Twombley
Twombley is an earth dam located in Weld County, Colorado, built in 1931. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Twombley
The primary purpose of Twombley is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Margaret Twombly (private). It impounds the South Platte River near Kersey.
The dam stands 13 feet tall and stretches 630 feet across, creates a reservoir covering 9 acres, and has a maximum storage capacity of 76 acre-feet. Completed in 1931, the structure is well-established, with more than 75 years of service.
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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/15/1984. That was over 41 years ago.
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Location
| State | Colorado |
| County | Weld |
| Nearest City | Kersey |
| River/Stream | South Platte River |
| Coordinates | 40.14834, -104.77890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 630 ft |
| Year Completed | 1931 (95 years old) |
Storage & Hydraulics
| NID Storage | 76 acre-ft |
| Max Storage | 76 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 9 acres |
| Max Discharge | 3,955 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | MARGARET TWOMBLY |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/15/1984 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01141 |
| Federal ID | CO01141 |
| More Info | State Dam Safety Program |