Crescent Lake #1 Reservoir Report

Last Updated: December 5, 2025

Crescent Lake #1, located in Garfield, Colorado, is a privately owned rockfill dam constructed in 1935 for irrigation purposes.


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Summary

The dam stands at a height of 13 feet and has a storage capacity of 384 acre-feet, with a normal storage level of 237 acre-feet. The dam is situated on the SOUTH FORK DERBY CR, with a drainage area of 1 square mile.

Although the dam has a low hazard potential and is currently in fair condition, it is subject to state regulation, inspection, and enforcement to ensure its safety and compliance with regulations. The spillway, of uncontrolled type, has a width of 124 feet to manage maximum discharge of 1205 cubic feet per second. The dam's emergency action plan status and risk assessment are currently under review, with moderate risk identified.

Crescent Lake #1 serves as a significant water resource in the area, providing irrigation water to support agricultural activities. With its historical significance and moderate risk profile, the dam represents a vital infrastructure for water management in the region, warranting continued monitoring and maintenance to ensure its long-term functionality and safety.

Year Completed

1935

Dam Length

300

Dam Height

13

River Or Stream

SOUTH FORK DERBY CR

Primary Dam Type

Rockfill

Surface Area

34

Hydraulic Height

12

Drainage Area

1

Nid Storage

384

Structural Height

13

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

13
       
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.