Authorities have reopened Interstate 5 at the California-Oregon border amid a wildfire that has spread to 8,000 acres and left one dead.

The blaze, dubbed the Klamathon fire, started early Thursday afternoon in Siskiyou County, California, according to the California Department of Forestry and Fire Protection. The interstate was closed later Thursday and reopened before 7 a.m. Friday.

California authorities have confirmed one person died in the blaze.

#Klamathon (UPDATE) CAL FIRE and the Siskiyou County Sheriff's Office has confirmed a civilian fatality. Identification of the deceased is pending further investigation and notification to the next of kin. pic.twitter.com/2i58JAqgX0 — CAL FIRE SKU (@CALFIRESKU) July 6, 2018

The Oregon Department of Transportation shortly before 9 a.m. that travelers should expect heavy and slow traffic in the area that had been closed because of the blaze.

The fire has threatened, damaged or destroyed multiple structures, the California agency said. It is 5 percent contained. The Associated Press reports California's governor has declared a state of emergency for Siskiyou County.

The Oregon transportation department said conditions could change throughout the day. Keep tabs on TripCheck.com for the latest traffic conditions.

While the Klamathon fire has not reached Oregon, Jackson County Search and Rescue officials are urging hikers and other outdoors enthusiasts to avoid forested areas near the Oregon-California border as a precaution.

The areas of concern include the Pacific Crest Trail, Mount Ashland, and the Cascade-Siskiyou National Monument. Officials are concerned that people may have difficulty receiving evacuation notices and getting out of the remote area quickly if it becomes warranted.

This report will be updated.

-- Jim Ryan