OPINION
MATTHEWS, Senior Justice.
I. INTRODUCTION
The Department of Natural Resources restricted the non-winter use of large vehicles on the Rex Trail. The main question in this case is whether these restrictions are within the Department's authority. Because the Department has broad authority to manage public lands in general and specific authority to manage rights-of-way such as the Rex Trail, and the restrictions do not violate any statutory limitations on this authority, we conclude that they are authorized.
II. FACTS AND PROCEEDINGS
A. Facts
The Rex Trail is a route extending some 50 miles between the Parks Highway and the Wood River north of the Alaska Range. Except for a portion about one-and-a-half miles in length nearest the Parks Highway the trail has not been improved. The trail almost exclusively crosses state and federal land. It was established in the early twentieth century as a transportation route to mining claims, and in light of its historic use, the Alaska Legislature has recognized it as an R.S. 2477 right-of way.1 In the 1970s the trail was used for access to remote parcels that were made available for sale by the State. The trail has also traditionally been used by hunters to gain access to productive moose habitat. In 2004 the Board of Game legalized antlerless moose hunts on lands adjacent to the trail. The amount of traffic on the trail increased substantially due to this hunt. Many different types of vehicles use the Rex Trail including light 3- and 4-wheel all-terrain vehicles (ATVs) as well as heavier, large-tired and tracked vehicles.
In 2007 the State Department of Natural Resources (DNR) received numerous complaints about the deteriorating condition of the trail. DNR personnel inspected the trail several times and determined that vehicular use of the trail was causing extensive rutting, with some ruts as deep as four feet. They noted that in some places the trail had essentially become a long channel filled with water. In order to avoid ruts, vehicles would create new paths along the trail. These new paths would themselves become rutted resulting in a continual process of widening and degradation. The DNR observers concluded [747]*747that the rutting of the trail made travel for ATVs and snowmachines both dangerous and difficult. They also noted that the trail conditions were much worse than when they had checked the same route in the winter of 2002.
B. Proceedings
In May 2008 DNR's northern region manager issued a decision restricting vehicles weighing more than 1,500 pounds from using the Rex Trail every year from April 15 to October 31. The stated goals of the restrictions were "to slow the degradation of access conditions, reduce the risks to public safety during trail travel, and to reduce the potential for more significant resource damage." The restrictions did not include the 1.5 miles of the trail nearest the Parks Highway that have been hardened for general vehicle use. As grounds for the decision, DNR indicated that heavy-vehicle use during the summer was particularly damaging:
In its current unimproved state, the Rex Trail is most suitable for safe, reliable travel and most resistant to damage in winter, when frozen conditions and snow cover stabilize and protect wet, permafrost-underlain soils. Traditionally, summer motorized use by standard ATVs has not been reliable for continuous access from the highway to Wood River (due to presence of wetlands and river crossings), but was possible in dry years/seasons, and certainly possible in discontinuous sections of the trail.
In response to public reports of intense seasonal motorized use, increased travel with large off-road vehicles (such as Nod-wells and large-tired "moose buggies") and degrading travel conditions on the eastern Rex Trail, DNR conducted an evaluation of information including DNR field work (a preliminary trail condition assessment), land records, current statutes and regulations, scientific studies, varying public reports and concerns, data from other agencies, and possible trail management options. The report documenting this preliminary evaluation (attached to this decision) noted that the type and intensity of motorized use of the eastern Rex [TJrail has changed in recent years, that travel conditions on the trail are deteriorating due to seasonal rutting and thermal degradation, and that public resources are being damaged and wasted due to off-trail travel. The report also noted that the resource damage which contributes to deteriorating travel conditions cannot be attributed to a single operator or vehicle type-impacts are cumulative, and public interpretations of "damage" vary. Certain conditions on the trail and nearby lands observed this fall and winter, however, are unquestionably due to the operation of wheeled and tracked vehicles larger than standard ATVs or snowmachines. Ruts in excess of 3 feet deep with tracks too wide for an ATV or snowmachine to span, and wide swaths of downed trees left in newly-created trails originating from the Rex represent forms of travel disruption and resource damage above and beyond what is possible for traditional off-road vehicles. The poor trail conditions interfere with traditional travel both in summer (which has always been variable, depending on wet or dry years) and in winter, which has traditionally been very reliable. Most of the summer large equipment use has occurred without DNR permitting, in violation of current regulations. The report listed several options for both short-and long-term management; this decision is based on the most feasible short-term management option evaluated, given the available information.
Robert Caywood and numerous other trail US°"8 (Caywood) appealed this decision to the DNR commissioner. The commissioner de-Mied the appeals on August 27, 2009.
