Leonard Thomas Reservoir
Leonard Thomas Reservoir is an earth dam located in Pitkin County, Colorado, built in 1964. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Leonard Thomas Reservoir
The primary purpose of Leonard Thomas Reservoir is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Aspen (hornbacher, David) (local government). It impounds the Castle Creek-os near Aspen.
The dam stands 21 feet tall and stretches 280 feet across, creates a reservoir covering 1 acres, and has a maximum storage capacity of 13 acre-feet. Completed in 1964, the structure is well into its service life at over 50 years 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 05/05/2021.
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Location
| State | Colorado |
| County | Pitkin |
| Nearest City | Aspen |
| River/Stream | Castle Creek-os |
| Coordinates | 39.18557, -106.83918 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 19 ft |
| Dam Length | 280 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 13 acre-ft |
| Max Storage | 13 acre-ft |
| Normal Storage | 10 acre-ft |
| Surface Area | 1 acres |
| Max Discharge | 207 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF ASPEN (HORNBACHER, DAVID) |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/05/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02550 |
| Federal ID | CO02550 |
| More Info | State Dam Safety Program |