Summit Reservoir Report
Nearby: 83 No 2 (Nid) Lookout
Last Updated: December 8, 2025
Summit is a Federal-owned earth dam located in Lyman, South Dakota, with a primary purpose that is currently unspecified.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1938, this structure stands at a height of 18 feet and has a hydraulic height of 18 feet as well. With a length of 250 feet and a storage capacity of 60 acre-feet, Summit sits on the Dry Draw river and serves as a water resource management tool in the region.
Though last inspected in 1978, Summit is categorized as having a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite lacking recent assessments and emergency action plans, this dam remains an important piece of infrastructure for water management in the area. With a maximum discharge rate of 540 cubic feet per second, Summit plays a crucial role in regulating water flow and storage in the region, mitigating potential risks and ensuring water resource sustainability for the future.
While Summit's exact purposes and associated structures remain unspecified, its strategic location in Lyman, South Dakota, highlights its significance in the region's water resource management practices. As climate change continues to impact water availability and quality, structures like Summit play a crucial role in ensuring the resilience and sustainability of water resources for the surrounding communities. With proper maintenance and updated risk assessment measures, Summit can continue to serve as a key asset in adapting to changing climate conditions and safeguarding water resources for generations to come.
Year Completed |
1938 |
Dam Length |
250 |
Dam Height |
18 |
River Or Stream |
DRY DRAW |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
60 |
Hazard Potential |
Low |
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.
Summit