Twin Valley Lakes - East Dam
Twin Valley Lakes - East Dam is an earth dam located in Johnson County, Iowa, built in 1965. It carries a Significant hazard potential classification and has a poor condition assessment.
About Twin Valley Lakes - East Dam
Twin Valley Lakes - East Dam is a dam in Johnson, Iowa. The dam is owned by Lori Pike,twin Valley Lakes Association (private). It impounds the Tr- Iowa River near Coralville Reservoir.
The dam stands 50 feet tall and stretches 500 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 392 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 10/24/2022.
At 50 feet, this dam is taller than 93% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Iowa |
| County | Johnson |
| Nearest City | Coralville Reservoir |
| River/Stream | Tr- Iowa River |
| Coordinates | 41.81250, -91.62200 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 50 ft |
| Dam Height | 50 ft |
| Dam Length | 500 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 392 acre-ft |
| Max Storage | 392 acre-ft |
| Normal Storage | 192 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Owner | Lori Pike,Twin Valley Lakes Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 10/24/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA03528 |
| Federal ID | IA03528 |
| More Info | State Dam Safety Program |