Coon Creek #2 Reservoir Report

Last Updated: December 5, 2025

Coon Creek #2, also known as Middle Griffith Lake, is a privately owned irrigation and recreational dam located in Mesa, Colorado.


°F

°F

mph

Wind

%

Humidity

Summary

Constructed in 1900, this earth dam stands at a height of 12 feet and has a length of 373 feet, creating a reservoir with a storage capacity of 313 acre-feet. The dam serves primarily for irrigation purposes but also offers recreational opportunities for visitors in the area.

Despite being classified as low hazard potential and in fair condition as of the last inspection in July 2018, Coon Creek #2 poses a moderate risk due to its age and the need for regular maintenance and assessment. The dam features a slide (sluice gate) outlet gate and an uncontrolled spillway with a width of 16 feet. With its stone core and rock and soil foundations, the structure requires ongoing attention to ensure its continued functionality and safety.

Located along Coon Creek in Mesa, Colorado, this dam contributes to the local water resource management and supports agricultural activities in the region. With state regulation and inspection in place, Coon Creek #2 remains a key infrastructure for water supply and recreational enjoyment, showcasing the blending of human intervention with natural landscapes in the management of water resources and climate considerations.

Year Completed

1900

Dam Length

373

Dam Height

12

River Or Stream

COON CREEK

Primary Dam Type

Earth

Surface Area

36

Hydraulic Height

12

Nid Storage

313

Structural Height

12

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Rock, Soil

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.