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Lake Glenn Shoals

Lake Glenn Shoals, located in central Illinois, in Montgomery County near Hillsboro, provides over 1.250 acres of multi-purpose waters. Sometimes referred to as Glenn Shoals Lake, this reservoir was created in 1978 when an earthen dam was built on the Middle Fork of Shoal Creek.

Originally built to provide flood control and drinking water for the residents of Hillsboro, the lake and dam were improved in 1996 and became a popular destination for outdoor recreation and sport fishing.

Owned and operated by the city of Hillsboro, Lake Glenn Shoals is maintained to provide a picturesque environment in which visitors can enjoy safe boating, water-skiing, fishing, golfing, camping and picnicking. Although there are no designated hiking or biking trails, visitors are encouraged to walk, hike and bike throughout the breathtaking nature showcased in the area.


Hearty populations of largemouth bass, bluegill, hybrid striped bass, sunfish, carp, channel catfish, bullhead, tiger muskie and white crappie provide excellent catches for anglers who fish in Lake Glenn Shoals.

The Illinois Department of Natural Resources Division of Fisheries offers "Spear/Bow and Arrow" and "Hook-and-Line" Sport-Fishing Awards to recognize anglers for fish caught in Illinois' waters. (Click link at right to learn more.)


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    Lake Glenn Shoals Illinois Coordinates:
39.2056N -89.4626W
Map It:
Lake Type:
Surface Area:
1,250 acres
Maximum Depth:
25 ft
590 ft
Normal Water Clarity:
2-3 ft
Major City:


Lake Glenn Shoals welcomes most boat and motor types and sizes, but boats must abide strict speed limits for specific areas of the lake.

Lake Glenn Shoals has been divided into areas so to accommodate motorboats and water-skiers, as well as rowboats, canoes and sailboats. The area designated for sailboats and canoes is a "No-Wake" Zone. The area from the dam to the bridge has a speed limit of 35 m.p.h. while north of the bridge is a "No Wake" zone where the speed limit is 5 m.p.h.

A public boat launch ramp on each end of the lake provides easy access to the water while a full-service marina offers most everything boaters and anglers might need. Boaters must purchase a City Boat Permit before boating in Lake Glenn Shoals.


Although much of Lake Glenn Shoals' 27-mile shoreline has been developed with vacation homes, lake-front lots on which to pitch a tent are available. There are no accommodations for RVs or Campers. In fact, almost all of these lake-front campsite lots are only accessible by boat.

Please consult theLake Resource Guide for information about nearby lodging facilities and other amenities.


Illinois' closest major city to Lake Glenn Shoals is Springfield. Nearby cities and towns, each with its own unique offerings, include: Hillsboro, Alton, Salem, Taylorville and Decatur. Lake Glenn Shoals flows through parts of Montgomery county.

Fun times at Lake Glenn Shoals  Lake Glenn Shoals

  Lake Glenn Shoals   Lake Glenn Shoals

Average Temperatures Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Avg. High  38 Avg. High  44 Avg. High  55 Avg. High  68 Avg. High  77 Avg. High  86 Avg. High  89 Avg. High  88 Avg. High  81 Avg. High  69 Avg. High  55 Avg. High  41
Avg. Low  21 Avg. Low  25 Avg. Low  35 Avg. Low  45 Avg. Low  55 Avg. Low  64 Avg. Low  68 Avg. Low  66 Avg. Low  57 Avg. Low  46 Avg. Low  36 Avg. Low  25