East Portal Dam
East Portal Dam is an earth dam located in Larimer County, Colorado, built in 1947. It carries a High hazard potential classification.
About East Portal Dam
East Portal Dam is a dam in Larimer, Colorado. The dam is owned by Bureau Of Reclamation (federal). It impounds the Wind River.
The dam stands 76 feet tall and stretches 245 feet across, creates a reservoir covering 2 acres, and collects water from a drainage area of 4 square miles. Completed in 1947, the structure is well-established, with more than 75 years of service.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/05/2020.
At 76 feet, this dam is taller than 97% 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 | Larimer |
| River/Stream | Wind River |
| Coordinates | 40.32800, -105.57800 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 76 ft |
| Dam Length | 245 ft |
| Year Completed | 1947 (79 years old) |
Storage & Hydraulics
| Surface Area | 2 acres |
| Drainage Area | 4 sq mi |
| Spillway Type | None |
Ownership & Safety
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 08/05/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02363 |
| Federal ID | CO02363 |
| More Info | State Dam Safety Program |