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Take I-90 east to Ellensburg.
Once past the second exit for Ellensburg take I-82 east towards Yakima/The Tri-Cities. (Prosser is about 52 miles east of Yakima.)
Take the first Prosser exit, #80, and turn right onto Wine Country Road.
Quickly merge left to turn left on Merlot Drive.
Continue past Prosser RV park to Vintner's Village.
Turn Right on Port Street and proceed past Thurston Wolfe Winery to The Winemaker's Loft.
Driving time is about three hours.