North Cascade Smokejumper Base is 4 mi. s.e. on Castle Ave. and Twisp-Winthrop Eastside Rd., then w. to 23 Intercity Airport Rd. Visitors can take 30- to 60-minute guided tours of the facility for airborne firefighters, including the parachute loft and aircraft. Jumps can be watched during training sessions, usually held in early June.