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The exposure grade describes the potential consequences of falling or slipping off the path.
Low Exposure: The path is on completely flat land and potential injury is limited to falling over.
Medium Exposure: The trail contains some obstacles such as outcroppings and rock which could cause injury.
High Exposure: Some trail sections have exposed ledges or steep ascents/descents where falling could cause serious injury.
Extreme Exposure: Some trail sections are extremely exposed where falling will almost certainly result in serious injury or death.
Built back in 1915 and taking in 22,000 feet (6,700 metres) of elevation gain, this is a tough and historic journey that most hikers complete in 2 weeks-ish.
Once underway the trail is rarely flat as it climbs and descends the various flanks of Rainier (including Panhandle Gap, which at 2600 metres is the highest altitude the trail reaches) but the constant effort is rewarded by a continual change of scenery, from deep forested valleys to sub-alpine meadows.
There are 18 campsites on the trail, roughly 3 to 7 miles (5 to 11 kilometres) apart and these are unfailingly stunning.
Every camp has cleared tent sites, a pit or composting toilet, bear pole for hanging food, and a nearby water source.
A backcountry permit, including reservations for designated camping areas, is required to hike the Wonderland Trail and these can be obtained here - https://www.nps.gov/mora/planyourvisit/wilderness-permit.htm.