Painted Rock Dam

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Painted Rock Dam
PaintedRock.jpg
Photo taken during period of high runoff, with the resultant reservoir nearly full
Painted Rock Dam is located in Arizona
Painted Rock Dam
Location of Painted Rock Dam
Official name Painted Rock Dam
Location Maricopa County, Arizona,
United States
Coordinates 33°4′22″N 113°0′56″W / 33.07278°N 113.01556°W / 33.07278; -113.01556Coordinates: 33°4′22″N 113°0′56″W / 33.07278°N 113.01556°W / 33.07278; -113.01556
Construction began 25 July 1957
Opening date 18 Jan 1960
Construction cost $13,670,000
Operator(s) United States Army Corps of Engineers
Dam and spillways
Impounds Gila River
Height 181 feet (55 m)
Length 4,780 feet (1,460 m)
Reservoir
Creates Painted Rock Reservoir
Total capacity 2,491,700 acre feet (3.0735×109 m3)

The Painted Rock Dam is an earthfill embankment dam located west of Gila Bend, Arizona. It is primarily used for flood control purposes.

Description[edit]

The Painted Rock Dam was constructed during a 3-year period from 1957-1960 by the United States Army Corps of Engineers to help control seasonal floods on the lower reaches of the Gila River. The river had no significant impediments between the Colorado River and the Coolidge Dam hundreds of miles upstream. In this stretch the river receives several tributaries, including the Hassayampa, Agua Fria rivers, and most importantly the Salt River and its major tributary, the Verde River. Due to a relatively large watershed of 50,800 square miles (132,000 km2), more than half of which is unregulated, the flood threat to small farming communities downstream on the Gila River is large, and seasonal flooding of these areas prior to the construction of the dam was significant.[1]

The area surrounding the dam has also hosted a number of historical events. The Butterfield Overland Mail route passed through the area, as did the path followed by the Mormon Battalion. Evidence of both can be found, as well as the expedition of Juan Bautista De Anza in 1774. Inscriptions made by these groups can be found in various sites in the region.

Near the dam site, there is also a campground maintained by the Bureau of Land Management that showcases a number of prehistoric petroglyphs, indicating human involvement in the region long predating Western influence.[2] It is from the Painted Rock Petroglyph Site that the area and the dam get their names.

Painted Rock Reservoir
Location Arizona
Coordinates 33°4′22″N 113°0′56″W / 33.07278°N 113.01556°W / 33.07278; -113.01556 (Painted Rock Reservoir)
Type reservoir
Primary inflows Gila River
Primary outflows Gila River, evaporation
Catchment area 50,800 sq mi (132,000 km2)
Basin countries United States
Surface area 53,200 acres (215 km2) (maximum)
Max. depth 181 ft (55 m)
Water volume 2,491,700 acre·ft (3.0735 km3) (maximum)
Surface elevation 661 ft (201 m)

The lake and reservoir are dry as of August 2009 and are closed to the public due to contamination of pesticide run off. This is in stark contrast to the level of upkeep during the 1990s. The state was forced to abandon the campground and the area is now marked as "NO TRESPASSING". No hunting, hiking, or camping is allowed. The Army Corps of Engineers now maintains the property.

Painted Rock Reservoir[edit]

The Painted Rock Reservoir is an artificial reservoir impounded by the Painted Rock Dam. The reservoir, with a maximum storage capacity of 2,491,700 acre feet (3.0735×109 m3), has the potential to be the second largest reservoir completely within the borders of the state of Arizona, but because the Gila River and its main tributary, the Salt River, are generally almost always completely diverted for irrigation and municipal water use for Phoenix, the lake is often dry.

In 2005, heavy runoff filled the reservoir to record levels, swelling the lake to become the second largest by area in the state of Arizona, trailing only Theodore Roosevelt Lake. However, extremely high levels of pesticides, particularly the now-banned DDT, had built up in the farmlands upstream from the reservoir in the decades prior and accumulated in the lake during the flood. The extreme toxicity of the lake rendered it unsuitable for recreational uses and public access to both the lake and the dam was restricted.[3] Similar runoff had filled the lake previously in 1993 and 1980, and in each instance the lake persisted only a few months before emptying due to losses through evaporation, downstream releases, and infiltration.

Displacement of Native Americans[edit]

Water impounded by the Painted Rock Dam caused the flooding of about 10,000 acres of the Tohono O'odham's Gila Bend Reservation. The flooding destroyed a 750-acre tribal farm and several communities. Residents were relocated to a 40 acre parcel called San Lucy Village, Arizona. In 1986, the federal government and the Nation approved a settlement in which the Nation agreed to give up its legal claims in exchange for $30,000,000 and the right to add up to 10,000 acres of newly purchased land to its Reservation.[4][5]

See also[edit]

References[edit]

  1. ^ "Painted Rock Dam". Army Corps of Engineers. Retrieved 2008-06-03. [dead link]
  2. ^ "Painted Rock Petroglyph Site". Town of Gila Bend. Retrieved 2008-06-03. [dead link]
  3. ^ Dougherty, John (2005-03-10). "Contaminated Splendor". Phoenix New Times. Retrieved 2008-06-03. 
  4. ^ ISSUE BRIEF: THE UNITED STATES’ OBLIGATION TO REPLACE DAMAGED RESERVATION LAND
  5. ^ Monica Alonzo, Wanna Bet? The Tohono O'odham Want to Build a Casino in the West Valley -- Now It's Up to the Feds to Make It Happen or Break Another Promise to the Tribe, Phoenix New Times, Apr. 29 2010, available at http://www.phoenixnewtimes.com/2010-04-29/news/wanna-bet-the-tohono-o-odham-want-to-build-a-casino-in-the-west-valley-now-it-s-up-to-the-feds-to-make-it-happen-or-break-another-promise-to-the-tribe/