From their website-
“RiverHOURS are issued in three denominations – 1 HOUR (equal to $10 federal), 1/2 HOUR (equal to $5 federal) and 1/10 HOUR (equal to $1.00). The currency is regulated by the Gorge Local Currency Cooperative (GLCC), an organization dedicated to increasing local trade”
“How to participate:
Anyone can participate! You don’t have to be a member of the GLCC to accept or spend RiverHOURS. If someone comes into your store and asks if you accept RiverHOURS, you are welcome to accept them or not. You do not have to be a member or even advertise in the barter and trade paper. As RiverHOURS becomes more and more popular, there will be more and more customers asking if you accept them. Please, take them! Then use your RiverHOURS to purchase services you need.”
And, all the vendors at the Gorge Grown Farmers Market accept RiverHOURS.