South Fork Boise River Sub-Basin

The South Fork Boise River is a major tributary of the Boise River, and its confluence with the Boise River is inundated by the Arrowrock Reservoir. The 1,310-square mile basin is mountainous with an extensive network of perennial streams. A major portion of the basin is covered by timber. The USDA Forest Service administers about 80% of the total land area. Timber harvest, recreation, and grazing are major activities in the basin. Two major storage reservoirs, Anderson Ranch and Little Camas, provide for irrigation, recreation, and flood control.

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