OR officials confirmed two deaths in the Santiam Canyon region south of Portland, and a third in the Ashland area, near the California border.
His devastated family broke their silence to announce his death after several fraught days searching for the teen culminated in the discovery of his body.
Fears are mounting that the death toll will continue to rise as officials warned at least 16 people are now unaccounted for.
'He was supposed to leave when his brother did, but he didn't.
Another resident, Scott Boyd, told Space Weather: "I woke up this morning to a Mars-like orange sky that persisted throughout the day".
Josiah's mom Jessica Williams wrote on Facebook Wednesday that her son had not been seen since other family members escaped the blaze earlier in the week.
"The August Complex continues to spread aggressively, while the fire complexes further south have slowed their advancement".
So far, 10 people have been confirmed dead in northern California's Butte County. This is in response, she said, to reports that some essential consumer goods and services, especially lodging, saw outsized price increases. Authorities in Butte County said three people had died as thousands fled their homes.
'We had like 20 minutes after they sent out the alerts, ' she said.
Damaged homes and cars are seen in a mobile home park destroyed by fire on September 10, 2020 in Phoenix, Oregon.
"The President's action authorizes the Department of Homeland Security, Federal Emergency Management Agency (FEMA), to coordinate all disaster relief efforts which have the objective of alleviating the hardship and suffering caused by the emergency on the local population, and to provide appropriate assistance for required emergency measures.to save lives and to protect property and public health and safety, and to lessen or avert the threat of a catastrophe", a statement from the White House said.
Data from the Operational Land Imager (OLI) on the Landsat 8 satellite have shown the LNU Complex had burned 375,209 acres (586 square miles) by September 2, making it the third-largest wildfire by acreage in state history.
Now the 10th largest in the record books, the North Complex was about 50 per cent contained when winds thrashed it into explosive growth on Tuesday, driving it through rugged Sierra Nevada foothills and destroying much of the town of Berry Creek.
The North Complex fire was advancing more slowly Friday after the winds eased and smoke from the blaze shaded the area and lowered the temperature, allowing firefighters to make progress, authorities said. State officials said Thursday that 500,000 of Oregon's 4.2 million residents have been forced to evacuate, "and that number continues to grow".
Vince Ambrosia, a senior research scientist at California State University-Monterey Bay, working at NASA's Ames Research Center, said: "All these events were lightning-caused and burning in remote Mediterranean-ecosystem shrub and forested regions".
At least 10 people have been confirmed killed by the wildfires in California, with an additional five killed by fires in Washington state and Oregon.