Floodwater Ret. B-4 Reservoir Report
Nearby: Floodwater Ret. B-3 Clarks Lake
Last Updated: December 5, 2025
Floodwater Retention B-4, located in Larimer County, Colorado, serves as a vital infrastructure for flood risk reduction along Indian Creek.
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Summary
Built in 1978 by USDA NRCS, this earth dam stands at a height of 28 feet and stretches over 1100 feet in length. With a storage capacity of 2208 acre-feet and a drainage area of 13 square miles, the dam plays a crucial role in mitigating flood hazards in the region.
Managed by a private owner, Floodwater Retention B-4 is regulated by the Colorado Division of Water Resources, ensuring its compliance with state permitting, inspection, and enforcement requirements. Despite its high hazard potential, the dam is assessed to be in satisfactory condition, with the last inspection conducted in September 2019. The dam's emergency action plan is up to date, and it has been identified as a high-risk structure, underscoring the importance of continued monitoring and risk management measures.
As a key component of flood risk reduction efforts in the area, Floodwater Retention B-4 underscores the critical role of infrastructure in safeguarding communities and ecosystems from the impacts of extreme weather events. Its strategic location, design, and operational standards highlight the collaborative efforts between public agencies and private owners to enhance resilience and protect against the adverse effects of climate change on water resources.
Year Completed |
1978 |
Dam Length |
1100 |
Dam Height |
28 |
River Or Stream |
INDIAN CREEK |
Primary Dam Type |
Earth |
Surface Area |
134 |
Hydraulic Height |
28 |
Drainage Area |
13 |
Nid Storage |
2208 |
Structural Height |
33 |
Hazard Potential |
High |
Nid Height |
33 |
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.
Floodwater Ret. B-4