Rock Lake

NORTH WHEATLAND CREEK· Platte, Wyoming· Built 1930· Earth· 15 ft tall
Low Hazard Irrigation Private

Key Takeaway

Rock Lake is classified as low hazard in Wyoming. It was completed in 1930 and is 96 years old. Its primary use is irrigation.

Physical Details

Dam Height 15 ft (taller than 10.6% in WY)
Dam Length660 ft
Dam TypeEarth
Max Storage334 acre-ft
Normal Storage250 acre-ft
Surface Area37 acres
Drainage Area0 sq mi
Max Discharge0 cfs
Year Completed1930 (96 years old)
NID IDWY00033

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 6, 2020
State Regulated: Yes
Regulatory Agency: SEO

Ownership

WHEATLAND IRRIGATION DISTRICT

Private

Nearby Dams

Wyoming Development Company No. 1

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Significant Hazard 45 ft

Utter

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Low Hazard 30 ft

O Bar O No. 3

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Low Hazard 33 ft

Bagley Brothers

Platte, WY

Low Hazard 35 ft

Ryff and Klassert

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Low Hazard 29 ft

Chug Springs

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Low Hazard 24 ft

Wheatland Wastewater Lagoon 1

Platte, WY

Low Hazard 20 ft

Wheatland Waste Water Lagoon 2

Platte, WY

Low Hazard 18 ft

Frequently Asked Questions

What is the hazard classification of Rock Lake?

Rock Lake 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 Rock Lake?

Rock Lake is owned by WHEATLAND IRRIGATION DISTRICT (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Rock Lake built?

Rock Lake was completed in 1930, making it 96 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 Rock Lake?

Rock Lake 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 Rock Lake?

Rock Lake has a dam height of 15 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 Rock Lake last inspected?

Rock Lake was last inspected on May 6, 2020. 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.