How Yellowstone boardwalks are built
A feature explains how Yellowstone constructs and maintains its geothermal boardwalk network, covering design choices and ongoing upkeep. (unofficialnetworks.com) The piece walks through materials, safety considerations, and the park’s approach to protecting fragile features. (unofficialnetworks.com)
Yellowstone’s geothermal boardwalks are built to do two jobs at once: keep visitors off thin, scalding ground and keep fragile hot-spring formations from being crushed. (nps.gov 1) (nps.gov 2) The park says it has more than 15 miles of boardwalk across thermal areas, with crews that plan, build, and maintain the routes visitors use to reach geysers and hot springs. Yellowstone contains more than 10,000 thermal features, including the world’s greatest concentration of geysers. (nps.gov 1) (nps.gov 2) A thermal area is ground heated from below by hot water and steam, and in Yellowstone that crust can look solid while hiding near-boiling water underneath. Park rules tell visitors to stay on boardwalks and designated trails because severe and fatal burns have occurred in these areas. (nps.gov 1) (nps.gov 2) The routes cannot be treated like ordinary trail work because Yellowstone’s thermal basins move and change. The National Park Service says Norris Geyser Basin changes daily, and the basin’s water levels, seismic activity, and heat can alter where a safe path can go. (nps.gov) (nps.gov) That shifting ground can force the park to rebuild or move a boardwalk after it is already in place. The Yellowstone Volcano Observatory said a section of the Porcelain Basin Loop at Norris was removed after hotter ground below charred the wood footings, and the replacement alignment was shifted about 3 feet. (usgs.gov) Yellowstone’s own boardwalk video shows crews laying out routes, setting supports, and building paths that can be adjusted as thermal conditions change. The park says visitors often walk over the finished structure without noticing the maintenance work underneath. (nps.gov) (youtube.com) The network is also part of a larger access system in a park that covers more than 2.2 million acres and has about 1,000 miles of hiking trails. Yellowstone Forever, the park’s nonprofit partner, says boardwalks are the primary tool for protecting visitors from thermal hazards while still letting them see major geothermal sites. (yellowstone.org) Recent events have kept that safety role in view. Yellowstone says Biscuit Basin has remained closed since a hydrothermal explosion on July 23, 2024, because of the possibility of another event at the site near the parking lot, boardwalk, and Firehole River. (nps.gov) In Yellowstone, a boardwalk is less a fixed sidewalk than a movable barrier over living ground. The park keeps rebuilding them for the same reason it built them in the first place: the landscape does not stay still. (nps.gov) (usgs.gov)
