Cattail #1

BIG THOMPSON RIVER-TR· Larimer, Colorado· Built 1966· Earth· 10 ft tall
Low Hazard Flood Risk Reduction Private

Key Takeaway

Cattail #1 is classified as low hazard in Colorado. It was completed in 1966 and is 60 years old. Its primary use is flood risk reduction.

Physical Details

Dam Height 10 ft (taller than 4.4% in CO)
Dam Length1,172 ft
Dam TypeEarth
Max Storage91 acre-ft
Normal Storage73 acre-ft
Surface Area19 acres
Drainage Area1 sq mi
Max Discharge5,733 cfs
Year Completed1966 (60 years old)
NID IDCO00160

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: October 23, 2001
State Regulated: Yes
Regulatory Agency: DWR

Ownership

GLEN DEVELOPMENT, LLC (SCOTT BRAY)

Private

Nearby Dams

Cattail Pond

Larimer, CO

Low Hazard 7 ft

Mariano

Larimer, CO

High Hazard 30 ft

South Side

Larimer, CO

Significant Hazard 31 ft

Ryan Gulch

Larimer, CO

Significant Hazard 36 ft

Rist - Benson

Larimer, CO

High Hazard 15 ft

George Rist

Larimer, CO

Significant Hazard 17 ft

Lon Hagler

Larimer, CO

High Hazard 60 ft

Lone Tree

Larimer, CO

Significant Hazard 29 ft

Frequently Asked Questions

What is the hazard classification of Cattail #1?

Cattail #1 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 Cattail #1?

Cattail #1 is owned by GLEN DEVELOPMENT, LLC (SCOTT BRAY) (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Cattail #1 built?

Cattail #1 was completed in 1966, making it 60 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 Cattail #1?

Cattail #1 serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Cattail #1?

Cattail #1 has a dam height of 10 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 Cattail #1 last inspected?

Cattail #1 was last inspected on October 23, 2001. 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.