The fire on the west side (or San Francisco side) of the island has been contained.
The fire started shortly after 2 p.m. Fire crews have had some difficulty accessing the area since there are no easy paths to the location of the fire.
Alameda and San Francisco fire boats fought the fire from below, while tankers and engines worked from above and other crews tackled the steep hillside.
CDF was called for air support, but cancelled when San Francisco crews got the upper hand. In all, only two acres burned.
The San Francisco Fire Department says motorists were very good about keeping out of the way for engines when they first responded.
"The hydrants are spread out, some are not completely operable, but we have a lot of hose lines and did a lot of progrssive lays, and that's what leads to the success of a wildland fight," said a SFFD official.
No structures were threatened during the fire. The cause is still under investigation.
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