Grizzly Valley Dam (Lake Davis)

Field Descriptions

Dam Name: Grizzly Valley
Other Name: DAVIS, LAKE
NID ID: CA00039
Longitude: -120.475
Latitude: 39.8827
Map Section: S.2,T.23N,R.13E
County: PLUMAS
River: BIG GRIZZLY CR
State: CA
Nearest City: PORTOLA
Distance: 8 miles
Owner Name: CALIFORNIA DEPARTMENT OF WATER RESOURCES
Owner Type: State
Private Dam? No
Dam Type: Earth
Foundation: R
Purposes: Recreation
Year Completed: 1966
Dam Length: 800 feet
Dam Height: 115 feet
Hydraulic Height: 105 feet
Maximum Discharge: 3450 cu ft/sec
Maximum Storage: 125000 acre-feet
Normal Storage: 83000 acre-feet
Surface Area: 4026 acres
Drainage Area: 44 square miles
Hazard Potential: High
Emergency Action Plan? Not Required By Submitting Agency
Inspection Date: 2011-09-22
Inspection Frequency: 1
State Regulated Dam? Yes
State Regulating Agency: Division of Safety of Dams
Spillway Type: Uncontrolled
Spillway Width: 0 feet
Volume of Dam: 253000 cubic yards
Federal Funding Agency: DAVIS, 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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