Eagle Island State Park is a state park of Idaho, USA, providing day-use recreational facilities near Boise. The park is 8 miles (13 km) west of the state capital on the outskirts of the city of Eagle. Facilities include a swimming beach, a picnic area, more than 5 miles (8.0 km) of equestrian trails, and a water slide. Eagle Island State Park is bordered on the north and south by two forks of the Boise River.