Neff Lake Reservoir Report

Last Updated: December 5, 2025

Neff Lake, located in Weld County, Colorado, is a privately owned irrigation reservoir along the Cache La Poudre River.


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Summary

This Earth dam structure stands at 10 feet tall and stretches 818 feet in length, providing a storage capacity of 300 acre-feet for irrigation purposes. With a surface area of 45 acres and a drainage area of 42 square miles, Neff Lake plays a crucial role in supporting agricultural activities in the region.

Although last inspected in 1991 and deemed to have a low hazard potential, Neff Lake is considered to have a high risk level, signaling the need for continued monitoring and risk management measures. While the dam's condition assessment is currently not rated, the reservoir's emergency action plan status and risk assessment are also unclear. Despite these uncertainties, Neff Lake remains a significant water resource in the area, contributing to the agricultural landscape and water management efforts along the Cache La Poudre River.

As a key component of the region's water infrastructure, Neff Lake serves as a vital resource for irrigation and supports the local agricultural community. With its location in a high-risk area, it is imperative for stakeholders and regulatory agencies to prioritize the safety and maintenance of this reservoir to ensure its continued functionality and resilience in the face of potential climate challenges.

Dam Length

818

Dam Height

10

River Or Stream

CACHE LA POUDRE RIVER

Primary Dam Type

Earth

Surface Area

45

Hydraulic Height

10

Drainage Area

42

Nid Storage

300

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.