Teller No. 2 Reservoir Report

Last Updated: December 4, 2025

Teller No.


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Summary

2, located in Boulder, Colorado, is a crucial irrigation structure built in 1904 with a primary purpose of supporting irrigation in the area. This earth dam, standing at 12 feet high and 1060 feet long, also serves additional purposes such as providing water for fish and wildlife ponds and recreation. With a storage capacity of 180 acre-feet and a surface area of 21 acres, this dam plays a vital role in maintaining water resources in the region.

Managed by the local government and regulated by the Colorado Department of Water Resources, Teller No. 2 has a low hazard potential and is assessed to be in fair condition as of its last inspection in 2014. The dam features an uncontrolled spillway with a width of 97 feet and can discharge up to 2350 cubic feet per second. Despite its moderate risk level, the structure has not been modified in recent years and is equipped to handle emergencies with an established Emergency Action Plan.

With its historical significance and ongoing role in water resource management, Teller No. 2 stands as a testament to the importance of infrastructure in supporting agriculture, wildlife conservation, and recreational activities in the region. Climate and water resource enthusiasts can appreciate the engineering behind this structure and the careful monitoring and regulatory oversight that ensure its continued safe operation for the community.

Year Completed

1904

Dam Length

1060

Dam Height

12

River Or Stream

DRY CREEK-OS

Primary Dam Type

Earth

Surface Area

21

Hydraulic Height

12

Nid Storage

180

Structural Height

12

Hazard Potential

Low

Nid Height

12
       
Seasonal Comparison

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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.