Are sites in the Gorge accessible to people with limited mobility?

You will find that there are TONS of accessible sights along the Historic Columbia Gorge Highway, including Multnomah Falls. There is an elevator in the historic lodge there and a wheelchair ramp to the main viewing area. The trail is paved all the way to the bridge, but it might be a little steep for someone with limited mobility.

Other waterfalls easily accessible are Latourell, Wahkeena, and Horsetail Falls. All of those areas are paved, and easily seen within a short distance from the road.

Also, make sure to stop at Vista House at Crown Point. There is a wheelchair ramp into the building, and an elevator inside to access the lower floor.