Chester No. 4 is a privately-owned dam located in Sanpete, Utah, with a primary purpose of irrigation. Constructed in 1883, this Earth-type dam has a structural height of 10 feet and a storage capacity of 89 acre-feet. It is regulated by the Utah Division of Water Rights, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.

The dam is situated on Canal and Oak Creeks, draining into the San River, and falls under the jurisdiction of the Omaha District. With a low hazard potential and a condition assessment that is currently not rated, Chester No. 4 poses minimal risk. The last inspection took place in May 2017, with a scheduled inspection frequency of 5 years. While there is no Emergency Action Plan (EAP) in place at present, the dam meets guidelines and is equipped with emergency contacts for any unforeseen events.

Water resource and climate enthusiasts will appreciate Chester No. 4 for its historical significance and role in supporting agricultural activities in the region. As a crucial part of the local irrigation infrastructure, this dam serves as a reminder of the importance of water management and the need for ongoing monitoring and maintenance to ensure the safety of both the structure and the surrounding community.