Yosemite National Park announced it will start taking reservations Friday for Yosemite Valley campsites that had been held back because of potential flooding.

The sites in the Lower Pines and North Pines campgrounds have been released for arrivals during the month of June. Bookings for May will be added “as conditions permit,” the park said.

Both campgrounds are on the Merced River at the valley’s east end. The sites cost $26 to $36 a night; reservations can be made online at recreation.gov.

The park also announced the planned reopening Friday at 8 a.m. of Glacier Point Road. It warned that some trails in the area are still hazardous because of snow, flooding and fallen trees. In particular, Four-Mile Trail’s top section, between Glacier Point and Union Point, remains closed.

Wilderness permits are now available for overnight hikes May 3 and later out of Glacier Point Road trailheads.

Tioga Road remains closed as snow-plowing continues. Historically, the road has usually reopened in late May or June.

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This year, reservations are being required for Yosemite day visits starting May 21. Those for dates through the end of June became available last week. Each day starting May 14, a block of additional reservations will be released for seven-day advance purchase.

Visitors with camping or lodging reservations within the park or wilderness permits do not need a day visit reservation.