Cross Cut Diversion Reservoir Report

Last Updated: December 5, 2025

The Cross Cut Diversion, also known as Chester Dam, is a private water structure located in St.


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Summary

Anthony, Idaho. Completed in 1938, this concrete dam serves primarily for irrigation purposes along the Henrys Fork and Snake River. With a height of 17.5 feet and a storage capacity of 250 acre-feet, the dam helps manage water resources in the region and supports agricultural activities in the area.

Owned and regulated by private entities in Idaho, the Cross Cut Diversion is classified as a low hazard structure with a satisfactory condition assessment. The dam features an uncontrolled spillway with a width of 355 feet and a drainage area of 1752 square miles. While the risk assessment for the dam is moderate, regular inspections and enforcement ensure its safe operation and minimal environmental impact. Water resource and climate enthusiasts will find the Cross Cut Diversion an essential component of the region's water management infrastructure, contributing to sustainable agriculture and environmental stewardship along the Snake River.

Year Completed

1938

Dam Length

457

Dam Height

17.5

River Or Stream

HENRYS FORK SNAKE RIVER

Surface Area

35

Hydraulic Height

17.5

Drainage Area

1752

Nid Storage

250

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

18
       
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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.