 DQ. Happy taste. 517 Diner in Three River Falls. The newest, most trendy diner in town. Come for the classic breakfast or lunch items. Find something on their drink menu too. Run through the drive-thru or sit back in the cozy lobby. At 517 Diner, you can choose from creamy milk tea, energizing coffee, hydrating hydrolyte, or fruity smoothie. Try flavors like Thai, coconut, mango, pineapple, honeydew, or papaya. Or crystal bubble lineup featuring lychee, taro, rainbow, brown sugar, and cherry blossom. Stop in today. 517 Diner. Located in