Floodwater Ret. B-2 Reservoir Report
Nearby: Box I #1 Box Elder #1
Last Updated: December 5, 2025
Floodwater Retention B-2, located in Larimer County, Colorado, is a privately owned earth dam designed by the USDA NRCS to primarily reduce flood risk along Boxelder Creek.
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Summary
Completed in 1982, this dam stands at a height of 66 feet and has a storage capacity of 12,005 acre-feet, with a normal storage capacity of 6,470 acre-feet. With a surface area of 457 acres and a drainage area of 111 square miles, Floodwater Retention B-2 plays a crucial role in mitigating the impact of potential flooding events in the region.
This high-hazard potential dam has a satisfactory condition assessment as of October 2019 and undergoes inspection every three years to ensure its structural integrity and functionality. Though it lacks a spillway, Floodwater Retention B-2 is equipped with emergency action plans and meets regulatory guidelines to manage potential risks effectively. With its strategic location and design, this dam serves as a vital infrastructure for flood risk reduction in Wellington, Colorado, and highlights the importance of water resource management in the face of changing climate dynamics.
As climate change continues to influence weather patterns and increase the frequency of extreme precipitation events, the role of dams like Floodwater Retention B-2 becomes even more significant in safeguarding communities and ecosystems from the impacts of flooding. With its substantial storage capacity and effective risk management measures, this earth dam stands as a testament to the collaborative efforts of government agencies and private stakeholders in ensuring water resource resilience in the face of a changing climate.
Year Completed |
1982 |
Dam Length |
5420 |
Dam Height |
56 |
River Or Stream |
BOXELDER CREEK |
Primary Dam Type |
Earth |
Surface Area |
457 |
Hydraulic Height |
56 |
Drainage Area |
111 |
Nid Storage |
12005 |
Structural Height |
66 |
Hazard Potential |
High |
Nid Height |
66 |
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-2
Lower North Fork
Filter Plant