My local MUP has a couple spots where stuff (mostly clay or gravel) have washed across the trail. I am tired of waiting for the city to come clean the trail so I decided if I want it cleaned I should do it myself. I built this shovel rack out of a 1x6, some screws, a U-bolt, and some conduit hangers. I need to replace the "stock" nuts on the U-bolt with wing nuts for ease of removing and resecuring the shovel but otherwise I think this setup should work out okay. Even my dog thinks this is a ridiculously great idea.
I'll try to get some "action shots" and before/after on the trail cleanup.

Rack on the bike

Attached to the existing rack with conduit straps. I used some cut sections of tubing to increase the diameter of the rack bars. It's not perfect but it's what I had laying around and I don't intend to leave the rack on the bike as a perminate fixture anyway. I need to get some wing nuts to fasten the U-bolt.

This was the simplest solution I could come up with for securing the shovel 'blade'. Screwed and glued for the strongest hold.
I hope you like it.