The rising Merced River today may force some Yosemite Valley campers to higher ground, the National Park Service says.

As June temperatures climb, the near-record snowpack is melting faster, which may cause flooding in Yosemite National Park for several days, according to the federal River Forecast Center.

The problem is not expected to damage buildings, but flooding might force officials to re-route traffic on Southside Drive.

Park officials say they are telling more than 1,600 campers near the river about the risk.

"We don't know how many people might be affected," said park spokesman Scott Gediman. "We will move people to safer sites, depending on where the water goes."

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