There are a number of reasons some modes of travel are restricted within National Forests. These are not always well understood, particularly if encountered unexpectedly. These areas are sensitive and often include winter ranges, calving grounds, or security areas. These same areas are often open to vehicle use during other times of the year when big game are less likely to be disturbed. This reduces erosion and the amount of sediment that can be transported to streams.
Sediment is a serious threat to spawning and rearing grounds for steelhead, salmon, and other fish.
In some specific instances, certain types of travel are prohibited to ensure user safety. Even so, caution should be used on every Forest route. One goal on the Gifford Pinchot National Forest is to provide a broad range of recreation settings and opportunities. Some areas of the Forest are designated for nonmotorized recreation to achieve a balance a balance with motorized recreation opportunities.