Gill Reservoir Reservoir Report

Last Updated: December 5, 2025

Gill Reservoir, located in Routt County, Colorado, is a federally owned water structure managed by the Bureau of Land Management.


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Summary

This reservoir serves multiple purposes including fire protection, stock watering, and as a small fish pond. With a capacity of 80 acre-feet and a surface area of 80 acres, it provides a crucial water source for the surrounding area.

Constructed as a gravity dam with a height of 25 feet and a hydraulic height of 21 feet, Gill Reservoir has a low hazard potential and is not currently rated in terms of condition assessment. The last inspection was conducted in August 2011, with an inspection frequency of 5 years. While the dam has not been modified in recent years, it meets state regulatory standards for permitting, inspection, and enforcement.

Despite being relatively small in size, Gill Reservoir plays a significant role in water resource management and climate resilience in the region. As climate change continues to impact water availability and quality, the importance of well-maintained reservoirs like Gill in providing essential water services for both human and ecological needs cannot be overstated.

Dam Length

450

River Or Stream

EAST FORK WILLIAMS FORK - TR

Primary Dam Type

Gravity

Surface Area

80

Hydraulic Height

21

Nid Storage

80

Structural Height

25

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

25
       
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.