Prospect
Prospect is an earth dam located in Weld County, Colorado, built in 1914. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Prospect
The primary purpose of Prospect is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Henrylyn Irrigation District (private). It impounds the Lost Creek-tr near Roggen.
The dam stands 45 feet tall and stretches 5,301 feet across, creates a reservoir covering 398 acres, has a maximum storage capacity of 9,299 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1914, 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 06/18/2021.
At 45 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Colorado |
| County | Weld |
| Nearest City | Roggen |
| River/Stream | Lost Creek-tr |
| Coordinates | 40.01777, -104.50859 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 44 ft |
| Dam Length | 5,301 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 9,299 acre-ft |
| Max Storage | 9,299 acre-ft |
| Normal Storage | 6,368 acre-ft |
| Surface Area | 398 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 14,700 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | HENRYLYN IRRIGATION DISTRICT |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/18/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO01106 |
| Federal ID | CO01106 |
| More Info | State Dam Safety Program |