I took this from my seat in the car on our way home this evening from a trip to Portland, Or & yes you're right, that bridge goes on forever LOL
We are just coming down from the highest part, which is 200 ft above the Columbia River to allow the huge ocean going ships to pass beneath on their way to Portland, Or.
I got to walk across this bridge a few years back when I took part in the Great Columbia Crossing, which is held every October when one lane is closed to allow the hundreds of runners & walkers to cross from Washington State, which you can see in the distance here, to Oregon - the only time pedestrians are allowed on the bridge. I have to say it was an excellarating experience.
I include some links so you can see more of this amazing bridge that we cross on a regular basis as Astoria is our closest town.