Certainly Portland, OR has dining establishments along the waterfront where one can relish a delectable meal while enjoying captivating vistas of the Willamette River;

• Three Degrees, at Kimpton RiverPlace Hotel. This establishment offers a menu inspired by the Pacific Northwest. Presents a view of the river. It possesses an ambiance for dining during the summer months when one can savor their meal on the terrace.
• Aquariva. Situated on the banks of the Willamette River this eatery offers a menu that changes to incorporate locally sourced ingredients. The views from their patio are tranquil and picturesque making it an ideal location for a dinner or a special celebration.
• Il Terrazzo at the Portland Spirit. Although not your waterfront restaurant Il Terrazzo operates on the deck of the Portland Spirit cruise ship providing guests with an immobile dining experience that boasts panoramic water vistas. It's an option that also allows you to observe passing boats as you indulge in your meal.
• McCormick & Schmick’s Harborside, at the Marina. With its deck overlooking the marina this establishment grants diners a splendid view of the river. This place is famous, for its seafood and top quality steaks offering an American dining experience.
• Altitude Restaurant at The Porter Portland. Although its not situated directly by the waterfront this rooftop restaurant boasts a view of the city and river. It's a choice for those who love landscapes combined with scenic vistas.
• Meriwethers Restaurant. Even though its a bit away from the river Meriwethers is renowned for its garden and a menu that highlights local and seasonal ingredients. The outdoor dining experience here is truly delightful surrounded by greenery and featuring a water element that pays tribute, to Portlands river culture.

Please keep in mind that operational hours or menus of these establishments might change so its always recommended to check their status and make reservations before planning your visit.

Additional Resources;

Stay updated with the information and menus, at Three Degrees by visiting their website; Three Degrees.

Discover more about Aquariva by checking out their website; Aquariva.

To explore dining options on the Portland Spirit visit their website here; Portland Spirit.

Get acquainted with the offerings of McCormick & Schmick’s Harborside at the marina in Portland by visiting their website; McCormick & Schmick’s Harborside.

Experience a rooftop dining experience at Altitude Restaurant by learning more on The Porter Portland's website; Altitude Restaurant.

Get all the information you need about Meriwethers Restaurant online at their website; Meriwethers Restaurant.

Keep in mind that Portlands weather is known to be changeable and outdoor seating is most comfortable during the spring, through early fall months. Enjoy your dining experience while taking in some of Portlands waterfront views!