Grizzly Valley Dam

Grizzly Valley Dam Quick Facts

Location: Plumas, California
Coordinates: 39.8827, -120.4771
River: Big Grizzly Cr River
Primary Purpose: Water Supply
Type: Earth
Commissioned: 1966
Dam Height: 115 ft (35 m)
Dam Length: 800 ft (244 m)
Dam Capacity: 83,000 acre-ft (102,379 Ml)
Condition Assessment: Satisfactory
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Grizzly Valley Dam Map

Grizzly Valley Dam Information

Grizzly Valley Dam is an earthen embankment dam located about 8 miles from Portola, Plumas, California.

The dam, which is on the Big Grizzly Cr River, was primarily built for Water Supply purposes, but also serves for Recreation benefits.

The dam was designed by and commissioned in 1966 and is currently owned by California Department of Water Resources.

Grizzly Valley Dam Structure

The Grizzly Valley Dam is approximately 800 feet (244 m) long, 115 feet (35 m) high and has a structural volume of 253,000 cubic yards (193,432 cubic metres).

Grizzly Valley Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of acre-ft (0 Ml) and maximum capacity of 83,000 acre-ft (102,379 Ml).

The surface area of the reservoir is 4,032 acres (1,632 ha) and the total catchment area is 44 square miles (114 square kilometres).

Grizzly Valley Dam Spillway

According to the latest available data, the Grizzly Valley Dam does not have any spillways.

Grizzly Valley Dam Compared to Five Famous American Dams

Height (ft)
Length (Ft)
Storage Volume (acre-ft)
Drainage Area (sq miles)
 
Grizzly Valley Dam
Plumas, California
Height (ft)
115
Length (Ft)
800
Storage Volume (acre-ft)
83,000
Drainage Area (sq miles)
44
Hoover Dam
Clark County, Nevada
Height (ft)
730
Length (Ft)
1,244
Storage Volume (acre-ft)
30,237,000
Drainage Area (sq miles)
167,800
Grand Coulee Dam
Okanogan County, Washington
Height (ft)
550
Length (Ft)
5,673
Storage Volume (acre-ft)
9,562,0000
Drainage Area (sq miles)
74,100
Theodore Roosevelt Dam
Maricopa County, Arizona
Height (ft)
357
Length (Ft)
1,208
Storage Volume (acre-ft)
3,411,500
Drainage Area (sq miles)
5,736
Oroville Dam
Butte County, California
Height (ft)
235
Length (Ft)
6,920
Storage Volume (acre-ft)
3,540,000
Drainage Area (sq miles)
3,611
Glen Canyon Dam
Coconino County, Arizona
Height (ft)
216
Length (Ft)
1,565
Storage Volume (acre-ft)
29,875,000
Drainage Area (sq miles)
108,355

Grizzly Valley Dam Weather

Current Conditions at Grizzly Valley Dam

Parameter Value
Current Time 17:43
Sunrise 06:44
Sunset 16:48
Temperature (°F) 26
Feels Like (°F) 26
Cloud Coverage (%) 60
Pressure (inHg) 1025
Humidity (%) 96
Wind Speed (mph) 2
Rain (mm) 0

7-Day Forecast for Grizzly Valley Dam

Day Min Temp (°F) Max Temp (°F) Feels Like (°F) Pressure (inHg) Humidity (%) Wind Speed (mph) Wind Gust (mph) Wind Dir Precip Prob (%) Precip Volume (mm) Weather
Today 25 40 38 1024 68 4 6 WSW 2 - few clouds
Wed 23 41 33 1015 64 18 45 SW 100 - snow
Thu 23 37 33 1017 85 9 30 SW 100 - snow
Fri 15 32 26 1012 95 5 8 W 100 - snow
Sat 11 32 27 1021 90 3 4 E 0 - overcast clouds
Sun 11 34 32 1018 76 4 12 SW 95 - light snow
Mon 12 31 25 1019 89 6 17 W 100 - light snow
Tue 7 30 20 1032 73 5 9 ENE 0 - overcast clouds

Grizzly Valley Dam Frequently Asked Questions

In which state is the Grizzly Valley Dam?

Grizzly Valley Dam is in California.

In which county is the Grizzly Valley Dam?

Grizzly Valley Dam is in Plumas County.

How high is the Grizzly Valley Dam?

Grizzly Valley Dam is 115 feet high.

How long is the Grizzly Valley Dam?

Grizzly Valley Dam is 800 feet long.

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More Dams in Plumas County:

Antelope Dam
Bidwell Lake Dam
Bucks Lake Dam
Butt Valley Dam
Frenchman Dam
Grizzly Valley Dam
Lake Almanor Dam
Little Grass Valley Dam
Lower Bucks Lake Dam

Condition Assessment Classification

Satisfactory

No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.

Fair

No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum

Poor

A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.

Unsatisfactory

A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.

Not Rated

The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.

Not Available

Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High

Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.

Significant

Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.

Low

Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner’s property.

Undetermined

Dams for which a downstream hazard potential has not been designated or is not provided.

Not Available

Dams for which the downstream hazard potential is restricted to approved government users.

Source: National Inventory of Dams

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