Two large sphagnum bogs, Grass Lake and Osgood Swamp are located in the watershed and both are considered to be Significant Natural Areas by the California Department of Fish and Game (CDFG). Grass Lake has been designated a U.S. Forest Service Research Natural Area. The headwaters are in Desolation Wilderness and in roadless areas managed for quasi-wilderness uses by the U.S. Forest Service.
Two significant peatlands, Grass Lake and Osgood Swamp, are located within the watershed and both are regarded as Important Natural Areas by the California Department of Fish and Game (CDFG). Grass Lake has been designated a U.S. Forest Service Research Natural Area. The source areas lie in Desolation Wilderness and in regions managed for conservation purposes by the U.S. Forest Service.