Sullivan Mountain is a high mountain peak at an elevation of 1.977m (6,486ft) above the sea level, located in Pend Oreille County, in the northeast corner of the U.S. state of Washington, along the Canada–US border. It’s one of the highest mountain roads of Washington.
The road to the summit, located within the Colville National Forest, is gravel, rocky, tippy and bumpy at times. It’s called NF-245. The road is usually impassable from October to June (weather permitting). Great trail for experienced wheelers. At the summit is a fire lookout tower built during 1959. Avoid driving in this area if unpaved mountain roads aren't your strong point. Stay away if you're scared of heights. Expect a trail pretty steep (gains more than 3000 feet). Wet conditions may make for tough driving along the muddy road. Road is in rough condition. HIGHLY recommended a 4WD vehicle with good ground clearance.