Mount St. Helens/Worm Flows
A scramble of 12 miles with 5,700 feet of gain and the preferred winter route.
GETTING THERE
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.
Notes
- 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 schedule a trip at a time during the off "winter" season. 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.
- Suitable Activities: Backcountry Skiing, Scrambling, Snowshoeing
- Snowshoeing Category: Intermediate
- Seasons: January, February, March, April, May, December
- Weather: View weather forecast. View avalanche forecast.
- Difficulty: Strenuous 5, Technical 4, Winter Scramble
- Length: 12.0 mi
- Elevation Gain: 5,700 ft
- 8,363 ft
- Land Manager: Mount Saint Helens National Volcanic Monument
- Parking Permit Required:
- Recommended Party Size: 12
- Maximum Party Size: 14
- USGS Mt St Helens
- Green Trails Mount St Helens NVM No. 332S
- Green Trails Mt St Helens NW No. 364S
Upcoming Activities
Seattle Basic SIG SNOW FT - SIG Snow Overnight (Snow Anchors & Belays, Crevasse Rescue, Snow Camping, & Roped Travel) - Mount St. Helens/Worm Flows
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- Chocolate Falls
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