Weir And Johnson Reservoir Report

Last Updated: December 5, 2025

Weir and Johnson, located in Cedaredge, Colorado, is a privately owned earth dam that was completed in 1974 for the primary purpose of recreation.


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Summary

The dam stands at a height of 21 feet and has a hydraulic height of 23 feet, providing a storage capacity of 860 acre-feet with a maximum discharge of 425 cubic feet per second. The dam, situated on the Surface Creek-TR river or stream, covers a surface area of 45 acres and has a spillway type of uncontrolled with a width of 6 feet.

The condition assessment of Weir and Johnson is rated as fair, with a hazard potential classified as high. The dam is regulated by the Colorado Department of Water Resources and is subject to state permitting, inspection, and enforcement. Despite its moderate risk level, the dam has not been modified in recent years and has not had an emergency action plan (EAP) updated since March 2020. With its picturesque location and recreational opportunities, Weir and Johnson serves as both a vital water resource and a potential area of concern for climate enthusiasts monitoring dam safety and management in the region.

Year Completed

1974

Dam Length

167

Dam Height

21

River Or Stream

SURFACE CREEK-TR

Primary Dam Type

Earth

Surface Area

45

Hydraulic Height

23

Nid Storage

860

Structural Height

23

Outlet Gates

Slide (sluice gate), Uncontrolled

Hazard Potential

High

Foundations

Soil

Nid Height

23
       
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.