The "Emigrant Fire" - named after the lake's Emigrant Landing - was first reported around 2 p.m. It was initially estimated at only an acre, but spread quickly in hot conditions and dry brush.
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The burning wreckage of a big rig was spotted by AIR7 HD along the side of the 5 Freeway and Caltrans confirms it is believed the truck fire started the blaze.
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Firefighting crews were attacking the flames aggressively with 10 aircraft, dropping water from the lake as well as Phos-Chek.
By 4:30 p.m., firefighters said they had reached 5% containment.