Chinook Pass

The pass is located on the crest of the Cascade Range, along a ridge between Yakima Peak to the northwest of the pass, and Naches Peak to the southeast. The boundary between Pierce County, west of the pass, and Yakima County to the east, coincides with the ridge. Terrain immediately west of the pass is in the Cowlitz River watershed. Terrain on the east side drains to the Yakima River watershed.

The pass provides the east entrance to Mount Rainier National Park, and carries State Route 410 between the towns of Enumclaw and Naches. Because of the high elevation, Chinook Pass is usually closed in November due to very heavy snow and significant avalanche danger. It usually opens in mid-May and is not uncommon to have a snow depth at the summit of up to 15 feet.

Wikipedia