San Simon River (Arizona)

The San Simon River is an ephemeral stream located in southeastern Arizona. It flows intermittently, primarily during periods of heavy rainfall or snowmelt in the surrounding mountains. Its watershed is primarily located within Cochise County.

The river's flow generally trends northward, eventually contributing to the larger Gila River basin. The landscape through which it flows is characterized by arid and semi-arid conditions, featuring desert scrub vegetation and sparse grasslands.

Historically, the San Simon River and its associated floodplain supported agricultural activities, though water availability has always been a limiting factor. The river's name likely derives from early Spanish settlements in the area, and the region has a history of ranching and mining.

The San Simon River is susceptible to flash flooding due to the rapid runoff from the surrounding terrain following intense precipitation events. The river is an important, though limited, source of water for local wildlife and riparian vegetation when water is present. Studies of the river's hydrology and ecological function are limited.