Floodwater Ret. B-6 is an earth dam located in Larimer County, Colorado, built in 1977. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 110 ft110 ft tall and 939 ft long, taller than 98% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Floodwater Ret. B-6
The primary purpose of Floodwater Ret. B-6 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by North Poudre Irr. Co. (moen, Tad) (private). It impounds the Sand Creek near Wellington.
The dam stands 110 feet tall and stretches 939 feet across, creates a reservoir covering 63 acres, has a maximum storage capacity of 1,937 acre-feet, and collects water from a drainage area of 15 square miles. Completed in 1977, the structure is 49 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/06/2022.
At 110 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | Colorado |
| County | Larimer |
| Nearest City | Wellington |
| River/Stream | Sand Creek |
| Coordinates | 40.96047, -105.17429 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 110 ft |
| Dam Height | 74 ft |
| Dam Length | 939 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 1,937 acre-ft |
| Max Storage | 1,937 acre-ft |
| Normal Storage | 1,496 acre-ft |
| Surface Area | 63 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 10,800 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | North Poudre Irr. Co. (moen, Tad) |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/06/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02238 |
| Federal ID | CO02238 |
| More Info | State Dam Safety Program |