Coldwater Peak, Harry's Ridge & Pumice Plain


Day Hike - Harry's Ridge

Explore the blast zone from the 1980 eruption of Mt. St Helens, with spectacular views of the mountain enroute, a commanding view of Spirit Lake at the lunch spot, Harry's Ridge, and an opportunity to tour the Johnston Observatory after the hike.

  • Moderate
  • Moderate
  • Mileage: 8.2 mi
  • Elevation Gain: 970 ft

Meet at 10 AM at the entrance to the Johnston Observatory at the end of SR 504 in Mt. St. Helens National Volcanic Monument, reached by driving south on I-5, east at Exit 63 onto SR 505 and east on SR 504 at the T junction.

This hike is in the open the entire way, so be prepared to protect yourself from all weather possibilities, sun, rain, wind, heat and cold.  There is water available at the trailhead and the nearby Johnston Observatory, but nowhere on our hiking route.  Bring containers for at least two liters of water that you will carry on the hike.  No parking pass is required at the Johnston Observatory parking lot, but hike participants must show one National Park Pass  for every four people, or one Northwest Forest Pass per person at the entrance to the Johnston Observatory.  That will allow everyone in the hiking group to receive a wrist bracelet that must be worn throughout the hike.  The bracelets are checked by Rangers who patrol the trail. Restrooms are available at the Johnston Observatory and at the Coldwater Lake Picnic Area and the Coldwater Lake Boat Launch, which are on SR 504, a few miles before reaching the Johnston Observatory.



Coldwater Peak, Harry's Ridge & Pumice Plain

  • Green Trails Mount St Helens NVM No. 332S

    Green Trails Spirit Lake No. 332

    Green Trails Mt St Helens No. 364
  • See full route/place details.
Required Equipment

Required Equipment

The Ten Essentials

  1. Navigation
  2. Sun protection
  3. Insulation (extra clothing)
  4. Illumination
  5. First aid supplies
  6. Fire
  7. Repair kit and tools, including knife
  8. Nutrition (extra food)
  9. Hydration (extra water)
  10. Emergency shelter
Trip Reports