Twin River Bank (Clarkston) Share: Banking Twin River Bank (Clarkston) Visit Website 900 5th St. Clarkston, WA 99403 (509) 758-4848 (509) 758-4949 (fax) Hours: Lobby- Monday-Friday 9:00am-5:00pmDrive-up- Monday-Friday 8:30am-5:30pmATM, Night Drop,online bank About About Local Bank, Local Decisions. Investing in the LC Valley Since 1979. Give us a chance. We compete hard and have great loan and deposit products!