Yellowstone’s Black Sand Basin closed for boardwalk repairs

Visitors to Yellowstone National Park walk along a boardwalk near Cliff Geyser in Black Sand Basin. (©Janet White-click to enlarge)

Visitors to Yellowstone National Park walk along a boardwalk near Cliff Geyser in Black Sand Basin. (©Janet White-click to enlarge)

From Staff Reports

Access to Yellowstone National Park’s Black Sand Basin will be temporarily closed until at least the Memorial Day weekend while maintenance crews replace and reroute a section of boardwalk that has been damaged by the area’s thermal features.

The closure will include the entire boardwalk around the basin as well as the associated public parking area, according to a statement released by the park’s public affairs office. Trails leading into the basin will also be signed and marked to protect visitors.

Park officials advise that it is unsafe and illegal to enter a closed thermal area in the park.

Black Sand Basin, a popular geothermal area located in the park’s Upper Geyser Basin near Old Faithful, has more than 300 feet of boardwalk that guides visitors through attractions such as Sunset Lake and Rainbow Pool.  However, as the basin’s thermal features constantly change, so too must the boardwalks that are placed over hot surfaces.

Park geologists use thermal mapping technologies to monitor the best areas to place boardwalks to allow for safe viewing of thermal features.

“We use cutting-edge technology and work collaboratively with park maintenance crews, landscape architects and law enforcement to protect not only our visitors, but also Yellowstone’s wonderfully dynamic geothermal processes that move and change daily right before our eyes,” said Yellowstone chief geologist Henry Heasler.

“So rather than build a permanent boardwalk around a spring or geyser, we continually move it, shape it, replace and re-route it, so that the springs can move where they wish and visitors can still follow them along,” he said.

Approximately 120 feet of Black Sand Basin boardwalk that has been damaged by extremely hot, acidic thermal waters will be rebuilt and rerouted using a combination of treated Douglas Fir wood decking and treated composite framing materials. An additional 200 feet of deck planking on the remaining boardwalk throughout the basin will also be replaced in stages, with half being completed during this project and the remaining half completed the following summer.

Wooden boardwalks in Yellowstone can last up to 30 years, depending upon conditions such as weather exposure, thermal features and wear and tear by the hundreds of thousands of visitor feet that cross over them every day. Ramps and other required accessibility features are also incorporated into outdated boardwalks when repairs are due. Black Sand Basin’s boardwalk is nearly 22 years old, making it a prime candidate for repair.

Park officials will announce in late may when the basin will reopen.

Contact Yellowstone Gate at 307-213-9818 or [email protected]

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