Mount St. Helens/Worm Flows

A scramble of 12 miles with 5,700 feet of gain and the preferred winter route.


Take I-5 S and get off at exit 22 to merge onto Dike Access Rd.  Merge onto Dike Access Rd, then continue onto Old Pacific Highway. Take a slight left onto E Scott Ave, and at the traffic circle take the 2nd left onto Lewis River Rd. After about 30 miles, Lewis River Rd continues as Rd 90.  Take a left at NF-83, and after about 6 miles the Marble Mountain Sno-Park will be on the right.


  • Climbing permits are required and done by lottery with the land manager.
  • A Sno-Park parking permit may be needed during month of April for the Marble Mountain Sno-Park.

information FOR LEADERS

scheduling & permits

Only one Mountaineers group may schedule a trip at a time during the off-season (late fall, winter, and early spring). Please check trip listings below to ensure you are the only group there on a given day. Multiple Mountaineers groups may schedule trips during the permitting season if each group has obtained a climbing permit.

  • Difficulty: Strenuous 5, Technical 4, Winter Scramble
  • Length: 12.0 mi
  • Elevation Gain: 5,700 ft
  • 8,363 ft
  • USGS Mt St Helens
  • Green Trails Mount St Helens NVM No. 332S
  • Green Trails Mt St Helens NW No. 364S

Upcoming Activities

There are no activities scheduled at this location.

Trip Reports

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  • Chocolate Falls

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