Mc Grew Brothers Dam

TR- WEST NISHNABOTNA RIVER· Mills, Iowa· Built 2001· Earth· 35 ft tall

Key Takeaway

Mc Grew Brothers Dam is classified as low hazard in Iowa. It was completed in 2001 and is 25 years old. Its primary use is fire protection.

Physical Details

Dam Height 35 ft (taller than 70.9% in IA)
Dam Length545 ft
Dam TypeEarth
Max Storage98 acre-ft
Normal Storage29 acre-ft
Surface Area6 acres
Drainage Area1 sq mi
Max Discharge0 cfs
Year Completed2001 (25 years old)
NID IDIA03732

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

McGrew Brothers

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Mc Grew Brothers Dam?

Mc Grew Brothers 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 Mc Grew Brothers Dam?

Mc Grew Brothers Dam is owned by McGrew Brothers (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Mc Grew Brothers Dam built?

Mc Grew Brothers Dam was completed in 2001, making it 25 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 Mc Grew Brothers Dam?

Mc Grew Brothers 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 Mc Grew Brothers Dam?

Mc Grew Brothers Dam has a dam height of 35 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.