The St. Vrain Watershed is located in north-central Colorado and covers an area of approximately 1,152 square miles. The watershed is characterized by a high elevation and mountainous terrain, with the St. Vrain River flowing through its center. The hydrology of the watershed is heavily influenced by snowpack, with most of the precipitation falling as snow during the winter months. The snowpack provides an important source of surface water for the watershed during the spring and summer months. The watershed contains several reservoirs, including Button Rock Reservoir, which is used for drinking water supply. Interesting climatic facts about the St. Vrain Watershed include its susceptibility to flash floods and severe weather events, such as the 2013 Colorado floods. Climate change is also expected to have significant impacts on the watershed, including changes in snowpack patterns and increased risk of drought.