Lake Glenn Shoals is a 1,250 acres (510 ha) reservoir located in Montgomery County, Illinois.

Created in 1976 by damming the Middle Fork of Illinois's Shoal Creek, it was built for recreation, sport fishing, and water supply purposes.

[2] Lake Glenn Shoals is managed for bass, bluegill, catfish, crappie, and tiger muskie.

The lake is managed in two halves, north and south of the Irving Township bridge, with boats able to go as fast as 35 miles per hour (56 km/h) south of the bridge but only 5 miles per hour (8.0 km/h) north of the structure.

These findings could be connected to the significant use of the lake's drainage catchment area by commercial farmers.