The Alamo River is a river flows north from the Mexicali Valley (Baja California) across Imperial Valley (California), finally it drains into the Salton Sea.
The creation of the New River, Alamo River, and Salton Sea of today started in the autumn of 1904, when heavy rainfall and snowmelt caused the Colorado River to swell and breach an Imperial Valley dike. The sudden influx of water and the lack of any drainage from the basin resulted in the formation of the Salton Sea; the rivers had re-created a great inland sea in an area that it had frequently inundated before, the Salton Sink. It took nearly two years to control the Colorado River’s flow and stop the flooding, but it was effectively dammed in the early part of 1907 and returned to its normal course. The Alamo and New Rivers continued to flow, but at a lesser rate.
In most places, the river is a vegetation-choked ravine with a small watercourse at the bottom.