Miller Dam

TR-KNAPP CREEK· Johnson, Iowa· Built 1971· Earth· 29 ft tall

Key Takeaway

Miller Dam is classified as low hazard in Iowa. It was completed in 1971 and is 55 years old. Its primary use is fire protection.

Physical Details

Dam Height 29 ft (taller than 42.8% in IA)
Dam Length442 ft
Dam TypeEarth
Max Storage99 acre-ft
Normal Storage57 acre-ft
Surface Area7 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1971 (55 years old)
NID IDIA01325

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: May 11, 1980
State Regulated: Yes
Regulatory Agency: IOWA DNR

Ownership

Verne E Miller

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Miller Dam?

Miller Dam 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 Miller Dam?

Miller Dam is owned by Verne E Miller (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Miller Dam built?

Miller Dam was completed in 1971, making it 55 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 Miller Dam?

Miller Dam serves the following purposes: Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Miller Dam?

Miller Dam has a dam height of 29 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 Miller Dam last inspected?

Miller Dam was last inspected on May 11, 1980. 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.