East Park Dam is an agricultural irrigation dam and reservoir built by the

United States Bureau of Reclamation The Bureau of Reclamation, formerly the United States Reclamation Service, is a federal agency under the U.S. Department of the Interior, which oversees water resource management, specifically as it applies to the oversight and operatio ...

, on Little Stony Creek, about southwest of

Orland, California Orland is a city in Glenn County, California. The population was 8,298 at the 2020 census, up from 7,291 at the 2010 census, making Orland the most populous city in Glenn County. Orland is located north of Willows, at an elevation of . Interst ...

on the northern end of the

California Central Valley The Central Valley is a broad, elongated, flat valley that dominates the interior of California, United States. It is wide and runs approximately from north-northwest to south-southeast, inland from and parallel to the Pacific coast. It cover ...

. The dam was completed in . Its main structure is a curved, thick-arch concrete gravity dam, high, with two sluice gates. The control house is in the shape of a pagoda, and the

spillway A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure tha ...

, about south of the dam on the western side of the reservoir, features an eccentric set of curved labyrinth-spillway fins. The reservoir has a storage capacity of . The

California Office of Environmental Health Hazard Assessment The Office of Environmental Health Hazard Assessment, commonly referred to as OEHHA (pronounced oh-EEE-ha), is a specialized department within the cabinet-level California Environmental Protection Agency (CalEPA) with responsibility for evaluati ...

(OEHHA) has developed an advisory for the East Park Reservoir based on mercury and PCBs found in fish caught from this water body. Th
advisory
provides safe eating advice for species caught in the body of water.

The Orland Project

The East Park dam and reservoir was one element of the Orland Project in the area, one of the earliest, and one of the smallest, ever undertaken by the Bureau.http://www.usbr.gov/projects/Project.jsp?proj_Name=Orland+Project Other components of the project include: * the 1928

Stony Gorge Dam Stony Gorge Dam (National ID # CA10194) is a dam in Glenn County, California. The concrete buttress dam was constructed between and by the United States Bureau of Reclamation, with a height of and long at its crest. Structurally it is a rel ...

and Reservoir, on Stony Creek about 18 miles downstream from East Park Dam, an early example of an Ambursen-type dam * the 1914 Rainbow Diversion Dam * the 1913 Northside Diversion Dam, rebuilt in the 1950s * and a canal and distribution system with 17 miles of canals and 117 miles of lateral connections Still functioning, the local Orland Unit Water Users' Association has operated the project since October 1, 1954. It was added to the National Register of Historic Places in the 1980s.

Climate

According to the

Köppen Climate Classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...

system, East Park Reservoir has a

hot-summer mediterranean climate A Mediterranean climate ( ), also called a dry summer climate, described by Köppen and Trewartha as ''Cs'', is a temperate climate type that occurs in the lower mid-latitudes (normally 30 to 44 north and south latitude). Such climates typic ...

, abbreviated "Csa" on climate maps. The hottest temperature recorded at East Park Reservoir was on July 20, 1988 and July 30, 2003, while the coldest temperature recorded was on December 11, 1932.

References

{{coord, 39.36134, -122.51332, format=dms, display=title, type:landmark_region:US-CA Arch dams Buildings and structures in Colusa County, California Dams completed in 1910 Dams in California Dams on the National Register of Historic Places in California United States Bureau of Reclamation dams Dams in the Sacramento River basin National Register of Historic Places in Colusa County, California

The Orland Project

Climate

See also

References