Glad Valley Reservoir Report
Nearby: M. Matthews L. Barnica
Last Updated: December 7, 2025
Glad Valley, a state-owned Earth dam located in Ziebach, South Dakota, was completed in 1938 by the Works Progress Administration (WPA).
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Summary
With a height of 18 feet and a length of 800 feet, this dam on the TR GRAND river serves multiple purposes, including flood control and irrigation for the surrounding area. The dam has a maximum storage capacity of 1146 acre-feet and a normal storage capacity of 308 acre-feet, making it a vital water resource for the region.
Despite being classified as having low hazard potential and a moderate risk assessment rating, Glad Valley is regulated and inspected by the South Dakota Department of Agriculture and Natural Resources (DANR). The dam features an uncontrolled spillway with a width of 36 feet and no outlet gates. The last inspection was conducted in October 2018, with a scheduled inspection frequency of every 3 years. While the dam's condition is currently not rated, it continues to play a crucial role in water management and climate resilience efforts in the area.
Managed by state agencies and without federal funding or oversight, Glad Valley stands as a testament to the importance of local water management and infrastructure resilience. With its historical significance as a WPA project and its continued role in providing water resources for the community, this dam serves as a reminder of the ongoing need for sustainable water management practices in the face of changing climate conditions. Enthusiasts of water resources and climate resilience will find Glad Valley to be a fascinating example of how local initiatives can have a lasting impact on water security and environmental protection.
Year Completed |
1938 |
Dam Length |
800 |
Dam Height |
18 |
River Or Stream |
TR GRAND |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
1146 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
18 |
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.
Glad Valley