Holt Reservoir Report

Last Updated: December 5, 2025

Located in Platteville, Weld County, Colorado, Holt is a privately owned irrigation dam on Howlett Gulch that has been serving the community since its completion in 1893.


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Summary

With a dam height of 11 feet and a length of 725 feet, Holt has a storage capacity of 279 acre-feet, providing essential water resources for irrigation in the area. Despite its age, the dam has a low hazard potential and has not been rated for its current condition.

Managed by the Colorado Department of Water Resources, Holt is regulated, permitted, inspected, and enforced by the state, ensuring its safety and compliance with regulations. Although the dam has not been modified in recent years, it is equipped with spillway width of 4 feet and has a maximum discharge of 10 cubic feet per second. The risk assessment for Holt indicates a high risk level of 2, highlighting the need for continued monitoring and maintenance to mitigate potential hazards and ensure the safety of the surrounding community and environment.

Year Completed

1893

Dam Length

725

Dam Height

11

River Or Stream

HOWLETT GULCH

Primary Dam Type

Earth

Surface Area

18

Hydraulic Height

11

Nid Storage

279

Structural Height

11

Hazard Potential

Low

Nid Height

11
       
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.