This is the site of the bridge where the Tange Kempo Gym was located in Ashita no Joe, a story set in Sanya, which was a slum in Tokyo.
The bridge was located near the Kozukahara Penitentiary (near Minami Senju Station) on the Omoigawa River.
The sad name of the bridge which translates to “Bridge Of Tears” comes from the fact that criminals who were being taken to the Kozukahara Penitentiary said their farewells to their families and relatives on this bridge.
Now, all of the Omoigawa River has been culverted, and there are no remains of the bridge. However, there is a sign at the intersection to remember the sad history of this location.

Here is an interesting article that looks at the history of Namidabashi Bridge in depth.
Details
Name | Namidabashi 泪橋 |
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Address | Near Minami-Senju 2-chome, Arakawa-ku, Tokyo |
Access
5 minutes walk from Minami Senju Station on JR Joban Line, Tsukuba Express and Tokyo Metro Hibiya Line.