The active stratovolcano of Mount St. Helens is located only 19 miles (30 km) to the north-northeast, easily visible from the summit of Tumtum Mountain on clear days. The historic Yale Bridge, a one-lane metal suspension bridge built in 1932 over the steep canyon of the Lewis River at the eastern end of Lake Merwin, is located about 2.5 miles (4 km) to the northwest on SR 503. Yale Dam, a high hydroelectric dam built in 1953, is located about 2 miles (3 km) to the north of the mountain.