Pissolio No. 1

SPRING DRAW· Weston, Wyoming· Built 1909· Earth· 45 ft tall
Low Hazard Irrigation Private

Key Takeaway

Pissolio No. 1 is classified as low hazard in Wyoming. It was completed in 1909 and is 117 years old. Its primary use is irrigation.

Physical Details

Dam Height 45 ft (taller than 91.2% in WY)
Dam Length280 ft
Dam TypeEarth
Max Storage42 acre-ft
Normal Storage42 acre-ft
Surface Area4 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1909 (117 years old)
NID IDWY02590

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: May 23, 2022
State Regulated: Yes
Regulatory Agency: SEO

Ownership

ROBERT PERINO TRUST

Private

Nearby Dams

Big Delaney

Weston, WY

Low Hazard 25 ft

V. E. Lissolo Irrigation

Weston, WY

Low Hazard 30 ft

Turner Reservoir

Weston, WY

Significant Hazard 27 ft

Black Hills Power & Light First Enlargement

Weston, WY

Low Hazard 27 ft

Frequently Asked Questions

What is the hazard classification of Pissolio No. 1?

Pissolio 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 Pissolio No. 1?

Pissolio No. 1 is owned by ROBERT PERINO TRUST (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Pissolio No. 1 built?

Pissolio No. 1 was completed in 1909, making it 117 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 Pissolio No. 1?

Pissolio 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 Pissolio No. 1?

Pissolio No. 1 has a dam height of 45 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 Pissolio No. 1 last inspected?

Pissolio No. 1 was last inspected on May 23, 2022. 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.