McCoy, Michael ; Stoner, Mary Alice. 1992. Crib Walls for Mountain Bike Trails. 9223 2336. Missoula, MT: U.S. Department of Agriculture, Forest Service, Missoula Technology and Development Center.
Mountain bike use on National Forest trails has risen dramatically over the past decade. As a result, there has been an increased impact on resources, especially at switchback turns. The use of cribbing (a timber wall built with 4 x 4s) reduces resource impacts on switchbacks by stabilizing the soil and preventing bicyclists from cutting corners. The technique for building a crib wall described in this report was developed by the Los Padres National Forest in the Pacific Southwest Region.