Plaster Reservoir Report

Last Updated: December 5, 2025

Plaster is a local government-owned dam located in Broomfield, Colorado, with a primary purpose of irrigation.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1909, this earth dam stands at a height of 12 feet and has a storage capacity of 218 acre-feet. With a controlled spillway type and a width of 302 feet, Plaster has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.

Despite its age, Plaster remains regulated and inspected by the Colorado Division of Water Resources, ensuring that it meets state permitting and enforcement standards. With a risk assessment indicating a very high risk level, the dam serves as a critical infrastructure for managing water resources in the region. Although last inspected in 1988, Plaster's emergency action plan status and risk management measures are currently unspecified, highlighting the need for ongoing monitoring and maintenance to ensure its continued safety and functionality in the face of evolving climate challenges.

Year Completed

1909

Dam Length

495

Dam Height

12

River Or Stream

BIG DRY CREEK-TR

Primary Dam Type

Earth

Surface Area

14

Hydraulic Height

11

Nid Storage

218

Structural Height

12

Hazard Potential

Low

Nid Height

12
       
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.