Southeast of Seattle in the Naches Ranger District, the Chinook Pass Area has miles of dirt biking trails located off SR410.
Here is a description of the Chinook Pass horse trails:
Lily Pond Trail (#617) is a more difficult 1 mile route.
Sweet Home Trail (#665) is a more difficult 1.7 mile route.
North Fork Wenas Trail (#670) is a more difficult 1.8 mile route.
Bald Mountain Trail (#675) is an easy 1.4 mile route.
Kaner Flat Trail (#676) is a most difficult 7.3 mile route.
Little Rattlesnake Trail (#680) is a more difficult 2.6 mile route.
Naches Pass Trail (#684) is an easy 6.3 mile route.
Milk Lake Trail (#686) is a more difficult 3.0 mile route.
Manastash Ridge Trail (#688) is a more difficult 6.6 mile route.
Summit Trail (#694) is a more difficult 5.4 mile route.
Mid-Summit Trail (#695) is a more difficult 2.0 mile route.
Mud Springs Trail (#696) is a more difficult 8.4 mile route.
Clover Springs (#697) is a more difficult 3.4 mile route.
CJRs Hideout Trail (#644) is an easy 1.5 mile route.
The Deep Creek Horse Camp, which is access by FS1808-395, has 6 campsites, 6 hitch rails, a watering trough and parking for 15 vehicles.
Overall, Chinook Pass Area is the 19th most popular dirt bike trail of all 38 dirt biking rides in Washington.