Jasper
Jasper is a rockfill dam located in Boulder County, Colorado, built in 1988. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Jasper
The primary purpose of Jasper 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 Zoma Holdings (private). It impounds the Jasper Creek near Eldora.
The dam stands 18 feet tall and stretches 190 feet across, creates a reservoir covering 28 acres, and has a maximum storage capacity of 426 acre-feet. Completed in 1988, the structure is 38 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 06/27/2022.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Colorado dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Colorado |
| County | Boulder |
| Nearest City | Eldora |
| River/Stream | Jasper Creek |
| Coordinates | 39.97495, -105.66055 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 190 ft |
| Year Completed | 1988 (38 years old) |
Storage & Hydraulics
| NID Storage | 426 acre-ft |
| Max Storage | 426 acre-ft |
| Normal Storage | 325 acre-ft |
| Surface Area | 28 acres |
| Max Discharge | 850 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | ZOMA HOLDINGS |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/27/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00230 |
| Federal ID | CO00230 |
| More Info | State Dam Safety Program |