Bozeman Clean-Up day is Saturday 4/21, 8:30 - 12. The main staging point is Bogert Park. However, if you want to walk thru ditches with Big Mike, meet at the eastern terminus of Cascade Street.
Update: A big success - over 20 folks showed up from my neighborhood. They picked up lots of trash. And one volunteer found a dollar bill in the ditch east of Ferguson.