I've been wanting to check out this drain for a while, and finally I did. There's some recent construction activity, so the entrance may soon be gated.
This is a straight shot 1/4 mile from the river side outfall to a little pond in a golf course. Shallow, clean running water, fresh breeze, no hidden pits, and no used needles.
The drain passes underneath a tram yard with several generations of old trains kicking around in it -- Not pictured but clearly visible up the hill over the outfall. This is of course what makes the drain interesting
Unfortunately, the manholes and grates are all rusted shut, and all the top rungs are partially or totally rusted out. It's scary to climb them, and impossible to exert any real force on the manholes without breaking the rungs. I'm interested in how people deal with these...
There's also plenty of other interesting stuff to check out in the area, and some very nice "smoke spots" with excellent views of surrounding highways -- Not pictured because they explicitly show the location.
A word of caution: The park abutting this area is a popular "cruising" spot, meaning a place where (old, unattractive) men go to find anonymous sex. If you are spotted slinking off into the bushes, expect to be followed!
In the surrounding area, there's tons of very old sewers and drains. Some of them are partially collapsed.
The entrance is unmistakable and very easy to find.
Manhole 1
Grate 1
Manhole 2
Covered something
And here's the end of the tunnel, where fresh water drains from a pond into the tunnel