Sebago Lake Dam (Sebago Lake)

Field Descriptions

Dam Name: Sebago Lake Dam
Other Name: HEAD GATES R
NID ID: ME00071
Longitude: -70.55139
Latitude: 44.0175
County: CUMBERLAND
River: PRESUMPSCOT RIVER
State: ME
Nearest City: Standish
Owner Name: S.D. WARREN CO.
Owner Type: P
Private Dam? No
Dam Type: CNREST
Year Completed: BLAN
Dam Length: 1500 feet
Structural Height: 32 feet
Hydraulic Height: 21 feet
Maximum Discharge: 970 cu ft/sec
Maximum Storage: 340000 acre-feet
Normal Storage: 223000 acre-feet
Surface Area: 28777 acres
Hazard Potential: High
Emergency Action Plan? Yes
Inspection Date: 1990-01-01
State Regulated Dam? Yes
State Regulating Agency: MEMA
Spillway Type:
Federal Funding Agency: HEAD GATES R
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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