Colorado Colony Ditch Co. No. 2 Reservoir Report

Last Updated: December 5, 2025

Colorado Colony Ditch Co.


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Summary

No. 2, also known as Granger, is a private water resource infrastructure located in Big Horn, Wyoming. This irrigation system was designed by SCS and completed in 1957, serving the primary purpose of irrigation along the Peralto Ditch. The dam type is earth with stone core and soil foundations, standing at a height of 16 feet and a length of 165 feet, with a storage capacity of 254 acre-feet.

With low hazard potential and fair condition assessment, Colorado Colony Ditch Co. No. 2 is regulated by the State of Wyoming, with inspection, permitting, and enforcement processes in place by the State Engineer's Office. The dam has a spillway width of 25 feet and is equipped with a slide (sluice gate) outlet gate. While the risk assessment categorizes the structure as moderate, it continues to provide essential water resources for agricultural use in the region.

Despite being a privately owned water infrastructure, Colorado Colony Ditch Co. No. 2 plays a crucial role in sustaining the local economy and ecosystem by facilitating irrigation along the Peralto Ditch. With its strategic location in Sheridan County, Wyoming, this system reflects the importance of efficient water management and the need for ongoing maintenance and monitoring to ensure its continued functionality and safety for all stakeholders involved.

Year Completed

1957

Dam Length

165

Dam Height

16

River Or Stream

PERALTO DITCH

Primary Dam Type

Earth

Surface Area

27

Hydraulic Height

12

Nid Storage

254

Structural Height

16

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

16
       
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.