Quick Facts About Little Grassy Dam
Little Grassy Dam Map
Little Grassy Dam Information
Little Grassy Dam is an earthen embankment dam located about 8 miles from Carbondale, Il, Williamson, Illinois.
The dam, which is on the Little Grassy Creek River, was primarily built for Fish and Wildlife Pond purposes, but also serves for Recreation and Flood Risk Reduction benefits.
The dam was designed by US FISH & WILDLIFE SERVICE and commissioned in 1942 and is currently owned by US FISH AND WILDLIFE SERVICE.
Little Grassy Dam Structure
The Little Grassy Dam is approximately 3,650 feet (1,113 m) long, 88 feet (27 m) high and has a structural volume of 3,485,600 cubic yards (2,664,933 cubic metres).
Little Grassy Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 24,000 acre-ft (29,604 Ml) and maximum capacity of 30,900 acre-ft (38,115 Ml).
The surface area of the reservoir is 960 acres (388 ha) and the total catchment area is 16 square miles (40 square kilometres).
Little Grassy Dam Spillway
The dam spillway has a maximum discharge capacity of 35943 cubic feet per second (1018 cubic metres per second).
Little Grassy Dam Compared to Four Famous American Dams
Little Grassy Dam Williamson, Illinois |
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) | 3,650 | 1,244 | 5,673 | 6,920 | 1,565 |
Storage Volume (acre-ft) | 30,900 | 30,237,000 | 9,562,000 | 3,540,000 | 29,875,000 |
Drainage Area (sq miles) | 16 | 167,800 | 74,100 | 3,611 | 108,355 |
Little Grassy Dam Weather
Current Conditions at Little Grassy Dam
Failed to fetch current weather data.7-Day Forecast for Little Grassy Dam
Failed to fetch weather forecast data.Little Grassy Dam Frequently Asked Questions
Little Grassy Dam is in Illinois.
Little Grassy Dam is in Williamson County.
Little Grassy Dam is 88 feet high.
Little Grassy Dam is 3,650 feet long.
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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