Iowa Falls Milldam

IOWA RIVER· Hardin, Iowa· Built 1925· Gravity· 26 ft tall
Low Hazard Hydroelectric Recreation Water Supply Public Utility

Key Takeaway

Iowa Falls Milldam is classified as low hazard in Iowa. It was completed in 1925 and is 101 years old. Its primary use is hydroelectric.

Physical Details

Dam Height 26 ft (taller than 24.7% in IA)
Dam Length225 ft
Dam TypeGravity
Max Storage4.8K acre-ft
Normal Storage4.8K acre-ft
Surface Area365 acres
Drainage Area679 sq mi
Max Discharge0 cfs
Year Completed1925 (101 years old)
NID IDIA01304

Safety Information

Low Hazard

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?

Emergency Action Plan: No
Last Inspection: June 2, 1999
State Regulated: Yes
Regulatory Agency: IOWA DNR

Ownership

Renewable World Energies

Public Utility

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Iowa Falls Milldam?

Iowa Falls 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 Iowa Falls Milldam?

Iowa Falls Milldam is owned by Renewable World Energies (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Iowa Falls Milldam built?

Iowa Falls Milldam was completed in 1925, making it 101 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 Iowa Falls Milldam?

Iowa Falls Milldam serves the following purposes: Hydroelectric, Recreation, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Iowa Falls Milldam?

Iowa Falls Milldam has a dam height of 26 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 Iowa Falls Milldam last inspected?

Iowa Falls Milldam was last inspected on June 2, 1999. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.