Quick Facts About O’Neill Forebay Dam
O’Neill Forebay Dam Map
O’Neill Forebay Dam Information
O’Neill Forebay Dam is an earthen embankment dam located about 6 miles from Volta, Merced, California.
The dam, which is on the San Luis Creek River, was primarily built for Hydroelectric purposes, but also serves for benefits.
The dam was designed by and commissioned in 1967 and is currently owned by US Bureau of Reclamation.
O’Neill Forebay Dam Structure
The O’Neill Forebay Dam is approximately 14,300 feet (4,359 m) long, 88 feet (27 m) high and has a structural volume of 2,877,000 cubic yards (2,199,625 cubic metres).
O’Neill Forebay Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 56,430 acre-ft (69,605 Ml) and maximum capacity of 64,800 acre-ft (79,930 Ml).
The surface area of the reservoir is 2,250 acres (911 ha) and the total catchment area is 18 square miles (47 square kilometres).
O’Neill Forebay Dam Spillway
The dam has a 105 feet (32 m) wide uncontrolled spillway with a maximum discharge capacity of 3250 cubic feet per second (92 cubic metres per second).
O’Neill Forebay Dam Compared to Four Famous American Dams
| O’Neill Forebay Dam Merced, California |
Hoover Dam Clark County, Nevada |
Grand Coulee Dam Okanogan County, Washington |
Theodore Roosevelt Dam Maricopa County, Arizona |
Glen Canyon Dam Coconino County, Arizona |
|
|---|---|---|---|---|---|
| Height (ft) | 88 | 730 | 550 | 357 | 216 |
| Length (Ft) | 14,300 | 1,244 | 5,673 | 6,920 | 1,565 |
| Storage Volume (acre-ft) | 64,800 | 30,237,000 | 9,562,000 | 3,540,000 | 29,875,000 |
| Drainage Area (sq miles) | 18 | 167,800 | 74,100 | 3,611 | 108,355 |
O’Neill Forebay Dam Weather
Current Conditions at O’Neill Forebay Dam
Failed to fetch current weather data.7-Day Forecast for O’Neill Forebay Dam
Failed to fetch weather forecast data.O’Neill Forebay Dam Frequently Asked Questions
O’Neill Forebay Dam is in California.
O’Neill Forebay Dam is in Merced County.
O’Neill Forebay Dam is 88 feet high.
O’Neill Forebay Dam is 14,300 feet long.
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B. F. Sisk DamBurns Dam
Castle Dam
Lake Yosemite Dam
Los Banos Creek Detention Dam
O'Neill Forebay Dam
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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