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Boise River: Anderson Ranch Dam
Anderson Ranch Dam on the South Fork of the Boise River, southwestern Idaho.
Boise River
river, Idaho, United States
News •
A key section of the Boise River Greenbelt will be closed this week. Here’s where
• Oct. 18, 2026, 6:00 AM ET (Idaho Statesman)
Boise River, watercourse, southwestern Idaho, U.S., formed by the confluence of the Middle Fork and North Fork branches, southeast of Idaho City in Boise National Forest. It flows generally westward through Arrowrock and Lucky Peak reservoirs and through the city of Boise to join the Snake River at the Oregon line after a course of about 95 miles (150 km). Dams along the river include Lucky Peak, Arrowrock, and Anderson Ranch (on the South Fork). The name of the river, like the name of Idaho’s capital, is from the French boisé, meaning “wooded.” Before 1863 the river was called Reed (or Reeds) River.
The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Amy Tikkanen.
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