The Dungeness River is a 28-mile long river located in the Olympic Peninsula in the U.S. state of Washington. It rises near Mount Constance in the Olympic Mountains within the Olympic National Park, flows through the Buckhorn Wilderness, passes by the town of Sequim, and empties into the Strait of Juan de Fuca at Dungeness Bay, behind the Dungenes…The Dungeness River is a 28-mile long river located in the Olympic Peninsula in the U.S. state of Washington. It rises near Mount Constance in the Olympic Mountains within the Olympic National Park, flows through the Buckhorn Wilderness, passes by the town of Sequim, and empties into the Strait of Juan de Fuca at Dungeness Bay, behind the Dungeness Spit. One of its main tributaries is the Gray Wolf River. It is crossed by the Dungeness River Bridge.