Reynolds Reservoir Report

Last Updated: December 4, 2025

Reynolds, also known as St Marys Lake and Stewart, is a private irrigation dam located in Idaho Springs, Colorado.


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Summary

This concrete dam was completed in 1910 and stands at a height of 14 feet, with a storage capacity of 64 acre-feet. It serves the primary purpose of irrigation and has a drainage area of 0 square miles, with a maximum discharge of 38 cubic feet per second.

Managed by the Colorado Department of Water Resources, Reynolds dam is state-regulated and undergoes regular inspections, with its condition assessed as satisfactory as of September 2017. Despite its low hazard potential, the dam is categorized as having a high risk level, emphasizing the importance of effective risk management measures. With a historical significance dating back over a century, Reynolds dam remains a critical piece of infrastructure for water resource management in the region.

Located in Clear Creek County, Reynolds dam plays a vital role in water distribution and flood control along the Fall River. With its strategic location and reliable operation, the dam contributes to the overall sustainability of water resources in the area. As climate change continues to impact water availability and quality, the management and maintenance of structures like Reynolds are essential for ensuring resilience in the face of evolving environmental challenges.

Year Completed

1910

Dam Length

61

Dam Height

14

River Or Stream

FALL RIVER-TR

Primary Dam Type

Concrete

Surface Area

6

Hydraulic Height

14

Nid Storage

64

Structural Height

14

Hazard Potential

Low

Nid Height

14
       
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.