Arrowrock Dam, Arch dam in Elmore County, United States.
Arrowrock Dam is a concrete arch dam built across the Boise River in Idaho. The structure creates a large reservoir that serves as a water source for irrigation systems across the region.
This arch dam was completed in 1915 and was the largest of its type in the world at that time. The project demonstrated major advances in concrete construction techniques.
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 site is best visited during clear weather, with access via rural roads leading to a viewing area. Visitors should wear sturdy shoes and be prepared for hilly terrain.
During construction, temperature sensors were embedded directly into the concrete to monitor the structure. This early safety method was quite advanced for its era.
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