The free Bradford Island Visitor Center at the Bonneville Lock and Dam offers great views of the Gorge and the chance to get face-to-face to the fish that call the Columbia River home, whether it’s an ancient six-foot-long sturgeon that lives on site or agile rainbow trout making their way up the fish ladder. The best fish viewing times are from April through October, along with September for the salmon run. There’s also an online fish camera. At the visitor center, families can also learn about the hydropower generated by the Bonneville Dam, built in the late 1930s. At the nearby hatchery, kids can see and feed young trout.