Hyrum State Park is a state park and reservoir in Cache County, Utah, United States. Hyrum State Park is in the northeastern part of Utah. It lies at 4,700 feet (1,400 m), and consists of 265 acres (1.07 km2) surrounding a 450-acre (1.8 km2) reservoir. The park is used for fishing, boating, camping, picnicking, hiking, waterskiing, and swimming. The park was named for Hyrum Smith, the brother of LDS church founder Joseph Smith. Fish in the reservoir include yellow perch, channel catfish, rainbow trout, largemouth bass, and bluegill.