Standing Rock No. 1 Reservoir Report
Nearby: Maciejewski #1 Troy Lee Hunt
Last Updated: December 13, 2025
Standing Rock No.
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Summary
1 is a federal-owned irrigation dam located in Bullhead, South Dakota along Rock Creek. Built in 1991 by the Bureau of Indian Affairs, this earth dam stands at 39 feet in height and stretches 604 feet in length, serving primarily for irrigation purposes with a storage capacity of 315 acre-feet. Despite its critical role in water resource management, the dam has not been regularly inspected since October 2012, posing a high hazard potential due to its outdated condition assessment.
Managed by the Bureau of Indian Affairs, Standing Rock No. 1 lacks proper emergency action plans and risk management measures, leading to a very high risk assessment rating. The dam's spillway type is controlled, but without any outlet gates or locks, raising concerns about its ability to handle peak discharges during flooding events. With a risk assessment score of 1 (very high), there is an urgent need for comprehensive inspection and maintenance to ensure the safety and integrity of this essential water infrastructure.
As water resource and climate enthusiasts, it is crucial to advocate for the proper upkeep and monitoring of dams like Standing Rock No. 1 to prevent potential disasters and protect the surrounding communities and ecosystems. By pushing for regular inspections, emergency preparedness, and risk mitigation strategies, we can safeguard our valuable water resources and contribute to a more sustainable and resilient future in the face of changing weather patterns and environmental challenges.
Year Completed |
1991 |
Dam Length |
604 |
River Or Stream |
ROCK CREEK -TR |
Primary Dam Type |
Earth |
Nid Storage |
315 |
Structural Height |
39 |
Hazard Potential |
High |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Grand R At Little Eagle Sd
|
47cfs |
Cedar Creek Nr Raleigh
|
20cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
Cannonball River Nr Raleigh
|
40cfs |
Moreau R Near Whitehorse Sd
|
35cfs |
Cannonball River At Breien
|
96cfs |
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.
Standing Rock No. 1