Island Park Dike
Island Park Dike is an earth dam located in Fremont County, Idaho, built in 1938. It carries a High hazard potential classification.
About Island Park Dike
Island Park Dike is a dam in Fremont, Idaho. The dam is owned by Bureau Of Reclamation (federal). It impounds the Henrys Fork.
The dam stands 12 feet tall and stretches 7,870 feet across, and has a maximum storage capacity of 169,646 acre-feet. Completed in 1938, 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 07/14/2020.
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 Idaho 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 | Idaho |
| County | Fremont |
| River/Stream | Henrys Fork |
| Coordinates | 44.42120, -111.39150 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 7,870 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 169,646 acre-ft |
| Max Storage | 169,646 acre-ft |
| Normal Storage | 127,646 acre-ft |
| Spillway Type | Controlled |
Ownership & Safety
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 07/14/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ID00272 |
| Federal ID | ID00272S001 |
| More Info | State Dam Safety Program |