Yellowstone National Park will partially reopen at 8 am on Wednesday after catastrophic flooding destroyed bridges and roads and expelled thousands of tourists.

The Park Service announced Saturday that visitors will again be allowed on the park’s southern circuit under a temporary sign system designed to manage crowds: those with even-numbered plates and motorcycle groups will be allowed on even-numbered days, and those with number plates. odd or vanity on odd days.

Commercial tours and visitors with proof of overnight reservations in hotels, campsites or in the hinterland will be allowed on any sign.

Visitors were flocking to Yellowstone during the 150th anniversary celebration. The south turn gives access to Old Faithful, the colorful Grand Prismatic Spring and the Grand Canyon of Yellowstone and its majestic waterfall. It can be accessed through the south, east and west entrances to the park.

“It’s impossible to reopen just one circuit in the summer without implementing some sort of system to manage visitation,” Yellowstone Superintendent Cam Sholly said in a press release. “My thanks to our gateway partners and others for helping us find an acceptable temporary solution for the south loop as we continue our efforts to reopen the north loop.”

The northern circuit is expected to remain closed through the summer, if not longer. Officials say it could take years and cost more than $1 billion to repair damage to the environmentally sensitive landscape.