The Lower Cimarron Watershed (HUC 11050003) covers a land area of approximately 4,227 square miles and is located in Oklahoma and Kansas. The watershed receives an average of 22 inches of precipitation annually, with the majority falling in the spring and summer months. The watershed is hydrologically complex with a mix of ephemeral, intermittent, and perennial streams. The area experiences extreme weather conditions with high temperatures in the summer and cold winters. The watershed is home to a number of reservoirs, including the Optima Lake and the Canton Lake, which are used for irrigation, recreation, and water supply. The snowpack in the area is generally low, with most snowfall occurring in the northern part of the watershed. The climate in the watershed has been changing, with increasing temperatures, more intense precipitation events, and longer droughts.