Mark #1 is an earth dam located in Rio Blanco County, Colorado, built in 1964. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 650 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Mark #1
The primary purpose of Mark #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Twin Buttes Land Company (robertson, Owen) (private). It impounds the West Cr near Rangely.
The dam stands 22 feet tall and stretches 650 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 91 acre-feet, and collects water from a drainage area of 16 square miles. Completed in 1964, the structure is well into its service life at over 50 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. 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 09/08/2016. That was over 10 years ago.
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Location
| State | Colorado |
| County | Rio Blanco |
| Nearest City | Rangely |
| River/Stream | West Cr |
| Coordinates | 39.67834, -108.85057 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 650 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 91 acre-ft |
| Max Storage | 91 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 410 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Twin Buttes Land Company (robertson, Owen) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/08/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01934 |
| Federal ID | CO01934 |
| More Info | State Dam Safety Program |