The third site is more ambiguous than the other two. It is roughly called the Washington Street Interlock and encompasses the area bound by South Water Street on the east, the Amtrak railway on the west, Florida Street on the north and Washington Street on the south. The site formerly was the location of a major crossroads of rail lines from the Milwaukee Road and the Chicago and Northwestern rail lines. The C&N entered from the south-east and exited the north-west in the 3rd Ward, and the Milwaukee Road entered from the south and exited to the north-east to downtown and the Menomonee Valley. The area between this triangular form was used as a yard, called the Florida Yards terminating at Florida Street. The area saw very heavy rail traffic for over 100 years as it was the primary route to Chicago. Today it has been broken up into a number of different uses. The railway corridor, formerly the Milwaukee Road is now operated by the Soo and carries Amtrak traffic to the Milwaukee Intermodal Station and freight to the Menomonee Valley. The former C&N line is abandoned. The north branch now is the parking lot for Summerfest and the Italian Community center and the rest of the line north was ripped up to become a bike trail running past the Art Museum north through the East Side. The south branch passes by the Solvay site and exits into Bay View.
The site is now used for light industrial by J Marchese Fruits and Usinger Sausage. Seemingly abandoned warehouses exist on the north end and marina buildings along the river. Of the three sites, the Washington Street Interlocking has the most existing buildings and infrastructure and is closest to existing industrial developments in the 5th Ward.
