Cornerstone Pond No. 4 is an earth dam located in Ouray County, Colorado, built in 2007. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 51 ft51 ft tall and 520 ft long, taller than 93% 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 Cornerstone Pond No. 4
The primary purpose of Cornerstone Pond No. 4 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Cornerstone Acquisition Group, LLC (private). It impounds the Cottonwood-os near Montrose.
The dam stands 51 feet tall and stretches 520 feet across, creates a reservoir covering 8 acres, and has a maximum storage capacity of 167 acre-feet. Completed in 2007, the structure is relatively new.
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 06/03/2022.
At 51 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Colorado |
| County | Ouray |
| Nearest City | Montrose |
| River/Stream | Cottonwood-os |
| Coordinates | 38.22362, -107.92240 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 51 ft |
| Dam Height | 46 ft |
| Dam Length | 520 ft |
| Year Completed | 2007 (19 years old) |
Storage & Hydraulics
| NID Storage | 167 acre-ft |
| Max Storage | 167 acre-ft |
| Normal Storage | 126 acre-ft |
| Surface Area | 8 acres |
| Max Discharge | 1,050 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Cornerstone Acquisition Group, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/03/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02921 |
| Federal ID | CO02921 |
| More Info | State Dam Safety Program |