The Rio San Jose watershed covers an area of approximately 821 square miles in northern New Mexico. The majority of its hydrology is based on snowmelt, which contributes to the surface water and reservoir constituents in the area. The watershed includes the Pecos Wilderness Area and the Pecos River, which is a popular destination for outdoor recreational activities such as fishing and hiking. The snowpack in the area varies from year to year, with recent trends showing a decline in snow accumulation due to changing climatic conditions. There have been increases in both average temperature and precipitation over the past few decades, which has led to changes in the timing and amount of snowmelt. Overall, the Rio San Jose watershed is an important resource for the surrounding communities and an area of ecological significance.