This is a short tunnel running under 9th st. which handles river overflow, but is rarely underwater except in severe flooding events. I was surprised to find it mainly because of the size, it is quite a large feature in the storm drain system of this particular city. Not much else to say as of yet, the pictures speak for themselves.
Nearby is a woods containing many illegally dumped tires. Everybody loves a tire, adopt one of these poor abandoned ones today!