Lower deck of Western Hills Viaduct closed for inspection Saturday Scott Wegener | WCPO The Western Hills Viaduct, here photographed in winter 2019, was built in the 1930s and is ranked in "poor" condition by federal authorities, rated "structurally sound" but "functionally obsolete." and last updated 2021-05-20 17:12:26-04 The lower deck of the Western Hills Viaduct â including the ramp from I-75 â will be closed Saturday, May 22, from 7 a.m. until 3 p.m. for a scheduled inspection. Crews will conduct visual inspections, which are part of the cityâs routine maintenance of the structure. Local drivers will be detoured to Spring Grove Avenue.