Pine Brook Reservoir Report

Last Updated: December 4, 2025

Pine Brook is a privately owned dam located in Boulder, Colorado, serving as a critical water supply structure in the region.


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Summary

Constructed in 2006, this Roller-Compacted Concrete dam stands at a height of 84 feet and has a storage capacity of 140 acre-feet. It is designed as a Multi-Arch structure with a spillway width of 307 feet, ensuring adequate water management during peak discharge events.

Managed by the Colorado Division of Water Resources, Pine Brook has a high hazard potential but is currently assessed as being in satisfactory condition. Regular inspections ensure its structural integrity and operational effectiveness, with a moderate risk rating. The dam plays a vital role in water resource management for the area, supporting the needs of residents and businesses alike.

As an essential component of the water supply infrastructure in Boulder, Pine Brook exemplifies the importance of effective dam regulation and maintenance in the face of changing climate patterns. With its strategic location on Two Mile Creek, this dam stands as a testament to sustainable water management practices and the ongoing commitment to safeguarding water resources for future generations.

Year Completed

2006

Dam Length

570

Dam Height

84

River Or Stream

TWO MILE CREEK

Primary Dam Type

Roller-Compacted Concrete

Surface Area

4

Hydraulic Height

84

Nid Storage

140

Structural Height

84

Hazard Potential

High

Foundations

Rock

Nid Height

84
       
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.