Meanwhile, on August 25, 2009, the northern region manager amended the restrictions to allow tracked vehicles heavier than 1,500 pounds to use the trail on an individual permit basis. This modification was made "so that DNR can monitor impacts of this additional use." DNR explained that "[the goal [748]*748of the monitoring program will be to gather trail travel conditions, use and impact data, and to evaluate the usefulness of the program for making future management decisions."
Caywood also appealed the amended decision to the commissioner, who again denied the appeal. Caywood then appealed both decisions to the superior court. The superior court affirmed the commissioner, and Cay-wood now brings the appeal to this court.
III. STANDARD OF REVIEW
Where the superior court has acted as an intermediate appellate court reviewing an agency decision, we review the agency decision directly.3
The questions in this case are whether the restrictions imposed on the use of the trail are (1) authorized by statute and (2) arbitrary or unreasonable. The first question is a question of law to which we apply our own independent judgment without affording significant deference to the agency's decision.4 The second question involves a discretionary decision of the agency. We review it deferentially, asking primarily whether the agency has taken a hard look at the problem under review and has engaged in reasoned decision making.5
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OPINION
MATTHEWS, Senior Justice.
I. INTRODUCTION
The Department of Natural Resources restricted the non-winter use of large vehicles on the Rex Trail. The main question in this case is whether these restrictions are within the Department's authority. Because the Department has broad authority to manage public lands in general and specific authority to manage rights-of-way such as the Rex Trail, and the restrictions do not violate any statutory limitations on this authority, we conclude that they are authorized.
II. FACTS AND PROCEEDINGS
A. Facts
The Rex Trail is a route extending some 50 miles between the Parks Highway and the Wood River north of the Alaska Range. Except for a portion about one-and-a-half miles in length nearest the Parks Highway the trail has not been improved. The trail almost exclusively crosses state and federal land. It was established in the early twentieth century as a transportation route to mining claims, and in light of its historic use, the Alaska Legislature has recognized it as an R.S. 2477 right-of way.1 In the 1970s the trail was used for access to remote parcels that were made available for sale by the State. The trail has also traditionally been used by hunters to gain access to productive moose habitat. In 2004 the Board of Game legalized antlerless moose hunts on lands adjacent to the trail. The amount of traffic on the trail increased substantially due to this hunt. Many different types of vehicles use the Rex Trail including light 3- and 4-wheel all-terrain vehicles (ATVs) as well as heavier, large-tired and tracked vehicles.
In 2007 the State Department of Natural Resources (DNR) received numerous complaints about the deteriorating condition of the trail. DNR personnel inspected the trail several times and determined that vehicular use of the trail was causing extensive rutting, with some ruts as deep as four feet. They noted that in some places the trail had essentially become a long channel filled with water. In order to avoid ruts, vehicles would create new paths along the trail. These new paths would themselves become rutted resulting in a continual process of widening and degradation. The DNR observers concluded [747]*747that the rutting of the trail made travel for ATVs and snowmachines both dangerous and difficult. They also noted that the trail conditions were much worse than when they had checked the same route in the winter of 2002.
B. Proceedings
In May 2008 DNR's northern region manager issued a decision restricting vehicles weighing more than 1,500 pounds from using the Rex Trail every year from April 15 to October 31. The stated goals of the restrictions were "to slow the degradation of access conditions, reduce the risks to public safety during trail travel, and to reduce the potential for more significant resource damage." The restrictions did not include the 1.5 miles of the trail nearest the Parks Highway that have been hardened for general vehicle use. As grounds for the decision, DNR indicated that heavy-vehicle use during the summer was particularly damaging:
In its current unimproved state, the Rex Trail is most suitable for safe, reliable travel and most resistant to damage in winter, when frozen conditions and snow cover stabilize and protect wet, permafrost-underlain soils. Traditionally, summer motorized use by standard ATVs has not been reliable for continuous access from the highway to Wood River (due to presence of wetlands and river crossings), but was possible in dry years/seasons, and certainly possible in discontinuous sections of the trail.
