SAN DIEGO -- A brush fire alongside state Route 52 shut down three westbound lanes Friday afternoon.
The fire began spreading on a hillside next to the northern side of the highway near Mast Boulevard for unknown reasons about 4:30 p.m., according to the San Diego Fire-Rescue Department.
The fire was initially reported as being half an acre but grew to 21 acres before the progress of the fire was stopped, according to SDFD.
"The terrain made it move very quickly," SDFD Battalion Chief Rob Hartman said. "Twenty-one acres is actually pretty good considering what the potential is."
SDFD initially reported the fire having the potential to spread to up to 100 acres.
Officials have utilized brush and standard engines, air support and water tankers in attempt to put the fire out.
Both Heartland Fire and Cal Fire are assisting the SDFD. Crews utilized brush and standard engines, air support and water tanks in an attempt to put the fire out. Close to 100 personal helped stop the fire, according to Hartman.
By 10 p.m., the fire was 90 percent contained and was expected to be fully contained by noon Saturday.
All westbound lanes had reopened by 10:20 p.m.