Hi Grady, yes, that strip of grass between the sidewalk and street is what we call the boulevard, the curb strip, the parking strip etc. They are public property and it is ok to detect them. Some homeowners think that is their property but it is not, I've had the Missoula Police drive by and never a problem for detecting there. To help make things go OK with the nearby homeowner, I always go up and knock on the door to make sure they are cool with me detecting out there. I also use that opportunity to ask permission to detect their front yard. I would think detecting where folks go floating on the Big Blackfoot and Clark Fork River might get you some silver or gold rings and some old coins.