Mill Picayune Watershed Site M-21-1

TR-MILL CREEK· Shelby, Iowa· Built 1980· Earth· 30 ft tall
Significant Hazard Fire Protection Stock Or Small Fish Pond Flood Risk Reduction Local Government

Key Takeaway

Mill Picayune Watershed Site M-21-1 is classified as significant hazard in Iowa. It was completed in 1980 and is 46 years old. Its primary use is fire protection. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 30 ft (taller than 48.2% in IA)
Dam Length600 ft
Dam TypeEarth
Max Storage113 acre-ft
Normal Storage55 acre-ft
Surface Area6 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1980 (46 years old)
NID IDIA02133

Safety Information

Significant Hazard

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: No
State Regulated: Yes
Regulatory Agency: IOWA DNR

Ownership

Shelby County SWCD

Local Government

Nearby Dams

Weed Dam

Crawford, IA

Low Hazard 37 ft

Mill Picayune Watershed Site M-16-2

Crawford, IA

Low Hazard 36 ft

Mill Picayune Watershed Site M-6

Shelby, IA

Low Hazard 40 ft

Mill Picayune Watershed Site M-21-5

Shelby, IA

Significant Hazard 45 ft

Mill Picayune Watershed Site M-8

Shelby, IA

Low Hazard 46 ft

Mill Picayune Watershed Site M-27-1

Crawford, IA

Low Hazard 40 ft

Mill Picayune Watershed Site M-24-17

Shelby, IA

Significant Hazard 44 ft

Mill Picayune Watershed Site M-16-4

Shelby, IA

Low Hazard 50 ft

Frequently Asked Questions

What is the hazard classification of Mill Picayune Watershed Site M-21-1?

Mill Picayune Watershed Site M-21-1 is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Mill Picayune Watershed Site M-21-1?

Mill Picayune Watershed Site M-21-1 is owned by Shelby County SWCD (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Mill Picayune Watershed Site M-21-1 built?

Mill Picayune Watershed Site M-21-1 was completed in 1980, making it 46 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 Mill Picayune Watershed Site M-21-1?

Mill Picayune Watershed Site M-21-1 serves the following purposes: Fire Protection, Stock, Or Small Fish Pond, Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Mill Picayune Watershed Site M-21-1?

Mill Picayune Watershed Site M-21-1 has a dam height of 30 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.

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.