MP: 104.43 Location: US-97 and SR 10, Kittitas Cty Rare “BEGIN” sign in Washington   MP: 104 Location: SR 10 and US-97, Kittitas Cty SR 10, being a small part of an old alignment of US-10, still carries the old milepost numbers. So back when this was part of the primary Idaho to Seattle route, … Continue reading State Route 10, US-97 to SR 970