Brock Reservoir, reservoir near Gordons Well, Imperial County, California, United States

Brock Reservoir is an artificial reservoir near Gordons Well, California, covering about 485 acres in two basins. The basins are enclosed by earthen berms lined with polyethylene and topped with a 10-inch layer of soil cement. A 6.5-mile inlet channel links it to the All-American Canal, and a 0.25-mile canal and siphon system returns water to the canal for farmers.

Brock Reservoir was approved in 2008 and finished in October 2010, following the 2007 drought-management plan adopted by the seven Colorado River states. It is named after Imperial Valley farmer and researcher Warren H. Brock. The $172 million project was funded mainly by the Southern Nevada Water Authority ($115 million), with the Central Arizona Project and Metropolitan Water District of Southern California contributing $28.6 million each.

Brock Reservoir is not a visitor site: it is an operating water facility run remotely by the Imperial Irrigation District, with no public access to the basins. The inlet channel runs 6.5 miles (10.5 km) from the All-American Canal, and a 0.25-mile canal and siphon system returns water to the canal. The reservoir is filled and emptied many times a year, so water levels change constantly.

Brock Reservoir is named after Warren H. Brock, an Imperial Valley farmer and agriculture researcher. It is operated remotely by the Imperial Irrigation District, which opens and closes the inlet and outlet gates to control how much water is diverted from the All-American Canal and returned to it.