Upper Stonewall
Upper Stonewall is an earth dam located in Larimer County, Colorado, built in 1910. It carries a Low hazard potential classification.
About Upper Stonewall
The primary purpose of Upper Stonewall is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by J. Evan Roberts (private). It impounds the N Fork Cache La Poudre near Fort Collins.
The dam stands 10 feet tall and stretches 470 feet across, creates a reservoir covering 9 acres, and has a maximum storage capacity of 65 acre-feet. Completed in 1910, 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.
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Location
| State | Colorado |
| County | Larimer |
| Nearest City | Fort Collins |
| River/Stream | N Fork Cache La Poudre |
| Coordinates | 40.82168, -105.25390 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 470 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 65 acre-ft |
| Max Storage | 65 acre-ft |
| Normal Storage | 47 acre-ft |
| Surface Area | 9 acres |
| Max Discharge | 125 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | J. EVAN ROBERTS |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO02042 |
| Federal ID | CO02042 |
| More Info | State Dam Safety Program |