The Greys Hobock watershed (HUC 17040103) covers an area of approximately 68 square miles in north-central Colorado. The watershed is fed by snowmelt and precipitation, with snowpack playing a significant role in the hydrology of the area. The surface water in the watershed includes several small streams and the Dillon Reservoir, which provides water for drinking, irrigation, and recreation. The reservoir includes constituents such as nitrogen and phosphorus, which can contribute to harmful algal blooms. In recent years, the region has experienced warmer temperatures and less snowpack, leading to concerns about water scarcity and potential impacts on wildlife and recreational activities. However, the area also experiences unique climatic phenomena such as chinook winds, which can cause rapid temperature increases and melting of snowpack. Overall, the Greys Hobock watershed is an important source of water for the region, and ongoing monitoring is needed to ensure its sustainability.