1. Civil Engineer, U.S. Forest Service, Lolo National Forest, Building 24, Fort Missoula, Missoula, MT 59804-7297.
2. Associate Professor, Dept. of Civil and Architectural Engineering, Univ. of Wyoming, 1000 E. Univ. Ave., Laramie, WY 82071 (corresponding author).
3. Professor, Ecosystem Science and Management, Univ. of Wyoming, 1000 E. Univ. Ave., Laramie, WY 82071.