Coralville Milldam
Key Takeaway
Coralville Milldam is classified as low hazard in Iowa. It was completed in 1880 and is 146 years old. Its primary use is recreation.
Physical Details
| Dam Height | 13 ft (taller than 3.8% in IA) |
| Dam Length | 295 ft |
| Dam Type | Gravity |
| Max Storage | 758 acre-ft |
| Normal Storage | 599 acre-ft |
| Surface Area | 90 acres |
| Drainage Area | 3,271 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1880 (146 years old) |
| NID ID | IA01275 |
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
Johnson County Conservation Board
Local Government
Nearby Dams
Valley View Heights Dam
Johnson, IA
Low Hazard 29 ftBrown Deer Golf Course Dam
Johnson, IA
Significant Hazard 46 ftBurlington Street Dam
Johnson, IA
Low Hazard 20 ftDovetail Estates Dam
Johnson, IA
Significant Hazard 23 ftNorth Ridge Park Dam
Johnson, IA
Low Hazard 20 ftOaknoll Dam
Johnson, IA
High Hazard 25 ftNorth Branch Ralston Creek Dam
Johnson, IA
High Hazard 37 ftCoralville Regional Detention Basin
Johnson, IA
High Hazard 23 ftFrequently Asked Questions
What is the hazard classification of Coralville Milldam?
Coralville 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 Coralville Milldam?
Coralville Milldam is owned by Johnson County Conservation Board (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Coralville Milldam built?
Coralville Milldam was completed in 1880, making it 146 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 Coralville Milldam?
Coralville 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 Coralville Milldam?
Coralville Milldam has a dam height of 13 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 Coralville Milldam last inspected?
Coralville Milldam was last inspected on June 1, 1999. Inspection dates indicate when a formal review occurred, not the results of that inspection.