Annex #8
Annex #8 is an earth dam located in Larimer County, Colorado, built in 1903. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Annex #8
The primary purpose of Annex #8 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Wrcc, Inc. (nelson, Kimberly) (private). It impounds the Cache La Poudre-os near Fort Collins.
The dam stands 26 feet tall and stretches 1,960 feet across, creates a reservoir covering 179 acres, and has a maximum storage capacity of 4,385 acre-feet. Completed in 1903, 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 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 06/17/2021.
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Location
| State | Colorado |
| County | Larimer |
| Nearest City | Fort Collins |
| River/Stream | Cache La Poudre-os |
| Coordinates | 40.65022, -105.05165 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 1,960 ft |
| Year Completed | 1903 (123 years old) |
Storage & Hydraulics
| NID Storage | 4,385 acre-ft |
| Max Storage | 4,385 acre-ft |
| Normal Storage | 3,724 acre-ft |
| Surface Area | 179 acres |
| Max Discharge | 10 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | WRCC, INC. (NELSON, KIMBERLY) |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/17/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO01155 |
| Federal ID | CO01155 |
| More Info | State Dam Safety Program |