In July 1962, the retaining walls on the Scioto River banks in downtown Columbus got a good cleaning.
The Columbus Dispatch reported it was the first face-washing and waterproofing in years.
The photo shows the clean, white appearance of the sloping structures north of Gay Street and the darker areas that were still to be treated.
Workers used pressure washers to clean the algae before waterproofing material was painted on the concrete as part of river-channel improvements.
The Ohio Penitentiary in the background, which stood on Spring Street, closed in 1984 and was razed in the late 1990s. It is now the southwest portion of the Arena District.
The U.S. Federal Courthouse is seen at right.