Lake Grant Reservoir Report

Last Updated: December 5, 2025

Lake Grant, located in Gunnison, Colorado, is a vital water supply structure managed by the public utility in SKYLAND METRO.


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Summary

Completed in 1995, this earth dam stands at 17 feet high with a hydraulic height of 15 feet and a structural height of 21 feet. With a storage capacity of 379 acre-feet and a surface area of 22 acres, Lake Grant serves as a critical resource for water storage and supply in the region. Despite its high hazard potential, the dam is currently in a satisfactory condition and undergoes regular inspections to ensure its safety and functionality.

Managed by the Department of Water Resources (DWR) in Colorado, Lake Grant is regulated and permitted by the state authorities to ensure its compliance with safety standards. The dam, situated along the Slate River-TR, has a maximum discharge capacity of 903 cubic feet per second and is equipped with slide and uncontrolled outlet gates. Additionally, the dam lacks a spillway, which poses a potential risk during high water events. With its risk assessment categorized as high and a hazard potential of 2, Lake Grant is closely monitored and managed to mitigate any potential risks and ensure the safety of the surrounding communities.

With its primary purpose being water supply, Lake Grant plays a crucial role in meeting the water needs of the region. As a significant infrastructure for water resource management, the dam provides essential storage capacity and support for various water-related activities. The dam's satisfactory condition, regular inspections, and compliance with state regulations highlight its importance in ensuring a reliable and sustainable water supply for the residents of Gunnison, Colorado.

Year Completed

1995

Dam Length

435

Dam Height

17

River Or Stream

SLATE RIVER-TR

Primary Dam Type

Earth

Surface Area

22

Hydraulic Height

15

Nid Storage

379

Structural Height

21

Outlet Gates

Slide (sluice gate), Uncontrolled

Hazard Potential

High

Foundations

Soil

Nid Height

21
       
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.