Motor Boat Mail

This is a Motor Boat mail cover that I have where it depicts the Star route from Agness to Gold Beach, Oregon. 

Agness is served by one of only two rural mail boat routes still operating in the U.S. (The other is on the Snake River in Idaho). The mailboat runs on the Rogue River between Gold Beach and Agness during the summer months. The mail is delivered by road for the remainder of the year.