Mill Picayune Watershed Site M-21-5

TR-MILL CREEK· Shelby, Iowa· Built 1980· Earth· 45 ft tall

Significant Hazard Fire Protection Stock Or Small Fish Pond Flood Risk Reduction Local Government

Key Takeaway

Mill Picayune Watershed Site M-21-5 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	45 ft (taller than 91.4% in IA)
Dam Length	678 ft
Dam Type	Earth
Max Storage	354 acre-ft
Normal Storage	131 acre-ft

Surface Area	13 acres
Drainage Area	1 sq mi
Max Discharge	0 cfs
Year Completed	1980 (46 years old)
NID ID	IA02134

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

Last Inspection: July 10, 2019

State Regulated: Yes

Regulatory Agency: IOWA DNR

Ownership

Shelby County SWCD

Local Government

Nearby Dams

Mill Picayune Watershed Site M-8

Shelby, IA

Low Hazard 46 ft

Mill Picayune Watershed Site M-21-1

Shelby, IA

Significant Hazard 30 ft

Mill Picayune Watershed Site M-16-4

Shelby, IA

Low Hazard 50 ft

Mill Picayune Watershed Site M-16-2

Crawford, IA

Low Hazard 36 ft

Mill Picayune Watershed Site M-16-6

Shelby, IA

Low Hazard 44 ft

Mill Picayune Watershed Site M-18-4

Shelby, IA

Low Hazard 48 ft

Mill Picayune Watershed Site M-14-1

Shelby, IA

Low Hazard 47 ft

Mill Picayune Watershed Site M-6

Shelby, IA

Low Hazard 40 ft

Frequently Asked Questions

What is the hazard classification of Mill Picayune Watershed Site M-21-5?

Mill Picayune Watershed Site M-21-5 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-21-5?

Mill Picayune Watershed Site M-21-5 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-21-5 built?

Mill Picayune Watershed Site M-21-5 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-21-5?

Mill Picayune Watershed Site M-21-5 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-21-5?

Mill Picayune Watershed Site M-21-5 has a dam height of 45 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 Mill Picayune Watershed Site M-21-5 last inspected?

Mill Picayune Watershed Site M-21-5 was last inspected on July 10, 2019. 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.