Silver Jack Reservoir Reservoir Report

Last Updated: December 4, 2025

Silver Jack Reservoir is located in the San Juan Mountains of Colorado and was established in 1957.


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Summary

The reservoir is fed by the snowpack from the surrounding mountains and provides water for irrigation, recreation, and domestic use. The hydrology of the reservoir is primarily determined by the drainage basin and precipitation patterns in the area. The surface flow providers include the Cow Creek and Dallas Creek, while the snowpack providers include the San Juan, Sneffels, and Cimarron Mountains. The reservoir is used for fishing, boating, camping, and hiking, making it a popular destination for outdoor enthusiasts. Additionally, it irrigates agricultural lands in the Uncompahgre Valley, supporting the local farming community.

Reservoir Details

Storage 24hr Change -0.22%
Percent of Normal 41%
Minimum 481.05 acre-ft
2025-09-29
Maximum 4,010,926.07 acre-ft
2022-01-15
Average 4,058 acre-ft
Nid_Height 173
Hydraulic_Height 132
Primary_Dam_Type Earth
Drainage_Area 59
Year_Completed 1971
Dam_Height 173
Structural_Height 173
River_Or_Stream EAST FORK, CIMARRON RIVER
Foundations Rock
Surface_Area 319
Hazard_Potential High
Outlet_Gates Slide (sluice gate), Uncontrolled, Valve
Nid_Storage 15363
Dam_Length 1050
       
Seasonal Comparison
Storage Levels
Storage Levels
Pool Elevation Levels
Total Release Levels
Inflow Levels

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.