Travel Washington / Grape Line offers 1 Prosser boarding location for your travel convenience:

WSDOT Prosser Safety Rest Area – 141 Merlot Dr., Prosser
General Info: Advance, paid reservations for pick-up at the Touchet boarding location are required.
Directions: Take Exit 80 off I-82 southbound on N. Gap Rd. Take a left onto Merlot Drive and another left into the WSDOT Prosser Safety Rest Area.
Boarding Location: South side of the rest area building, near McDonald’s & Sinclair Gas Station.