Rock Valley Lake Dam is an earth dam located in Wayne County, Iowa, built in 2008. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 39 ft39 ft tall and 765 ft long, taller than 85% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Rock Valley Lake Dam
The primary purpose of Rock Valley Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Darrell Coddington,roger Winslow (private). It impounds the Tr- South Fork Chariton River near Tr- Rathbun Reservoir.
The dam stands 39 feet tall and stretches 765 feet across, creates a reservoir covering 62 acres, has a maximum storage capacity of 1,232 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 2008, the structure is relatively new.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 09/11/2024.
At 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Iowa |
| County | Wayne |
| Nearest City | Tr- Rathbun Reservoir |
| River/Stream | Tr- South Fork Chariton River |
| Coordinates | 40.77200, -93.38450 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 765 ft |
| Year Completed | 2008 (18 years old) |
Storage & Hydraulics
| NID Storage | 1,232 acre-ft |
| Max Storage | 1,232 acre-ft |
| Normal Storage | 759 acre-ft |
| Surface Area | 62 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Darrell Coddington,roger Winslow |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/11/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA03900 |
| Federal ID | IA03900 |
| More Info | State Dam Safety Program |