Summary
Built in 1938, this earth dam stands at a height of 45 feet and has a storage capacity of 3,000 acre-feet. It is situated on Dawson Creek and serves a drainage area of 40 square miles, with a maximum discharge capacity of 11,000 cubic feet per second.
Managed by the South Dakota Department of Agriculture and Natural Resources, Lake Henry's spillway type is uncontrolled, with a width of 160 feet. The dam's hazard potential is deemed significant, with a moderate risk assessment rating of 3. Despite its age, the condition of the dam is currently not rated, and the last inspection took place in November 2016. With its vertical lift outlet gates and state permitting and inspection protocols in place, Lake Henry remains a critical water resource in the region for both water supply and climate resilience efforts.
Enthusiasts of water resources and climate management can appreciate the historical significance and engineering marvel of Lake Henry. As a key infrastructure in the St. Paul District managed by the state, it serves as a vital component of the local water supply system. With its strategic location and design features, including an earth dam and stone core, Lake Henry plays a crucial role in flood control and water management for the surrounding area. Its regulated status and regular inspection ensure the safety and integrity of this essential water resource for the community.
Year Completed |
1938 |
Dam Length |
1050 |
Dam Height |
45 |
River Or Stream |
DAWSON CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
45 |
Drainage Area |
40 |
Nid Storage |
3000 |
Outlet Gates |
Vertical Lift |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
45 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Scotland City Park (Ballfield)
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Scotland City Park
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Oilvet Park
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Menno Lake Rec Area
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Huber Campground - Lake Menno Rec Area
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Henry (Scotland)