The Shoal Watershed, located in north-central Idaho, covers an area of approximately 568 square miles. The hydrology of the watershed is dominated by the South Fork Clearwater River, which flows through the area and provides a significant source of surface water. The watershed experiences significant snowpack accumulation during the winter months, which contributes to the water supply during the drier summer season. Surface water in the watershed contains a variety of constituents, including sediment, nutrients, and dissolved minerals. The reservoirs within the watershed are used for irrigation, flood control, and recreation. The region experiences a Mediterranean climate, characterized by hot, dry summers and cool, moist winters. Recent trends suggest that the area is experiencing warmer temperatures and a decrease in snowpack accumulation, which could have significant implications for the water supply and hydrology of the region.