Six Mile - Northwest
Six Mile - Northwest is an earth dam located in Boulder County, Colorado, built in 1892. It carries a Low hazard potential classification and has a fair condition assessment.
About Six Mile - Northwest
The primary purpose of Six Mile - Northwest is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Boulder & White Rock Ditch & Reservoir Co. (grant, (private). It impounds the Little Dry Creek-tr near Boulder.
The dam stands 14 feet tall and stretches 1,750 feet across, creates a reservoir covering 124 acres, has a maximum storage capacity of 2,186 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1892, the structure is over a century 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/03/2019.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Colorado |
| County | Boulder |
| Nearest City | Boulder |
| River/Stream | Little Dry Creek-tr |
| Coordinates | 40.07057, -105.22945 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 1,750 ft |
| Year Completed | 1892 (134 years old) |
Storage & Hydraulics
| NID Storage | 2,186 acre-ft |
| Max Storage | 2,186 acre-ft |
| Normal Storage | 1,367 acre-ft |
| Surface Area | 124 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 11,552 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BOULDER & WHITE ROCK DITCH & RESERVOIR CO. (GRANT, |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/03/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO02824 |
| Federal ID | CO02824 |
| More Info | State Dam Safety Program |