On the north side of the river, I-5 skirts the western edge of Burlington, passing car dealerships and retail stores, including the Cascade Mall and an outlet mall. To the west of downtown Burlington, the freeway intersects SR 20, a major state highway, in a partial cloverleaf interchange that includes several businesses inside the western loop. SR 20 continues west towards Anacortes and the Olympic Peninsula, and east through North Cascades National Park to the Okanogan Country as the North Cascades Highway. In northern Burlington, I-5 intersects the southern end of SR 11, which provides access to the western Chuckanut Mountains. I-5 crosses the railroad and the Samish River before reaching the Skagit Casino Resort and Skagit Speedway near Bow and Alger, located in the middle of the heavily forested Chuckanut foothills. The freeway then travels up into the Chuckanut Mountains and crosses into Whatcom County south of Lake Samish. The entire Skagit County section of I-5 is designated as the Skagit Valley Agricultural Scenic Corridor, a state scenic byway, in recognition of its agricultural industry.