Trinity Dam (Trinity Lake)

Field Descriptions

Dam Name: Trinity
Other Name: CLAIR ENGLE LAKE
NID ID: CA10196
Longitude: -122.76167
Latitude: 40.80167
Map Section: S.15,T.34N,R.8W
County: TRINITY
River: TRINITY RIVER
State: CA
Nearest City: LEWISTON
Distance: 8.00 miles
Owner Name: U S BUREAU OF RECLAMATION
Owner Type: Federal
Private Dam? No
Dam Type: Earth
Purposes: Hydroelectric
Year Completed: 1962
Dam Length: 2450 feet
Dam Height: 458 feet
Hydraulic Height: 451.19 feet
Maximum Storage: 2447650 acre-feet
Normal Storage: 2447650 acre-feet
Surface Area: 16535 acres
Drainage Area: 688 square miles
Hazard Potential: High
Emergency Action Plan? Not Required By Submitting Agency
Inspection Frequency: 1
State Regulated Dam? No
Spillway Type: Uncontrolled
Spillway Width: 0 feet
Volume of Dam: 29410000 cubic yards
Federal Funding Agency: CLAIR ENGLE LAKE
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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