Northwest of Spokane, the 10,000 acre Riverside State Park has 55 miles of mountain mountain biking trails. There are more than 37 miles of riding on the Centennial Trail.
To reach Riverside from Spokane on US90, use Exit 280. Cross the Maple Street bridge and then turn left at Maxwell. Follow Maxwell (it turns into Pettit) past the Downriver Golf Course to the park entrance.
Overall, Centennial Trail is the 51st most popular mountain bike trail of all 59 mountain biking rides in Washington.