Simon #1 Reservoir Report

Last Updated: December 5, 2025

Simon #1, also known as Crosho, is a privately owned irrigation dam located in Oak Creek, Colorado.


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Summary

Completed in 1917, this earth dam stands at a height of 27 feet and has a storage capacity of 1,696 acre-feet, making it an essential water resource for the area. The dam controls the Middle Hunt Creek-OS river and has a spillway width of 12 feet.

Managed by the Colorado Department of Water Resources, Simon #1 is subject to state regulation, inspection, and enforcement to ensure its safety and functionality. Despite being classified as having a low hazard potential and fair condition assessment, the dam is monitored regularly, with the last inspection taking place in June 2014. With a moderate risk assessment rating, measures are in place to manage any potential risks associated with the dam.

For water resource and climate enthusiasts, Simon #1 offers a fascinating glimpse into the history and infrastructure of water management in Colorado. Its role in irrigation and water storage highlights the importance of maintaining and regulating such structures to ensure the sustainable use of water resources in the region.

Year Completed

1917

Dam Length

1050

Dam Height

27

River Or Stream

MIDDLE HUNT CREEK-OS

Primary Dam Type

Earth

Surface Area

100

Hydraulic Height

22

Drainage Area

1

Nid Storage

1696

Structural Height

27

Outlet Gates

Slide (sluice gate) - 0

Hazard Potential

Low

Nid Height

27
       
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.