I've heard that the Panorama needs to go to Portland for repairs on one of her azipods. In Portland there is a large submersible drydock. But the ship is too tall to go under the fixed bridges on the mighty Columbia River.
She could dock at Astoria, Oregon where her stacks could be disassembled, which would allow her to fit under the bridges and continue on to Portland.
If it isn't possible to do that in Astoria she might have to travel to Canada to have the stacks removed and then back down to Portland.