 L.Ed.2d 769 (1986); United States v. Phelps Dodge Corp., 391 F.Supp. 1181, 1187 (D.Ariz.1975).
The Corps’ determination that the crys-tallizers and calcium chloride pits are similarly seasonal bodies of water within the meaning of the regulations is proper. We reverse the district court’s contrary conclusion.
C. Interstate Commerce
The crystallizers and pits must still have sufficient connections to interstate commerce to come under the Corps’ jurisdiction as “other waters.” 33 C.F.R. § 328.3(a)(3). The Corps has adopted the following EPA criteria to determine when waters have sufficient ties to interstate commerce:
[Waters]
a. Which are or would be used as habitat by birds protected by Migratory Bird Treaties; or
b. Which are or would be used as habitat by other migratory birds which cross state lines; or
c. Which are or would be used as habitat for endangered species....
51 Fed.Reg. 41206, 41217. The district court failed to determine whether the crys-tallizers and pits meet these standards. The record showed however, that migratory birds (including many protected by Migratory Bird Treaties) and one endangered species may have used the property as habitat. The commerce clause power, and thus the Clean Water Act, is broad enough to extend the Corps’ jurisdiction to local waters which may provide habitat to migratory birds and endangered species. See Utah v. Marsh, 740 F.2d 799, 804 (10th Cir.1984); Palila v. Hawaii Dep’t of Land and Natural Resources, 471 F.Supp. 985, 991-95 (D.Haw.1979), aff'd, 639 F.2d 495 (9th Cir.1981). See generally Hughes v. Oklahoma, 441 U.S. 322, 329-36, 99 S.Ct. 1727, 1732-36, 60 L.Ed.2d 250 (1979). We remand this issue to the district court to determine if the property has the requisite connections to interstate commerce.
CONCLUSION
The southern portions of Leslie’s property meet both the statutory and regulatory requirements for the Corps to exert Clean Water Act jurisdiction over them. The fact that the government in part caused the inundation of the property is not of consequence. Similarly, the government’s ac[361]*361tions do not affect the normalcy or adjacency requirements of the regulations. As to the crystallizers and calcium chloride pits, their artificiality and temporary wetness pose no obstacle to Corps jurisdiction. We remand to the district court for a factual determination of the sufficiency of the property’s connections to interstate commerce. Because the record reflects that the Corps’ jurisdiction does not extend to the total property, we also remand to determine over which portion of the property the Corps has valid jurisdiction in light of this opinion’s legal conclusions. Costs will abide the final determination.
REVERSED and REMANDED.