Winslow Reservoir Report

Last Updated: December 5, 2025

Winslow is a private recreational dam located in Routt County, Colorado, specifically in the city of Toponas.


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Summary

Built in 1998, Winslow stands at a height of 44 feet with a dam length of 334 feet. The primary purpose of this earth dam is for recreational activities, offering a storage capacity of 174 acre-feet and a normal storage of 103 acre-feet.

Managed by the Colorado Division of Water Resources, Winslow is regulated and inspected by the state agency to ensure its safety and compliance with regulations. With a low hazard potential and fair condition assessment, the dam poses a moderate risk, prompting the need for risk management measures. The dam's spillway type is uncontrolled, with a maximum discharge capacity of 880 cubic feet per second, and features a single slide (sluice gate) outlet gate for water release.

Overall, Winslow serves as a vital water resource for the local community, providing both recreational opportunities and essential storage capacity while being closely monitored for safety and compliance with state regulations. Its strategic location along King Creek-TR and its efficient design by High Country Engineers, Northwest Colorado Consultants, and USDA NRCS make it a noteworthy structure for water resource and climate enthusiasts to study and appreciate.

Year Completed

1998

Dam Length

334

Dam Height

33

River Or Stream

KING CREEK-TR

Primary Dam Type

Earth

Surface Area

12

Hydraulic Height

33

Drainage Area

1

Nid Storage

174

Structural Height

44

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

44
       
Seasonal Comparison

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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.