Twelve Mile Creek Watershed Site D-35

TR- TWELVE MILE CREEK· Union, Iowa· Built 1988· Earth· 38 ft tall
Low Hazard Fire Protection Stock Or Small Fish Pond Flood Risk Reduction Local Government

Key Takeaway

Twelve Mile Creek Watershed Site D-35 is classified as low hazard in Iowa. It was completed in 1988 and is 38 years old. Its primary use is fire protection.

Physical Details

Dam Height 38 ft (taller than 80.1% in IA)
Dam Length825 ft
Dam TypeEarth
Max Storage530 acre-ft
Normal Storage140 acre-ft
Surface Area20 acres
Drainage Area2 sq mi
Max Discharge0 cfs
Year Completed1988 (38 years old)
NID IDIA02490

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
State Regulated: Yes
Regulatory Agency: IOWA DNR

Ownership

Union County SWCD

Local Government

Nearby Dams

Twelve Mile Creek Watershed Site 35-2

Union, IA

Low Hazard 30 ft

Twelve Mile Creek Watershed Site 36

Union, IA

Low Hazard 31 ft

Twelve Mile Creek Watershed Site 27

Union, IA

Low Hazard 31 ft

Twelve Mile Creek Watershed Site 40-1

Union, IA

Low Hazard 33 ft

Ridinger Dam

Union, IA

Low Hazard 27 ft

Twelve Mile Creek Watershed Site 23

Union, IA

Low Hazard 33 ft

Twelve Mile Creek Watershed Site D-41-A-5

Union, IA

Low Hazard 36 ft

Hayes Cattle Company Dam

Union, IA

Low Hazard 29 ft

Frequently Asked Questions

What is the hazard classification of Twelve Mile Creek Watershed Site D-35?

Twelve Mile Creek Watershed Site D-35 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 Twelve Mile Creek Watershed Site D-35?

Twelve Mile Creek Watershed Site D-35 is owned by Union County SWCD (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Twelve Mile Creek Watershed Site D-35 built?

Twelve Mile Creek Watershed Site D-35 was completed in 1988, making it 38 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 Twelve Mile Creek Watershed Site D-35?

Twelve Mile Creek Watershed Site D-35 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 Twelve Mile Creek Watershed Site D-35?

Twelve Mile Creek Watershed Site D-35 has a dam height of 38 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.