Two lanes were reopened Saturday night.
The fire burned close to a state historical landmark, a golf course and a shooting range.
No homes were threatened, but residents said they are still concerned.
"It concerns me all the time especially because we do not have any water in this facility except just for our house water. We don't have any water now for our grass or anything," said Karen Buma of the Yorba Slaughter Adobe.
Crews are still on the scene monitoring hotspots, but fire officials said the blaze is under control.
The cause of the fire remains under investigation.
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