Dose anyone know of any very old rivers, lakes, ponds around Lewiston idaho/Clarkston washington?

So you bought a metal detector and don't know where to search. Go to a park where they have swings. Search beside the sidewalk going to the parking lot and under the swings and jungle gyms. You will find coins there. In town, go to the old buildings that used to be bars or hotels and search around the back doors.

Idaho and Washington are not known for battle sites. If you find a creek, you might find a lot of 22 caliber bullets, shells on one side and slugs on the other.