Cal Fire officials said they believe the fire was sparked by carbon particles from a passing vehicle's exhaust.
As the fire approached homes, a mandatory evacuation order was issued for residents on View Side Lane in Alpine while an evacuation warning was sent to Flinn Springs residents near Flinn Springs Road and Old Highway 80.
Crews were able to stop the fire's forward rate of spread just before 5 p.m., and as of 6 a.m. Wednesday, Cal Fire said the blaze has charred 400 acres and is 60 percent contained.
Officials confirmed three firefighters were injured while fighting the blaze -- two with moderate injuries and one with minor injuries.
All evacuation orders have been lifted and all affected roads have been reopened. However, one eastbound I-8 lane between Lake Jennings and Dunbar remains closed.