Collett Dam

Collett Dam Quick Facts

Location: Lassen, California
Coordinates: 40.9728, -121.2162
River: Pit River – Offstream
Primary Purpose: Hydroelectric
Type: Earth Rockfill
Commissioned: 1991
Dam Height: 40 ft (12 m)
Dam Length: 2,900 ft (884 m)
Dam Capacity: 7,690 acre-ft (9,485 Ml)
Condition Assessment: Not Available
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Collett Dam Map

Collett Dam Information

Collett Dam is an earth rockfill dam located about 12 miles from Pitville, Lassen, California.

The dam, which is on the Pit River – Offstream, was primarily built for Hydroelectric purposes, but also serves for benefits.

The dam was designed by CH2M Hill and commissioned in 1991 and is currently owned by Malacha Hydro Limited Partnership.

Collett Dam Structure

The Collett Dam is approximately 2,900 feet (884 m) long, 40 feet (12 m) high and has a structural volume of cubic yards (0 cubic metres).

Collett Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of acre-ft (0 Ml) and maximum capacity of 7,690 acre-ft (9,485 Ml).

The surface area of the reservoir is 255 acres (103 ha) and the total catchment area is square miles (0 square kilometres).

Collett Dam Spillway

The dam has a 30 feet (9 m) wide uncontrolled spillway with a maximum discharge capacity of 700 cubic feet per second (20 cubic metres per second).

Collett Dam Compared to Five Famous American Dams

Height (ft)
Length (Ft)
Storage Volume (acre-ft)
Drainage Area (sq miles)
 
Collett Dam
Lassen, California
Height (ft)
40
Length (Ft)
2,900
Storage Volume (acre-ft)
7,690
Drainage Area (sq miles)
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

Collett Dam Weather

Current Conditions at Collett Dam

Parameter Value
Current Time 20:31
Sunrise 06:42
Sunset 16:54
Temperature (°F) 33
Feels Like (°F) 27
Cloud Coverage (%) 0
Pressure (inHg) 1028
Humidity (%) 42
Wind Speed (mph) 8
Rain (mm) 0

7-Day Forecast for Collett 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 27 53 41 1024 26 12 17 E 0 - few clouds
Thu 31 61 50 1023 17 8 8 ESE 0 - clear sky
Fri 37 65 56 1019 22 6 6 SSE 0 - clear sky
Sat 36 55 48 1014 34 5 6 WNW 0 - overcast clouds
Sun 37 51 45 1017 64 8 13 WNW 0 - overcast clouds
Mon 36 44 38 1010 75 12 27 SSW 100 10 moderate rain
Tue 30 40 29 1020 83 11 24 WSW 100 0 rain and snow
Wed 28 52 42 1023 55 7 7 SE 0 - overcast clouds

Collett Dam Frequently Asked Questions

In which state is the Collett Dam?

Collett Dam is in California.

In which county is the Collett Dam?

Collett Dam is in Lassen County.

How high is the Collett Dam?

Collett Dam is 40 feet high.

How long is the Collett Dam?

Collett Dam is 2,900 feet long.

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More Dams in Lassen County:

Collett Dam
Coyote Flat Dam
Heath Reservoir Dam
Hog Flat Dam
Indian Ole Dam
Lake Leavitt Dam
Mccoy Flat Dam
Red Rock No. 1 Dam
Round Valley Dam
Tule 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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