Blackwood Creek 63-A Reservoir Report
Last Updated: December 5, 2025
Blackwood Creek 63-A is a locally owned and state-regulated earth dam located in McCook, Nebraska.
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Summary
Designed by USDA NRCS and completed in 1989, this flood risk reduction structure has a height of 55 feet and a length of 1065 feet, providing a storage capacity of 2522.2 acre-feet. With a drainage area of 11.8 square miles and a maximum discharge of 6536 cubic feet per second, the dam serves to protect the surrounding area from potential flooding events.
Managed by the Nebraska Department of Natural Resources, Blackwood Creek 63-A has a low hazard potential and is deemed to be in satisfactory condition as of the last inspection in June 2020. The dam's purpose is solely for flood risk reduction, with a normal storage capacity of 16 acre-feet and a surface area of 4 acres. While the structure has not been modified in recent years, it undergoes inspections every 5 years to ensure its continued safety and functionality. Overall, Blackwood Creek 63-A stands as a crucial component of water resource management in the area, safeguarding against potential flooding and promoting environmental sustainability.
Year Completed |
1989 |
Dam Length |
1065 |
Dam Height |
55 |
River Or Stream |
GOV CANYON TR-BLACKWOOD CR |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
55 |
Drainage Area |
11.8 |
Nid Storage |
2522.2 |
Structural Height |
71 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
71 |
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.
Blackwood Creek 63-A