The Russian River reached a crest of 45.4 feet late Wednesday night, just short of the projected peak of 46 feet, according to officials.
The river has started to recede and is expected drop to below flood stage of 32 feet early Friday morning.
County officials are waiting for the river to recede below flood levels before they can begin to assess when they will allow evacuees to return home.
They are hoping to allow re-entry as early as Friday afternoon or Saturday.
It is estimated that 2,000 homes, businesses and other buildings in Sonoma County have been flooded from the rising Russian River.
The flooding has left two communities virtual islands after days of stormy weather.
The towns hardest hit are Guerneville and Monte Rio after the river topped 46 feet late last night.
The river frequently floods in rainy weather but it hadn’t reached that level for 25 years.
About 3,500 people in two dozen communities along the river remained under evacuation orders.
Major flooding continues this morning but the river is expected to slowly recede through the day.
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