Garrett Dam Reservoir Report
Nearby: V. Garrett Bakers Gulch Dam
Last Updated: December 7, 2025
Garrett Dam, located in Sully, South Dakota, is a privately owned structure that plays a crucial role in water resource management in the region.
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Summary
Completed in 1980, this earth dam stands at a height of 64 feet and has a storage capacity of 5,000 acre-feet, with a normal storage level of 1,090 acre-feet. The dam is situated on a tributary of Okobojo Creek, with a drainage area of 12 square miles.
With a low hazard potential and a moderate risk assessment rating, Garrett Dam has been classified as not rated in terms of condition assessment. Despite its age, the dam has not received a condition assessment date since its last inspection in July 1992. The spillway of the dam is uncontrolled and has a width of 110 feet, with a maximum discharge capacity of 9,000 cubic feet per second.
Overall, Garrett Dam serves as an essential infrastructure for water resource management in the area, with its strategic location and storage capacity contributing to flood control and water supply needs. Its low hazard potential and moderate risk assessment indicate that the dam is well-maintained and poses minimal risks to the surrounding community. However, given the lack of recent condition assessments, there may be a need for further evaluation and maintenance to ensure the long-term safety and functionality of the dam.
Year Completed |
1980 |
Dam Length |
600 |
Dam Height |
64 |
River Or Stream |
TRIB. OKOBOJO CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
64 |
Drainage Area |
12 |
Nid Storage |
5000 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
64 |
Seasonal Comparison
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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.
Garrett Dam