On the freeway this morning the passanger side rear wheel clunked like I
hit a rock.  It happened 2 more times.  Got off freeway to examine tire.
Pressure around 45 tire, looks normal, grab and shake-no give.  The belts
look o.k.    Drive the backroad the rest of the way to work for lower
speeds and i happened again 2wice.   What could be going on?

Thanks,

--
Arlene Sondergaard
CVO Sediment Lab
1300 SE Cardinal Court, Suite 100
Vancouver, WA  98683
360-993-8943
asonder@usgs.gov