Union #2

WEIR GULCH-OS· Jefferson, Colorado· Built 1982· Earth· 17 ft tall
Low Hazard Recreation Flood Risk Reduction Local Government

Key Takeaway

Union #2 is classified as low hazard in Colorado. It was completed in 1982 and is 44 years old. Its primary use is recreation.

Physical Details

Dam Height 17 ft (taller than 26.3% in CO)
Dam Length930 ft
Dam TypeEarth
Max Storage250 acre-ft
Normal Storage55 acre-ft
Surface Area15 acres
Drainage Area0 sq mi
Max Discharge2,750 cfs
Year Completed1982 (44 years old)
NID IDCO02397

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: March 17, 1994
State Regulated: Yes
Regulatory Agency: DWR

Ownership

CITY OF LAKEWOOD - PARKS DEPT. (DZIALO, JOHN)

Local Government

Nearby Dams

Devinney

Jefferson, CO

Significant Hazard 17 ft

East

Jefferson, CO

High Hazard 18 ft

Kendrick

Jefferson, CO

Significant Hazard 5 ft

Main

Jefferson, CO

High Hazard 45 ft

Smith

Jefferson, CO

High Hazard 28 ft

Ward #1

Jefferson, CO

Low Hazard 13 ft

Carmody

Jefferson, CO

Significant Hazard 8 ft

Bear Creek No. 4

Jefferson, CO

Low Hazard 20 ft

Frequently Asked Questions

What is the hazard classification of Union #2?

Union #2 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 Union #2?

Union #2 is owned by CITY OF LAKEWOOD - PARKS DEPT. (DZIALO, JOHN) (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Union #2 built?

Union #2 was completed in 1982, making it 44 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 Union #2?

Union #2 serves the following purposes: Recreation, Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Union #2?

Union #2 has a dam height of 17 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 Union #2 last inspected?

Union #2 was last inspected on March 17, 1994. 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.