Senac
Senac is an earth dam located in Arapahoe County, Colorado, built in 1990. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Senac
The primary purpose of Senac 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 Aurora (local government). It impounds the Senac Creek near Aurora.
The dam stands 163 feet tall and stretches 8,400 feet across, creates a reservoir covering 820 acres, has a maximum storage capacity of 40,400 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1990, the structure is 36 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 07/12/2022.
At 163 feet, this dam is taller than 99% of all dams in the United States.
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 | Arapahoe |
| Nearest City | Aurora |
| River/Stream | Senac Creek |
| Coordinates | 39.62001, -104.66557 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 163 ft |
| Dam Height | 131 ft |
| Dam Length | 8,400 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 40,400 acre-ft |
| Max Storage | 40,400 acre-ft |
| Normal Storage | 32,400 acre-ft |
| Surface Area | 820 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 9,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF AURORA |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/12/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02709 |
| Federal ID | CO02709 |
| More Info | State Dam Safety Program |