Jasper Reservoir Report

Last Updated: December 4, 2025

Located in Boulder, Colorado, the Jasper dam on Jasper Creek serves as a critical water supply structure built in 1988 with a primary purpose of water supply.


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Summary

This privately owned Rockfill dam stands at a height of 18 feet and has a storage capacity of 426 acre-feet, providing water for various purposes in the region. With a surface area of 28 acres and a spillway width of 45 feet, the dam has a high hazard potential but is currently in satisfactory condition as of the last inspection in August 2020.

Managed by the Colorado Department of Water Resources, the Jasper dam is regulated, permitted, inspected, and enforced by the state agency to ensure its safety and compliance with regulations. The dam has a moderate risk assessment rating of 3, indicating the need for ongoing risk management measures. While the dam has not been significantly modified over the years, its emergency action plan and inundation maps are crucial components for preparedness in case of emergencies, although their last updates are pending.

Jasper dam plays a vital role in water resource management in the region, providing a reliable water supply for Eldora and surrounding areas. With its strategic location and design features, the dam serves as a key infrastructure for water storage and distribution, highlighting the importance of sustainable water resource management amidst changing climate conditions. For water resource and climate enthusiasts, Jasper dam presents an intriguing case study of infrastructure resilience and adaptation in the face of evolving environmental challenges.

Year Completed

1988

Dam Length

190

Dam Height

18

River Or Stream

JASPER CREEK

Primary Dam Type

Rockfill

Surface Area

28

Hydraulic Height

18

Nid Storage

426

Structural Height

18

Hazard Potential

High

Nid Height

18
       
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.