Dolores No. 1

DOLORES DRAW· Niobrara, Wyoming· Built 1953· Earth· 27 ft tall
Low Hazard Irrigation Private

Key Takeaway

Dolores No. 1 is classified as low hazard in Wyoming. It was completed in 1953 and is 73 years old. Its primary use is irrigation.

Physical Details

Dam Height 27 ft (taller than 50.7% in WY)
Dam Length678 ft
Dam TypeEarth
Max Storage107 acre-ft
Normal Storage61 acre-ft
Surface Area8 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1953 (73 years old)
NID IDWY00767

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: June 6, 2019
State Regulated: Yes
Regulatory Agency: SEO

Ownership

TOLLMAN RANCH

Private

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Frequently Asked Questions

What is the hazard classification of Dolores No. 1?

Dolores No. 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 Dolores No. 1?

Dolores No. 1 is owned by TOLLMAN RANCH (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Dolores No. 1 built?

Dolores No. 1 was completed in 1953, making it 73 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 Dolores No. 1?

Dolores No. 1 serves the following purposes: Irrigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Dolores No. 1?

Dolores No. 1 has a dam height of 27 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 Dolores No. 1 last inspected?

Dolores No. 1 was last inspected on June 6, 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.