The Lockport Powerhouse is an American run-of-the-river dam used by the Metropolitan Water Reclamation District of Greater Chicago to control the outflow of the Sanitary and Ship Canal and limit the diversion of water from Lake Michigan into the Des Plaines River.

Seven waste gates, used to control the level of water in the canal and Des Plaines River, were part of this project.

Designed by Frederick L. Barrett, the red-roofed Beaux Arts powerhouse was constructed with concrete blocks coursed to resemble stone.

[3] A second phase of construction occurred from 1922 to 1933 to handle differing water loads following the opening of the Ohio River Standard Navigation Lock.

[1] The lock next to the dam & powerhouse is largely used for barge traffic and has a 39 foot (11.8 meters) drop.