The Lower Crab Watershed (HUC 17020015) covers an area of approximately 63 square miles in central Idaho. The area is dominated by steep mountains and rugged terrain, with elevations ranging from 3,000 to over 9,000 feet. The watershed is fed by snowpack, which accumulates during the winter months and melts during the spring and summer, providing the majority of surface water in the area. The watershed is home to several reservoirs, including the Anderson Ranch Reservoir, which contains high levels of sediment and nutrients due to erosion from the surrounding hillsides. Climate trends in the area include increasing temperatures and decreasing snowpack, which could have significant impacts on water availability and management in the future. Overall, the Lower Crab Watershed is an important source of water for both human and wildlife populations in the region.