T. Jennings Reservoir Report
Nearby: K Lazy K Dam M. Smith
Last Updated: December 13, 2025
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Summary
Jennings, located in Hyde, South Dakota, along the WEST FORK ELM CREEK, is a privately owned Earth dam completed in 1946 with a height of 20 feet and a length of 710 feet. The dam has a storage capacity of 120 acre-feet and a maximum discharge of 2600 cubic feet per second. Despite being classified as low hazard potential, the dam's condition is currently not rated.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), T. Jennings is subject to state regulation, permitting, inspection, and enforcement. The dam falls under the jurisdiction of the St. Paul District of the US Army Corps of Engineers, with no federal agency ownership or funding associated with it. The primary purpose of T. Jennings and its associated structures, if any, is not specified in the data provided.
While detailed information on emergency action plans, risk assessments, and hazard mitigation measures is lacking for T. Jennings, the dam's location and design characteristics make it a point of interest for water resource and climate enthusiasts. With its historical significance dating back to the mid-20th century, T. Jennings serves as a testament to the engineering feats and water management practices of its time, highlighting the importance of monitoring and maintaining aging infrastructure in the face of changing environmental conditions.
Year Completed |
1946 |
Dam Length |
710 |
Dam Height |
20 |
River Or Stream |
WEST FORK ELM CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
120 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
James R At Huron Sd
|
548cfs |
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.
T. Jennings