Every few months, the people behind Mr. Trash Wheel do a lively AMA on Reddit, the last of which was in August: https://www.reddit.com/r/IAmA/comments/4fzb1w/i_am_mr_trash_...

Definitely a fun way to get people who might otherwise care less interested in reducing the waste that ends up on urban bodies of water.

One in December with the newer Professor Trash Wheel: https://www.reddit.com/r/IAmA/comments/5gnek7/we_are_mr_tras...

Here's a short video:

https://www.youtube.com/watch?v=RkQbcrzyAeE

It's powered by the water current or if need be by solar cells.

and they'll soon need one on the anacostia

And there is interest in having one on the Anacostia River: http://dcist.com/2017/03/what_exactly_is_a_trash_wheel_and_d...

The SF Bay has the Raccoon, a trash collection boat operated by the U.S. Army Corps of Engineers, out of Sausalito. It's for bigger stuff, like logs, that could hole small craft if hit.

Heeyy I live there! Now we have Prof. Trash Wheel as well. Honestly, I'm pretty bullish on Baltimore; much more affordable than Manhattan or San Fran.

This doesn't seem like a lot of trash collected for 3 years time.