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Markland Locks and Dam


The Markland Locks and Dam is located on the Ohio River at mile 531.5 below Pittsburgh, Pennsylvania. It is 26.5 miles upstream from Madison, Indiana and 3.5 miles downstream from Warsaw, Kentucky. The navigation locks are located on the Kentucky side of the river. The upper pool above the dam extends upstream for a distance of 95.3 miles to the Meldahl Locks and Dam at mile 436.0 and for a short distance up three navigable tributaries — the Miami, Licking, and Little Miami rivers.


The replacement plan for Ohio River Locks and Dams No. 35, 36, 37, 38 and 39 by the Markland Locks and Dam was reviewed by the Board of Engineers for Rivers and Harbors and was approved by the Secretary of the Army on March 11, 1953, in accordance with the Rivers and Harbors Act approved March 3, 1909.


Markland Locks’ construction started in March 1956. The locks were placed in operation in May 1959. Dam construction started in April 1959 and was completed in June 1964.

Locks and Dams

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Ohio River

Markland Locks and Dam
2760 US 42 West
Warsaw, KY 41095
(859) 567-7661

McAlpine Locks and Dam
805 North 27th Street
Louisville, KY 40212
(502) 776-6866

Cannelton Locks and Dam
5281 E. State Road 66
Cannelton, IN 47520
(812) 547-2962

Newburgh Locks and Dam
6877 State Road 66
Newburgh, IN 47630
(812) 853-8470

John T. Myers Locks and Dam
16501 Raben Road
Mt. Vernon, IN 47620
(812) 838-5836

Smithland Locks and Dam
1401 Smithland Dam Road
Brookport, IL 62910
(618) 564-2315

Olmsted Locks and Dam
567 New Dam Road
Olmsted, IL 62970
(618) 748-6400


Green River

Green River 1
5048 Dam and Lock Road
Reed, KY 42451
(270) 826-7360

Green River 2
695 W. 1st Street
Calhoun, KY 42327
(270) 273-3152

Lock Information

 Main Lock  110’ x 1200’
 Auxilliary Lock  110’ x 600’

Dam Information

Type Tainter gate
Length 1,395'
Upper pool 455'
Lower pool 420'
Number of gates 12
Height of gates 42'
Width of gates 42'