Utica Auxiliary No. 4 is a privately owned dam located in Alpine County, California, near Dorrington. Completed in 1903, this rockfill dam stands at a height of 10 feet and serves multiple purposes, including hydroelectric power generation, recreation, and water supply. With a storage capacity of 2,500 acre-feet and a maximum discharge of 8,900 cubic feet per second, this dam plays a crucial role in managing the water resources of the North Fork Stanislaus River.

Managed by the Federal Energy Regulatory Commission, Utica Auxiliary No. 4 has a low hazard potential and a moderate risk assessment rating. While its condition assessment is not available, the dam undergoes regular inspection, with the last one conducted in September 2018. With an uncontrolled spillway and a spillway width matching its length of 279 feet, the dam ensures the safe release of excess water during high flow events. Despite its age, Utica Auxiliary No. 4 continues to be a key component of the region's water infrastructure, demonstrating its resilience and importance in water resource management.