In response to public reports of intense seasonal motorized use, increased travel with large off-road vehicles (such as Nod-wells and large-tired "moose buggies") and degrading travel conditions on the eastern Rex Trail, DNR conducted an evaluation of information including DNR field work (a preliminary trail condition assessment), land records, current statutes and regulations, scientific studies, varying public reports and concerns, data from other agencies, and possible trail management options. The report documenting this preliminary evaluation (attached to this decision) noted that the type and intensity of motorized use of the eastern Rex [TJrail has changed in recent years, that travel conditions on the trail are deteriorating due to seasonal rutting and thermal degradation, and that public resources are being damaged and wasted due to off-trail travel. The report also noted that the resource damage which contributes to deteriorating travel conditions cannot be attributed to a single operator or vehicle type-impacts are cumulative, and public interpretations of "damage" vary. Certain conditions on the trail and nearby lands observed this fall and winter, however, are unquestionably due to the operation of wheeled and tracked vehicles larger than standard ATVs or snowmachines. Ruts in excess of 3 feet deep with tracks too wide for an ATV or snowmachine to span, and wide swaths of downed trees left in newly-created trails originating from the Rex represent forms of travel disruption and resource damage above and beyond what is possible for traditional off-road vehicles. The poor trail conditions interfere with traditional travel both in summer (which has always been variable, depending on wet or dry years) and in winter, which has traditionally been very reliable. Most of the summer large equipment use has occurred without DNR permitting, in violation of current regulations. The report listed several options for both short-and long-term management; this decision is based on the most feasible short-term management option evaluated, given the available information.
Robert Caywood and numerous other trail US°"8 (Caywood) appealed this decision to the DNR commissioner. The commissioner de-Mied the appeals on August 27, 2009.
Meanwhile, on August 25, 2009, the northern region manager amended the restrictions to allow tracked vehicles heavier than 1,500 pounds to use the trail on an individual permit basis. This modification was made "so that DNR can monitor impacts of this additional use." DNR explained that "[the goal [748]*748of the monitoring program will be to gather trail travel conditions, use and impact data, and to evaluate the usefulness of the program for making future management decisions."
Caywood also appealed the amended decision to the commissioner, who again denied the appeal. Caywood then appealed both decisions to the superior court. The superior court affirmed the commissioner, and Cay-wood now brings the appeal to this court.
III. STANDARD OF REVIEW
Where the superior court has acted as an intermediate appellate court reviewing an agency decision, we review the agency decision directly.3
The questions in this case are whether the restrictions imposed on the use of the trail are (1) authorized by statute and (2) arbitrary or unreasonable. The first question is a question of law to which we apply our own independent judgment without affording significant deference to the agency's decision.4 The second question involves a discretionary decision of the agency. We review it deferentially, asking primarily whether the agency has taken a hard look at the problem under review and has engaged in reasoned decision making.5
IV. DISCUSSION
A. Statutory And Regulatory Background
Under the Alaska Land Act, the Department of Natural Resources is charged with administering state lands.6 Within the Department, the Division of Mining, Land and Water bears this responsibility.7 Specifically, the director of the Division of Mining, Land and Water has the delegated authority to manage and control state lands.8
Under AS R.S. 2477 rights-of-way such as the Rex Trail are "available for use by the public under regulations adopted by the Department of Natural Resources. ..."9 One such regulation is 11 Alaska Administrative Code (AAC) 51.100, which vests the commissioner with management authority and permits the commissioner to restrict right-of way uses in order to protect public safety, the right-of-way, and the servient estate.10
The statute primarily in controversy in this case is AS 38.04.058 which provides:
The commissioner may, under terms agreed to in writing by a grantee, lessee, or interest holder of state land, restrict the use of an easement or right-of-way reserved under AS 38.04.050, 38.04.055, or other law in order to protect public safety or property. The commissioner may not agree to or enforce a restriction under this [749]*749section unless the restriction is narrowly 'tailored to achieve the protection of public safety and property while preserving access to the maximum extent practicable and the commissioner makes a written finding identifying how the restriction will protect public safety and public or private property.
The text of the statutes to which section 058 refers, AS 88.04.050 and AS 38.04.055, is set forth in the margin.11
Alaska Statute 38.04.200 limits the authority of the commissioner of the Department of Natural Resources to restrict traditional means of access for the purpose of protecting "aesthetic values" except under certain conditions and for certain purposes.12
Regulation 11 AAC 96.020, in effect since 1970, defines generally allowed uses of state land that may be engaged in without a permit. These include using a highway vehicle with a curb weight of up to 10,000 pounds and using a recreational off-road or all-terrain vehicle with a curb weight of up to 1,500 pounds.13
[750]*750B. The Restrictions Are Authorized By Law.
The northern region manager relied on AS 38.04.058 and 11 AAC 51.100 as the authority for the initial restrictions. The commissioner's decision of August 27, 2009 relied on the same statutory section and regulation.
