The Middle Pearl Silver Watershed (HUC 03180003) covers an area of approximately 1,274 square miles in Nevada. The watershed is primarily composed of high mountains, rugged canyons, and desert basins. The hydrology of the watershed is characterized by high peaks and deep valleys that contribute to the formation of the Middle Fork of the Humboldt River. The watershed receives a significant amount of snowfall during the winter months, which contributes to the unique snowpack composition. The surface water in the watershed is largely impacted by mining activities, which have led to elevated levels of heavy metals in the rivers and streams. There are several reservoirs in the watershed, including the South Fork Reservoir and Rye Patch Reservoir, which provide water for irrigation and recreation. Interesting climatic facts include the high variability of precipitation and temperature, which have led to fluctuations in snowpack and water availability. There is also evidence of long-term climate change impacts on the watershed, including decreased snowpack and increased drought frequency.