Little Wood River Project Project Pages are under construction. Please contact the responsible office for current information. Information Little Wood River Dam and Reservoir General Description Little Wood River Project includes lands within an area 2 miles wide and 12 miles long upstream and downstream from Carey, Idaho, in the south-central section of the State. The project provides a supplemental irrigation water supply for approximately 9,550 acres of land. The principal construction feature is the enlarged Little Wood River Dam and Reservoir that serve previously constructed diversion and distribution works.
Flood control is provided by operation of the reservoir on a forecast basis.
Plan An increased water supply to meet the need of water users in the project area was provided by increasing the height of Little Wood River Dam by approximately 35 feet in 1960. The diversion and carriage facilities on the project remained unchanged. Little Wood River Dam Rehabilitation work included raising the dam crest 39 feet, extending the outlet tunnel downstream 150 feet, and relocating the spillway from right to left abutment. The completed structure has a structural height of 129 feet high, with a zoned earthfill embankment containing about 959,000 cubic yards of material. The spillway consists of an inlet channel, a concrete spillway structure with uncontrolled crest, an outlet channel, and a training wall on the right side of the outlet channel beginning approximately 1,000 feet downstream from the spillway crest.