Technically, Portage is no longer a roadside glacier, as it recedes an average of one foot a day and is now no longer visible from the road, but its big blue icebergs are often found along the shore of the lake, right in front of the parking area. On Byron, ice worms are common, if you get down and look. There are also beautiful ice caves and rivulets to see, but be careful not to walk too far onto the ice of this tempting glacier. You can see the lake in a half hour, but may want to spend time at the Begich Boggs Visitor Center (½-1 hour), hike to Byron Glacier (1 hour), take the boat cruise (1 hour), or have lunch at the local cafeteria.
Head south from Anchorage on the Seward Highway, to the end of the 5-mile Portage Spur Road. You can visit the face of Portage by tour boat from the dock at the lake. Byron Glacier trailhead is near Portage Lake. It's a one-mile scenic walk to the glacier face along Byron Creek. Bring a light jacket, as winds tend to pick up around the face of the glacier itself.
48 miles south of Anchorage