Of course, being a racoon, Walter wasn't the nicest house guest - but his behavior showed rescuers he was none the worse for wear.
"He did what raccoons normally do in housing overnight," Diehl said. "He ate every scrap of his food and flipped his water bottle over and shredded up his newspaper for bedding and tipped things over and made a royal mess of things. But that's typical for racoons."
Taking Walter's feistiness as a good sign, his rescuers gave him what he wanted and released him last night into the wild. Hopefully next time he ventures into the sewer, he'll find an easier means of egress.
Here's a video of Walter trapped in the grate - it's guaranteed to tug at your heartstrings. If you'd like to support rescues like this one, you can make a donation to the Wildlife Rehabilitation Center here.