Valmont 'A' Reservoir Report

Last Updated: December 4, 2025

Valmont 'A' is a significant water supply infrastructure located in Boulder, Colorado, along the Boulder Creek-TR stream.


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Summary

Completed in 1962, this earth dam stands at a height of 67 feet, with a hydraulic height of 58 feet and a structural height of 80 feet. It serves the primary purpose of water supply for irrigation and other uses in the region, with a storage capacity of 15,950 acre-feet and a normal storage level of 11,234 acre-feet.

The dam's design includes an uncontrolled spillway with a width of 108 feet to manage maximum discharges of up to 6,752 cubic feet per second. With a hazard potential rated as high and a fair condition assessment as of November 2020, Valmont 'A' is regulated by the Colorado Department of Water Resources, with state permitting, inspection, and enforcement in place. Despite its moderate risk level, the dam holds a crucial role in maintaining water resources in the area and ensuring the safety of surrounding communities in case of emergencies.

Owned privately, Valmont 'A' is part of the water infrastructure network in Colorado, contributing to the sustainable management of water resources in the region. Its association with the Boulder Creek-TR stream highlights its significance in providing water supply for various purposes, emphasizing the importance of maintaining and monitoring its condition to ensure continued functionality and safety for the community.

Year Completed

1962

Dam Length

3614

Dam Height

67

River Or Stream

BOULDER CREEK-TR

Primary Dam Type

Earth

Surface Area

537

Hydraulic Height

58

Drainage Area

1

Nid Storage

15950

Structural Height

80

Hazard Potential

High

Nid Height

80
       
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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.