Arrowrock Dam, Arch dam in Elmore County, United States.
The Arrowrock Dam spans 1,150 feet across the Boise River, reaching a height of 350 feet and forming a substantial reservoir for water management.
Upon completion in 1915, this concrete structure held the title of largest arch dam worldwide, marking a milestone in civil engineering advancement.
The dam's construction created a temporary community of 1,400 workers who received modern amenities, establishing new living standards in early 1900s Idaho.
The reservoir maintains a capacity of 300,850 acre-feet, providing irrigation water for agriculture and supporting recreational activities like fishing and boating.
Engineers incorporated temperature monitoring instruments directly into the concrete structure during construction, implementing advanced safety measures for that period.
Location: Elmore County
Location: Boise County
GPS coordinates: 43.59556,-115.92194
Latest update: May 19, 2025 21:07
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