ally outfitted river trips[.]” Id. at 87. The Park Service explained that “continued authorization of motorized use for
recreational river trips in the [Park] is essential … to meeting the … management objectives” for the 2006 Manage-
sions Act. It is true that the FEIS and ROD do not contain a specific discussion of the amount of motorized traffic
found necessary and appropriate for public use and enjoyment of the Corridor. But the absence of such a specific
discussion does not necessarily require the agency’s action to be overturned. “While [a court] may not supply a rea–
soned basis for the agency’s action that the agency itself has not given, [the court] will uphold a decision of less than
ideal clarity if the agency’s path may reasonably be discerned.” Bowman Transp., Inc. v. Arkansas–Best Freight Sys.,
tinue to allocate 113,083 user days to commercial operators (74,260 motorized and 38,823 non-motorized) and
58,048 user days to non-commercial users. FEIS Vol. I at 45. Alternative B would have eliminated all motorized
traffic on the river and allocated 97,694 user days to commercial operators and 74,523 to non-commercial. Id. at 47.
Alternative C also would have eliminated all motorized trips, but would have increased commercial user days to
166,814 and non-commercial to 115,783, presumably to accommodate sufficient numbers of visitors with the slower
bers of passengers, and helicopter exchanges at the Whitmore helipad. Id. at 61. The Park Service evaluated these
alternatives against environmental, social, and park-management factors including impacts on soils, water, air,
soundscape, caves, vegetation, terrestrial life, aquatic resources, special status species, cultural resources, visitor
experience, socio-economic resources, park management and operations, adjacent lands, and wilderness character.
Id. at 61-65.
after considering all factors and variables, selected Modified Alternative H. That Alternative included specific allo-
cations for motorized and non-motorized uses: a total of 115,500 commercial user days consisting of 76,913 motor-
ized and 38,587 non-motorized, and an estimated 113,486 non-commercial user days. FEIS Vol. I at 60.
Modified Alternative H reduced the amount of motorized traffic in the Colorado River Corridor and the months