Loon Lake Dam (Island / Loon Lakes)

Field Descriptions

Dam Name: Loon Lake
NID ID: MN82432
Longitude: -93.8827
Latitude: 47.1046
County: CASS
River: TR-NORTH FORK WILLOW RIV
State: MN
Nearest City: NONE
Owner Name: USDA FS
Owner Type: Federal
Private Dam? No
Dam Type: Earth
Purposes: Fish and Wildlife Pond
Year Completed: 1969
Dam Length: 180 feet
Dam Height: 7 feet
Structural Height: 7 feet
Hydraulic Height: 6 feet
Maximum Discharge: 54 cu ft/sec
Maximum Storage: 530 acre-feet
Normal Storage: 284 acre-feet
Drainage Area: 1 square miles
Hazard Potential: Low
Emergency Action Plan? Not Required By Submitting Agency
Inspection Date: 2006-09-11
Inspection Frequency: 0
State Regulated Dam? No
Spillway Width: 0 feet
Volume of Dam: 32760 cubic yards
Federal Design Agency: U.S. Department of Agriculture;
Forest Service
Federal Construction Agency: U.S. Department of Agriculture;
Forest Service
Federal Regulatory Agency: U.S. Department of Agriculture;
Forest Service
Federal Inspection Agency: U.S. Department of Agriculture;
Forest Service
Federal Operating Agency: U.S. Department of Agriculture;
Forest Service
Federal Owner (Agency): U.S. Department of Agriculture;
Forest Service
Source Agency: U.S. Department of Agriculture;
Forest Service

Dam Safety For Boats

A large amount of water can be released from a dam without any warning at any time and by any means. For example, when the demand for electricity is high, the turbines at a dam may be turned on automatically, resulting in a significant increase in the downstream flow of water in only a matter of seconds.

If there's a need to release water through the sluiceways (outlets at the base of the dam), this operation can also create a great swell of discharged water downstream.

During flood operations, any or all spillway gates across the width of a dam can be opened to release upstream flood water that needs to pass to the next downstream reservoir. Upstream or downstream, even the most experienced boater with the strongest motor is no match for this strong flow of water plunging over a spillway of a dam. Even if you're boating far downstream of a spilling dam, recirculating current can pull a powerful boat upstream toward plunging water that could shred any boat.

Some dams equipped with navigation locks create turbulent water as well. When vessels pass through, strong flow is released near the exhaust ports of the wing wall of the lock.

Warning Systems At Dams

To warn reservoir users of potential danger, warning devices are installed at many dams:






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