Twin Lakes Dam (Twin Lakes)

Field Descriptions

Dam Name: Twin Lakes
NID ID: WI00808
Longitude: -89.16666
Latitude: 46.02167
County: VILAS
River: TWIN
State: WI
Nearest City: EAGLE RIVER
Distance: 20.00 miles
Owner Name: WISCONSIN VALLEY IMPROVEMENT COMPANY
Owner Type: Public Utility
Private Dam? No
Core: Upstream Facing (Position)
Earth (Type)
Estimated (Certainty)
Foundation: SZ
Purposes: Hydroelectric
Year Completed: 1908
Dam Length: 157 feet
Dam Height: 10 feet
Maximum Discharge: 399 cu ft/sec
Maximum Storage: 93526 acre-feet
Drainage Area: 26 square miles
Hazard Potential: Low
Emergency Action Plan? Not Required By Submitting Agency
Inspection Date: 2012-09-06
Inspection Frequency: 3
State Regulated Dam? No
Spillway Type: Controlled
Spillway Width: 14 feet
Outlet Gates: T1;
Federal Regulatory Agency:
Federal Inspection Agency:
Source Agency:

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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