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