Rock Creek Dam is an earth dam located in Jasper County, Iowa. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 33 ft33 ft tall and 1,500 ft long, taller than 76% 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 Creek Dam
The primary purpose of Rock Creek Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Iowa Department of Natural Resources (state). It impounds the Rock Creek near Lynnville.
The dam stands 33 feet tall and stretches 1,500 feet across, creates a reservoir covering 640 acres, has a maximum storage capacity of 13,700 acre-feet, and collects water from a drainage area of 41 square miles.
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 05/12/2021.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Iowa |
| County | Jasper |
| Nearest City | Lynnville |
| River/Stream | Rock Creek |
| Coordinates | 41.73810, -92.85380 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 1,500 ft |
Storage & Hydraulics
| NID Storage | 13,700 acre-ft |
| Max Storage | 13,700 acre-ft |
| Normal Storage | 5,500 acre-ft |
| Surface Area | 640 acres |
| Drainage Area | 41 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/12/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00537 |
| Federal ID | IA00537 |
| More Info | State Dam Safety Program |