Shell Rock Milldam
Shell Rock Milldam is a rockfill dam located in Butler County, Iowa, built in 1928. It carries a Low hazard potential classification.
About Shell Rock Milldam
The primary purpose of Shell Rock Milldam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Shell Rock River Imp Comp (local government). It impounds the Shellrock River near Shell Rock.
The dam stands 7 feet tall and stretches 221 feet across, creates a reservoir covering 45 acres, has a maximum storage capacity of 229 acre-feet, and collects water from a drainage area of 1,752 square miles. Completed in 1928, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 09/22/1989. That was over 36 years ago.
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Location
| State | Iowa |
| County | Butler |
| Nearest City | Shell Rock |
| River/Stream | Shellrock River |
| Coordinates | 42.71190, -92.58210 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 221 ft |
| Year Completed | 1928 (98 years old) |
Storage & Hydraulics
| NID Storage | 229 acre-ft |
| Max Storage | 229 acre-ft |
| Normal Storage | 152 acre-ft |
| Surface Area | 45 acres |
| Drainage Area | 1,752 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Shell Rock River Imp Comp |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 09/22/1989 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01293 |
| Federal ID | IA01293 |
| More Info | State Dam Safety Program |