of the weirs at the proposed site were described and assessed in a report prepared by Ayres Associates, a consulting firm. As indicated above, the Corps incorporated the Pioneer EA and referenced the Ayres report in its decision document and approved construction of the weirs with the condition that Canyon Club receive advance approval of the final plans before construction begins.


56
While the EPA raised general concerns about the impact of the weirs and the U.S. Forest Service geomorphologist criticized aspects of the Ayres report, we do not believe these comments obligated the Corps to evaluate the impact of the weirs further in an EIS. Neither comment provides "evidence ... [that] casts serious doubt upon the reasonableness of [the Corps'] conclusions." Nat'l Parks & Conservation Ass'n v. Babbitt, 241of a five-lane highway over a six-block distance and the failure of the agency involved to consider any alternative location for this new road, or any modification to the project design that had potential to mediate its impact. Id. at 1119-20. We ruled that this failure was arbitrary in light of what we discerned was the project's "general overarching objective of improving traffic flow in the area," in addition to record evidence suggesting two viable alternative locations. Id. at 1119.


66
Here, in contrast, the record indicates that, by the time the Corps' EA was prepared, Canyon Club and the Corps had seriously considered various alternatives. As described above, the 286-acre proposal was originally the preferred alternative. As a result of "facilitation meetings with members of the public who had