Jones #1 Reservoir Report

Last Updated: December 5, 2025

Jones #1 is a historic earth dam located in Kremmling, Colorado, along the Sheep Creek-TR river.


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Summary

Built in 1879 for water supply purposes, this dam stands at 27 feet high and spans 340 feet in length, with a storage capacity of 295 acre-feet. It serves multiple functions including fire protection, stock watering, irrigation, and small fish pond maintenance, making it a crucial resource for the local community.

Despite its age, Jones #1 is in satisfactory condition according to its last inspection in September 2018, with a significant hazard potential due to its location and structural design. The dam features an uncontrolled spillway and a slide gate outlet, demonstrating its historical significance and engineering ingenuity. With a moderate risk assessment rating and regular inspection schedule, Jones #1 remains a vital water infrastructure asset in Grand County, Colorado, highlighting the importance of maintaining and monitoring aging dams for water resource and climate enthusiasts.

Years Modified

1966 - Structural

Year Completed

1879

Dam Length

340

Dam Height

27

River Or Stream

SHEEP CREEK-TR

Primary Dam Type

Earth

Surface Area

18

Hydraulic Height

27

Drainage Area

1

Nid Storage

295

Structural Height

27

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

27
       
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.