In his brief before us, Caywood's primary focus is on AS 38.04.058. He contends that this statute only applies where a grantee, lessee, or interest holder of state land is involved, and only then when the grantee, lessee, or interest holder agrees in writing with the restrictions imposed by DNR. He argues:
Reasonable application of this statute would be applying it to situations where the State enters into a mineral lease and both the lessee and the State agree to certain restrictions on an easement running through the leasehold interest because it would be unsafe for the public to cross the area in light of the use of heavy equipment, explosives or strip mining on the leasehold.
Such limited applications, Caywood argues, bear no resemblance to the restrictions imposed on the 50-mile-long Rex Trail; therefore section .058 does not authorize the Rex Trail restrictions.
We agree that section .058 is a statute of limited application.14 It does not apply to this case because, among other reasons, the restrictions here were not mutually agreed upon between the commissioner and interested grantees, lessees, or interest holders. We thus agree that section .058 does not supply authority to restrict the use of the Rex Trail.
But our conclusion that the restrictions on the Rex Trail could not be based on section 058 does not mean that the restrictions are not authorized. They clearly are authorized under 11 AAC 51.100(a). This regulation, as noted above, was promulgated under AS 19.30.400(a). It recognizes the commissioner's management authority over RS. 2477 rights-of-way. Specifically, the commissioner is authorized to restrict right-of-way uses as necessary to promote public safety, or to protect the right-of-way or the servient estate from damage caused by use during thawing conditions. In this case the written decision of the DNR northern region manager, ratified by the commissioner's decisions on appeal, indicates that these conditions have been satisfied.
In addition, insofar as the right-of-way erosses state land and also because it is a state-owned interest in land, the general management authority delegated to the Division of Mining, Land and Water under AS 38.05.035(a)(2) serves as authority for the restrictions. In its brief on appeal before this court the State has relied on section .085(a)(2), and other related provisions of the Alaska Land Act, arguing that the management of trails across state land falls under the general statutory duties and powers of DNR. We agree. We also note that even [751]*751though DNR's general management authority was not relied upon by the agency in imposing the restrictions such authority nonetheless can serve as a basis for affirming the agency.15
C. The Restrictions Are Not Arbitrary Or Unreasonable.
Caywood acknowledges that AS 38.04.200 permits restricting traditional means of access for the protection of public safety and property, but he argues that the protection of public safety and property rationale in this case is merely a ruse and the restrictions are "not supported by substantial evidence of restrictions necessary for public safety or protection of property."
The State responds to Caywood's reliance on AS 38.04.200 on a number of grounds. One is that the statute only applies to restrictions on access imposed to protect aesthetic values and the restrictions here were not imposed for this purpose. "Aesthetic values" in section .200 are defined to mean "those values that exist as an expression of the social or cultural viewpoint held by a portion The State contends of the population." 16 that the restrictions on the Rex Trail were imposed for the purpose of protection of public safety and public property and that these purposes do not fall within the meaning of aesthetic values under the statute.
We agree with the State on this point. Further, even if restrictions to protect public safety and property could also be categorized as for the protection of aesthetic values, subsection (a)(8) of section .200 excepts restrictions for the purpose of protecting public safety and property from the coverage of the act.
Caywood's point that the restrictions are not supported by substantial evidence misconceives the substantial evidence standard. We review administrative adjudications to determine whether they are supported by substantial evidence.17 Policy decisions such as whether to impose restrictions on the use of state land are reviewed under the deferential reasonable basis test.18 Under this test we ask whether the decision is reasonable and not arbitrary.19 In making this determination courts may not "substitute their judgment for the judgment of the agency."20 Rather "review consists primarily of ensuring that the agency has taken a hard look at the salient problems and has genuinely engaged in reasoned decision making.21
We consider Caywood's argument that the restrictions are not based on substantial evidence to raise the question of whether the restrictions are reasonable and not arbitrary. The question is easily answered. The record amply supports the agency's decision that deep rutting along the Rex Trail presents a safety hazard, especially in winter to travelers on snowmachines. There is also record support for the conclusion that heavy vehicles are responsible for the worst of the rutting along the Rex Trail and that the resulting level of degradation is unacceptable. Further, the record reflects that DNR has given considerable attention and study to the question of whether restrictions should be imposed on the use of the Rex Trail and if so what they should be. The agency there[752]*752fore has satisfied the "hard look" and reasoned decision-making requirements of the reasonable basis standard.
v. CONCLUSION
For these reasons the judgment of the superior court affirming the decisions of the Department of Natural Resources is AP-FIRMED.
2. State of Alaska, Department of Natural Resources, Division of Mining, Land and Water, Northern Region, Administrative Decision, Rex Trail-RST 119, ADL 412566, ADL 401880 (May 12, 2008).