No injuries have been reported, but mandatory evacuations have been ordered. Further north, dozer line along Middle Ridge is serving as a point for additional defensive firing operations in an effort to protect communities along the I-5 corridor, such as Castella and Dunsmuir.
Evacuation Shelter: An evacuation shelter has been established at Mount Shasta Community Center, 629 Alder Street, Mount Shasta.
I-5 remains closed between Fawndale and Mt. Shasta.
Some flames reached 300 feet in height, according to a U.S. Forest Service incident report. Motorists are advised to use an alternate route and avoid the area. There will be many drivers on the road, so motorists should expect delays.
A decision was expected Friday on when to reopen the highway.
Saturday's weather forecast for the Lakehead area calls for much calmer 2 to 6 miles per hour winds out of the north until late afternoon when they will be out of the south.
Officials must first determine if it's safe to resume travel on a 45-mile (72-kilometer) stretch of Interstate 5 near the OR state line. It's unclear when the lanes will reopen.
The fire prompted evacuation orders for scattered homes and buildings in three counties in and around the Shasta-Trinity National Forest.
Flames from a backfire burned around a fire truck battling the Delta Fire in the Shasta-Trinity National Forest, Calif., on Thursday.
The California Department of Forestry and Fire Protection has responded to 4,587 fires that have destroyed 613,710 acres (248,359 hectares), compared with 4,425 fires that destroyed 233,936 acres (94,671 hectares) through the same period in 2017, according to figures from the agency.
'Whatever occurred here was probably pretty ugly for a while'.
The fire erupted on Wednesday afternoon in a rural area and devoured timber and brush on both sides of Interstate 5 as it almost tripled in size overnight, officials said.
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A fast-growing wildfire has spread to 24,000 acres in Northern California and fire crews have not yet been able to get a handle on it, officials said Friday.
Authorities planned to keep I-5 closed throughout the night.
She says the blaze has destroyed thousands of trees that could fall onto the roadway.
Henwood, Fire and Emergency's Kerikeri-based Muriwhenua area manager, said the scale of the Carr and Hirz complex fires had been daunting, and the experience had been humbling.
"That is our main focus on this, is firefighter and public safety", Underhill said. It's now 15,294 acres after first being reported on September 5 at 12:51 p.m., with 0 percent containment. They later revised the affected streets to those along I-5 from Exit 707 to Exit 714.
He recommended making sure you have a full tank of gas, securing valuables and packing medications, important papers and heirlooms.
"They had a lot of ground troops- they just didn't have many people to manage them, so our people were in charge of crews", he said.
The blaze also has caused major travel disruptions in the region.
The blaze also delayed Amtrak's Coast Starlight service between Sacramento and Oregon.
Other businesses in the affected area carried on, though. Parked trucks lined more than two miles of Interstate 5 as both directions remained closed to traffic.
There's no estimated time for the freeway to open again.