Quick Facts About St Marys River Watershed Site 1 Dam
St Marys River Watershed Site 1 Dam Map
St Marys River Watershed Site 1 Dam Information
St Marys River Watershed Site 1 Dam is an earthen embankment dam located about 3 miles from Great Mills, St. Mary’s, Maryland.
The dam, which is on the Western Br, St. Marys River, was primarily built for Flood Risk Reduction purposes, but also serves for Recreation benefits.
The dam was designed by ALLAN STAHL;USDA NRCS;USDA SCS-Allan Stahl and commissioned in 1975 and is currently owned by MD DNR-Public Lands, Engineering & Constr-Southern.
St Marys River Watershed Site 1 Dam Structure
The St Marys River Watershed Site 1 Dam is approximately 1,670 feet (509 m) long, 38 feet (12 m) high and has a structural volume of 260,000 cubic yards (198,784 cubic metres).
St Marys River Watershed Site 1 Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 3,200 acre-ft (3,947 Ml) and maximum capacity of 9,600 acre-ft (11,841 Ml).
The surface area of the reservoir is 250 acres (101 ha) and the total catchment area is 9 square miles (23 square kilometres).
St Marys River Watershed Site 1 Dam Spillway
The dam has a 300 feet (91 m) wide uncontrolled spillway with a maximum discharge capacity of 20576 cubic feet per second (583 cubic metres per second).
St Marys River Watershed Site 1 Dam Compared to Four Famous American Dams
| St Marys River Watershed Site 1 Dam St. Mary’s, Maryland |
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) | 38 | 730 | 550 | 357 | 216 |
| Length (Ft) | 1,670 | 1,244 | 5,673 | 6,920 | 1,565 |
| Storage Volume (acre-ft) | 9,600 | 30,237,000 | 9,562,000 | 3,540,000 | 29,875,000 |
| Drainage Area (sq miles) | 9 | 167,800 | 74,100 | 3,611 | 108,355 |
St Marys River Watershed Site 1 Dam Weather
Current Conditions at St Marys River Watershed Site 1 Dam
Failed to fetch current weather data.7-Day Forecast for St Marys River Watershed Site 1 Dam
Failed to fetch weather forecast data.St Marys River Watershed Site 1 Dam Frequently Asked Questions
St Marys River Watershed Site 1 Dam is in Maryland.
St Marys River Watershed Site 1 Dam is in St. Mary’s County.
St Marys River Watershed Site 1 Dam is 38 feet high.
St Marys River Watershed Site 1 Dam is 1,670 feet long.
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Little Seneca Dam
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Pearce Creek Disposal Area Dam
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St Marys River Watershed Site 1 Dam
T. Howard Duckett 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