Navigation Dams in Illinois

Illinois has 16 navigation dams, of which 4 carry a high hazard classification. The dam maintains water levels sufficient for boat and barge traffic, supporting commercial or recreational navigation on the waterway.

#	Dam	County	Height (ft)	Hazard	Condition	Year
1	Jerry F. Costello Lock and Dam	Randolph	81	Significant	Not assessed	1974
2	Melvin Price Locks and Dam	St. Charles	77	Significant	Not assessed	1990
3	Olmsted Locks and Dam	Ballard	67	Significant	Not assessed	2018
4	Lockport Lock and Controlling Works	Will	65	High	Not assessed	1933
5	Mississippi River Lock and Dam 19	Lee	63	Significant	Not assessed	1913
6	Marseilles Lock and Dam	LaSalle	58	Significant	Not assessed	1933
7	Smithland Locks and Dam	Livingston	56	Significant	Not assessed	1980
8	Brandon Road Lock and Dam	Will	45	High	Not assessed	1933
9	Thomas J. O'brien Lock and Controlling Works	Cook	37	High	Not assessed	1960
10	Starved Rock Lock and Dam	LaSalle	35	Significant	Not assessed	1933
11	Dresden Island Lock and Dam	Grundy	33	Significant	Not assessed	1933
12	Chicago River and Harbor Controlling Works	Cook	31	High	Not assessed	1938
13	Dayton	LaSalle	26	Low	Satisfactory	1925
14	Peoria Lock and Dam	Tazewell	23	Significant	Not assessed	1939
15	Lagrange Lock and Dam	Brown	21	Significant	Not assessed	1939
16	Kimball Street Dam	Kane	13	Significant	Not assessed	1884

← All dams in Illinois · Navigation Dams nationwide