Granby Dike 2 Reservoir Report

Last Updated: December 5, 2025

Granby Dike 2, located in Grand County, Colorado, is a crucial piece of infrastructure managed by the Bureau of Reclamation for the primary purpose of hydroelectric power generation and irrigation.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1950, this earth dam stands at a height of 68 feet and has a structural height of 68 feet, with a maximum storage capacity of 539,760 acre-feet. The dam spans a length of 1,131 feet and is situated on the Colorado River, with a controlled spillway width of 40 feet to manage water flow.

With its high hazard potential and very high risk assessment rating, Granby Dike 2 is subject to regular inspections by the Bureau of Reclamation to ensure its safety and functionality. The dam is regulated by state agencies and falls under the jurisdiction of the Department of Interior's Bureau of Reclamation. In case of emergencies, an Emergency Action Plan (EAP) is in place, although its last revision was in January 2020.

This critical infrastructure plays a vital role in water resource management and climate resilience in the region, highlighting the importance of monitoring and maintaining dams like Granby Dike 2 to safeguard communities and the environment from potential risks and hazards.

Year Completed

1950

Dam Length

1131

Dam Height

68

River Or Stream

COLORADO RIVER

Primary Dam Type

Earth

Surface Area

7260

Hydraulic Height

49

Nid Storage

539760

Structural Height

68

Hazard Potential

High

Foundations

Rock

Nid Height

68
       
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.