US Army Corps of Engineers
Tulsa District Website Website

Pertinent Data

Authorization: Authorized as a part of the McClellan-Kerr Arkansas River Navigation System in the River and Harbor Act approved July 24, 1946, Project Document HD 758, 79th Congress, 2d Session. Section 1117 of the Water Resources Development Act of 1986, Public Law 99-662, authorized the Cherokee Nation of Oklahoma to design and construct hydroelectric generating facilities at W. D. Mayo Lock and Dam.

Location: On the Arkansas River at navigation mile 319.6, about 9 miles southwest of Fort Smith, Arkansas, in LeFlore and Sequoyah Counties, Oklahoma.

Status: Completed

Purpose: Navigation.

History of Construction: Construction began in May 1966. Closure was completed on October 15, 1970, and the project was placed in useful operation. The lock and dam became operational for navigation in December 1970.

Type of Structure: The 7,400-foot-long dam consists of a low concrete apron and sill surmounted by tainter gates separated by 10-foot concrete piers. The gates are operated with machinery constructed on the piers. Twelve 60- by 21-foot tainter gates are provided for the structure.


Lock: The lock has a 110- by 600-foot chamber of the single-lift type with miter gates. The lock has a 20-foot normal lift and 22-foot maximum lift.


Project Data:

Feature Elevation

Top of Overflow Section
    (left bank)
414.0 --- ---
Top of Spillway Gates 413.0 --- ---
Top of Upper Pool 413.0 1,595 15,800
Bottom of Upper Pool 411.0 --- ---
Weir Crest 392.0 --- ---
Top of Lower Pool 392.0 --- 12,800
Bottom of Lower Pool 391.0 --- ---

Note: The drainage area above the dam site is 148,084 square miles.