D.o.e. Rocky Flats A-4 is an earth dam located in Jefferson County, Colorado, built in 1979. It carries a Low hazard potential classification.
Dam profile
NID height · 54 ft54 ft tall and 1,050 ft long, taller than 94% 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 D.o.e. Rocky Flats A-4
The primary purpose of D.o.e. Rocky Flats A-4 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 Doe Legacy Management (federal). It impounds the North Walnut Creek near Westminster.
The dam stands 54 feet tall and stretches 1,050 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 160 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1979, the structure is 47 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 10/20/2011. That was over 14 years ago.
At 54 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Colorado |
| County | Jefferson |
| Nearest City | Westminster |
| River/Stream | North Walnut Creek |
| Coordinates | 39.90000, -105.18250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Height | 40 ft |
| Dam Length | 1,050 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 160 acre-ft |
| Max Storage | 160 acre-ft |
| Normal Storage | 99 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 6,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Doe Legacy Management |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/20/2011 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO02243 |
| Federal ID | CO02243 |
| More Info | State Dam Safety Program |