MNN Galleries

13 amazing sinkholes

The Great Ravenna Boulevard Sinkhole

Photo: Seattle Municipal Archives

7 of 15

The Great Ravenna Boulevard Sinkhole

One of the largest and most expensive sewer collapses in the United States occurred on the night of Nov. 11, 1957, in Seattle. The sewer trunk collapsed 145 feet below the street, but the massive sinkhole that resulted was just 60 feet deep. Repairs took two years to complete.