Tri-Valley Family Restaurant Serving patrons for over a quarter of a century, Tri-Valley Family Restaurant in Dumont, New Jersey features a rich menu that includes Greek, American, Italian, and other foods as well as a strong breakfast menu and tantalizing desserts. Customers love Tri-Valley for the traditional diner-like atmosphere coupled with the professional and attentive service of its staff. But what they probably love most is the quality of the food and their affordable prices. Many customers find the prices so affordable that they end up coming on a regular basis.