The county Office of Emergency Services said it is monitoring the Arroyo Grande Creek Levee in case the creek keeps rising.
The rise in creek levels slowed significantly by Sunday afternoon, but with rain continuing through the week, people living in nearby low-lying areas should remain on standby.
Those areas include all areas west of South Halcyon Road and south of Ocean Street or the Union Pacific Railroad, within a half of a mile of Arroyo Grande Creek in the Oceano area.
At the request of the Five Cities Fire Authority, volunteers with the American Red Cross set up a shelter at Arroyo Grande High School so anyone evacuated or otherwise displaced by the storm had somewhere to stay.
As of early evening, volunteers were providing food and shelter for 20 people, according to the Red Cross.