Big Pine is an earth dam located in Montezuma County, Colorado, built in 1907. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 1,370 ft long, taller than 55% of U.S. dams with a recorded height. 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 Big Pine
The primary purpose of Big Pine is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Summit Reservoir & Irrigation Company (wagner, Lau (private). It impounds the Lost Canyon-tr near Dolores.
The dam stands 26 feet tall and stretches 1,370 feet across, creates a reservoir covering 37 acres, and has a maximum storage capacity of 608 acre-feet. Completed in 1907, the structure is over a century 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 10/08/2021.
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Location
| State | Colorado |
| County | Montezuma |
| Nearest City | Dolores |
| River/Stream | Lost Canyon-tr |
| Coordinates | 37.42142, -108.31873 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 1,370 ft |
| Year Completed | 1907 (119 years old) |
Storage & Hydraulics
| NID Storage | 608 acre-ft |
| Max Storage | 608 acre-ft |
| Normal Storage | 259 acre-ft |
| Surface Area | 37 acres |
| Max Discharge | 210 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Summit Reservoir & Irrigation Company (wagner, Lau |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/08/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO01086 |
| Federal ID | CO01086 |
| More Info | State Dam Safety Program |