Marshes Flat Road Flooded Near Moccasin Sponsored by: By B.J. Hansen Published Jan 11, 2017 08:27 am Marshes Flat Road Near Kelly Grade View Photos Moccasin, CA — The CHP reports that Marshes Flat Road is closed indefinitely due to flooding. The roadway was washed out near the area of Kelly Grade. It remains unclear how long it will be closed. We’ll pass along more information when it becomes available.