They did somehow. There's pictures all over of people standing on level snow touching street lights. You know, the red/yellow/green ones that hang over intersections.
Check this out. Most of these pictures show 15-18 feet of snow. Drifts of up to 30 feet were not uncommon. What happened was Lake Erie froze over very early, and by the end of January a steady 60 inches of snow had fallen. A good 3 feet was already on the lake, so when gusts of up to 70mph winds came, it blew all the snow off the lake into the surrounding area. There was so much snow, that dump trucks were actually taking it back to the lake, driving out onto the ice and dumping it back. It got to the point that the national guard was already up here cleaning up before the real blizzard even hit. Visibility driving conditions went from .75 miles to 0 miles for over 25 hours and a total driving ban was in place for over a week. Plows had to go back because they couldn't see their own plow blades and the plows were unable to push the snow because it was so compressed it was almost like cement so Earth front loaders were called in.
http://lmgtfy.com/?q=blizzard+of+77