Arrowrock Dam

Arrowrock Dam
Aerial view from the west
Arrowrock Dam is located in the United States
Arrowrock Dam
Location in the United States
Arrowrock Dam is located in Idaho
Arrowrock Dam
Location in Idaho
CountryUnited States
LocationBoise and Elmore counties, Idaho
Coordinates43°35′44″N 115°55′20″W / 43.59556°N 115.92222°W / 43.59556; -115.92222
PurposeIrrigation
Construction began1911 (1911)
Opening date1915; 109 years ago (1915)[1]
Owner(s)U.S. Bureau of Reclamation
Dam and spillways
Type of damArch dam
ImpoundsBoise River
Height350 feet (107 m)[1]
Length1,150 feet (351 m)[1]
Reservoir
CreatesArrowrock Reservoir
Total capacity300,850 acre-feet (0.371 km3)[1]
Catchment area2,200 square miles (5,700 km2)[1]
Surface area3,100 acres (12.5 km2)[1]
Normal elevation3,210 ft (978 m) AMSL
Power Station
Operator(s)Boise Project
Board of Control[2]
Commission dateMarch 2010;
14 years ago
 (2010-03)[2]
Installed capacity15 MW[2]
Columbia River Basin
Columbia River Basin
Arrowrock Dam
NRHP reference No.72000437
Added to NRHP1976
Reservoir side of Arrowrock Dam spring 2016
Outlet side of Arrowrock Dam fall 2022

Arrowrock Dam is a concrete arch dam in the western United States, on the Boise River in southwestern Idaho, east of Boise. Opened 109 years ago in 1915, it is located on the border of Boise and Elmore counties, upstream of the Lucky Peak Dam and reservoir. The spillway elevation for Arrowrock is 3,219 feet (981 m) above sea level and its primary purpose is to provide irrigation water for agriculture.

The dam was designated as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers in 2016,[3] and is operated by the U.S. Bureau of Reclamation.

  1. ^ a b c d e f Arrowrock Dam Archived 2012-03-12 at the Wayback Machine, NPDP Dam Directory
  2. ^ a b c Arrowrock Dam, US Bureau of Reclamation
  3. ^ Ross, Anette (2016-09-09). "Arrowrock Dam Recognized as Historic Civil Engineering Landmark" (Press release). U.S. Bureau of Reclamation. Retrieved 2021-02-05.