The San Carlos Watershed (HUC 15040007) covers an area of approximately 1,722 square miles in southeastern Arizona. The hydrology of the area is characterized by intermittent streams and rivers that flow into the Gila River. The region also experiences a significant snowpack during the winter months, which contributes to surface water runoff during the spring and summer. The watershed contains several reservoirs, including San Carlos Lake, which is a critical source of water for local communities and agricultural production. Interesting climatic facts and trends in the area include the increasing frequency and intensity of droughts, which have led to declining water levels in the reservoirs and increased pressure on water resources. Additionally, the region experiences significant seasonal variations in temperature, with hot summers and mild winters. The watershed is also home to a diverse array of plant and animal species, including several endangered and threatened species.