The Upper Green Slate Watershed, located in southwestern Wyoming, covers an area of 623 square miles. The watershed is characterized by high elevation mountainous terrain and is home to the headwaters of the Green River. The hydrology of the watershed is dominated by snowmelt, with snowpack typically peaking in April and May. Surface water runoff feeds into numerous small streams and tributaries that eventually flow into the Green River. The reservoirs in the watershed are used primarily for irrigation and are not used for drinking water. Climatic trends in the region show an increase in temperature and a decrease in snowpack over the past few decades, leading to concerns about water availability and ecological impacts. The watershed is also home to numerous wildlife species, including elk, moose, and bighorn sheep.