US Army Corps of Engineers
Tulsa District Website Website

Pertinent Data

Authorization: Flood Control Act approved July 3, 1958, HD 170, 85th Congress, 1st Session.

Location: On the Little River at river mile 145.3 about 5 miles northwest of Wright City in McCurtain County, Oklahoma.

Status: Complete

Purpose: Flood control, water supply, water quality, recreation, and fish and wildlife.

History of Construction: Construction began in February 1963. The project became operational in June 1969. The conservation pool filled to elevation 438.00 on January 7, 1970.

Type of Structure: The dam is a rolled earthfill embankment 7,712 feet long and rises to a maximum height of 124 feet above the streambed. Total length of the dam, dike and spillway is 22,470 feet.

Spillway & Outlet Works: The uncontrolled saddle spillway is a gravity ogee weir based on firm rock at the right abutment. The weir crest allows for future gates. The gross spillway weir is 608 feet wide with a concrete sill and apron. The design capacity of the spillway is 246,000 cubic feet per second. The outlet works located on the right abutment of the river section includes an intake structure, a 13-foot diameter conduit, a 48-inch low flow pipe and a 36-inch water supply static head line. The conduit is controlled by two 5-foot 8-inch by 13-foot hydraulically operated slide gates operated in tandem. The channel capacity below the dam is 8,000 cfs.

Hydrologic Data: The floods of February and April 1945 had a volume of 678,700 acre feet at the dam site which is equivalent to 20.04 inches of runoff from the upstream drainage area. The maximum discharge was measured ats 76,900 cfs in May 1961. An average daily inflow of 65,000 cfs occurred on May 3, 1990. The pool of record was set at 1:20 p.m. on May 17, 2009, at elev 475.10.