Pacific Power and Oregon Department of Transportation crews will start an emergency rolling slowdown at 9 a.m. today on I-5 between mileposts 21 and 27 while a downed power line at milepost 25 is reinstalled.

Pacific Power and Oregon Department of Transportation crews will start an emergency rolling slowdown at 9 a.m. today on I-5 between mileposts 21 and 27 while a downed power line at milepost 25 is reinstalled.

During that time, traffic both ways will gradually slow down to 10 or 15 mph and later resume normal speed limits.

"So traffic doesn't stop per se," said ODOT official Gary Leaming.

The estimated time of slowdown is between 15 and 20 minutes, ODOT officials said.

The southbound I-5 on ramp at exit 27 will be closed during that time, as will the northbound on ramp at exit 24. Motorists are encouraged to seek alternate routes.

Pacific Power officials said all power should be fully restored by 4 p.m.

Pacific Power reported 1,512 customers in the Medford area were without power this morning after a "tree interference," according to a news release on their website.

The interference happened at 12:30 a.m. today when a tree fell onto a power line at milepost 25 along Interstate 5.

Five customers in the 97501 area code left without power now, officials reported at 8:14 a.m. As of 6:45 a.m., several traffic lights along Highway 99 were not working, and cars were treating those intersections as four-way stops.

Moderate winds are expected to continue today, the National Weather Service said, reaching speeds up to 17 mph with 26 mph gusts.

—Ryan Pfeil