Shell Rock Milldam
Key Takeaway
Shell Rock Milldam is classified as low hazard in Iowa. It was completed in 1928 and is 98 years old. Its primary use is recreation.
Physical Details
| Dam Height | 7 ft |
| Dam Length | 221 ft |
| Dam Type | Rockfill |
| Max Storage | 229 acre-ft |
| Normal Storage | 152 acre-ft |
| Surface Area | 45 acres |
| Drainage Area | 1,752 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1928 (98 years old) |
| NID ID | IA01293 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Shell Rock River Imp Comp
Local Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Shell Rock Milldam?
Shell Rock Milldam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Shell Rock Milldam?
Shell Rock Milldam is owned by Shell Rock River Imp Comp (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Shell Rock Milldam built?
Shell Rock Milldam was completed in 1928, making it 98 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Shell Rock Milldam?
Shell Rock Milldam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Shell Rock Milldam?
Shell Rock Milldam has a dam height of 7 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Shell Rock Milldam last inspected?
Shell Rock Milldam was last inspected on September 22, 1989. Inspection dates indicate when a formal review occurred, not the results of that inspection.