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LaSalle Lake

Commonwealth Edison's LaSalle County Nuclear Station Cooling Pond, better known as LaSalle Lake, provides 2,058 acres of recreational waters for seasonal boating and fishing. Located near Marseilles, Illinois, this lake was built as a perched cooling lake for the LaSalle County Nuclear Power Generating Station. Formed by levees, which are higher than the surrounding land, the lake was designed to catch the wind so it will help cool the water impounded from the Mississippi River. As a result, boaters are urged to use extreme caution as conditions can become hazardous very quickly.

The dirt and rock, which was excavated during the construction of the lake, comprises the entire 11-mile shoreline. The lake is as much as 70 feet deep at the excavation areas, but the average depth is only 15 feet.

The lake has varying hours during the year. Click here for hours of operation.


LaSalle Lake was open to public fishing in 1987 after the lake had been stocked with 10,000 8-10" channel catfish. Since then, the natural reproduction of the cats provides a tremendous population of this species in all sizes.

The most sought after fish in this lake include largemouth and smallmouth bass, white and yellow bass, hybrid striped bass, sunfish, bluegill catfish, walleye and freshwater drum.

Although fishing from a boat is common, a boat is not necessary to access the best fish in LaSalle Lake. Fishing from the rocky banks or the fishing pier allows ample access to the areas most populated with desirable fish. There is no bait sold, no close parking lots and no shade around LaSalle Lake. Bait, a bicycle, sunscreen and protective gear are important considerations for items to bring with you when fishing at LaSalle Lake.

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


  Search LaSalle Lake Resources
    LaSalle Lake Illinois Coordinates:
41.2542N -88.6306W
Map It:
Lake Type:
Perched Cooling Lake
Surface Area:
2,058 acres
Maximum Depth:
71 ft
Normal Water Clarity:
2-10 ft
Major City:


Because of the lake's perched construction, winds and waves can become extremely strong with little notice. For this reason, boating is done at the boater's own risk.

All boats on LaSalle Lake must be powered by gasoline engines and abide the 40 mph speed limit. Safety regulations prohibit sailboats, rowboats, surfboards and sailboards while swimming and water skiing are also prohibited on LaSalle Lake. Boaters must keep an eye out for the areas marked off by bright orange buoys, and take particular care to stay away from those areas.

Boat launching ramps are available on the lake at no charge.


There are no lodging facilities available around LaSalle Lake.

LaSalle Lake lodging options include campgrounds, cottages, cabins, motels/hotels, bed-n-breakfasts, country inns, lodges, resorts, log cabins, available in nearby towns.

Please consult theLake Resource Guide for information on lodging and events in the area.


Illinois's closest major city to LaSalle Lake is Chicago, which is approximately 75 miles away. Nearby cities and towns, each with its own unique offerings, include: Marseilles, Seneca, Streator, Morris and Peru. LaSalle Lake flows through parts of LaSalle county.

Fun times at LaSalle Lake  LaSalle Lake

  LaSalle Lake   LaSalle Lake

Average Temperatures Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Avg. High  31 Avg. High  37 Avg. High  49 Avg. High  62 Avg. High  72 Avg. High  81 Avg. High  84 Avg. High  83 Avg. High  77 Avg. High  65 Avg. High  50 Avg. High  36
Avg. Low  15 Avg. Low  19 Avg. Low  29 Avg. Low  40 Avg. Low  51 Avg. Low  60 Avg. Low  65 Avg. Low  62 Avg. Low  54 Avg. Low  42 Avg. Low  32 Avg. Low  20