Neff Lake

CACHE LA POUDRE RIVER· Weld, Colorado· Earth· 10 ft tall
Low Hazard Irrigation Private

Key Takeaway

Neff Lake is classified as low hazard in Colorado. Its primary use is irrigation.

Physical Details

Dam Height 10 ft (taller than 4.4% in CO)
Dam Length818 ft
Dam TypeEarth
Max Storage300 acre-ft
Normal Storage100 acre-ft
Surface Area45 acres
Drainage Area42 sq mi
Max Discharge0 cfs
NID IDCO02354

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: September 25, 1991
State Regulated: Yes
Regulatory Agency: DWR

Ownership

HIGHLAND VALLEY RESERVOIR AND DITCH COMPANY (JOHNS

Private

Nearby Dams

Seeley Lake

Weld, CO

Low Hazard 18 ft

Boomerang

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Low Hazard 24 ft

Woods Lake

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Significant Hazard 26 ft

Angel Lake

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Significant Hazard 16 ft

Wykert #4

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Low Hazard 12 ft

Greeley Lake West

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Significant Hazard 22 ft

Cozzens

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Low Hazard 17 ft

Law, John

Weld, CO

Low Hazard 14 ft

Frequently Asked Questions

What is the hazard classification of Neff Lake?

Neff 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 Neff Lake?

Neff Lake is owned by HIGHLAND VALLEY RESERVOIR AND DITCH COMPANY (JOHNS (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Neff Lake?

Neff 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 Neff Lake?

Neff Lake 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 Neff Lake last inspected?

Neff Lake was last inspected on September 25, 1991. 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.