The bridge from P Roma to the train station - how long is that and is it all stairs or is there a flat walkway as well?
Lois, if you share your goals you can get better answers. Is this so you can get to the hotel you were asking about earlier? Otherwise I'm confused why anybody would need to cross there. Anyway, it doesn't matter. I've never measured it but would guess maybe 30 or 40 metres, ramped. If you have vaporetto passes you don't need to use the bridge at all (I've only ever gone under it). You can get a number 1 vaporetto from P Roma which will cross the Grand Canal and the first stop is Ferrovia - the train station - on the other side.
As I stated in my first message, there will be 5 (elderly) ladies on this trip only one of which (me) has ever been to Venice - a tour)
My goal is to find the easiest way/method to get to Hotel Universo & Nord @ Cannaregio, Lista si Spagna 121 from some parking facilities which I believe are either the Tronchetto or P Roma and it appears on the map that this bridge needs to be crossed. Which is the less of two evils? Schlepping our luggage on a water taxi or across the bridge? Or do you know of a carpark closer to the hotel, which is very near the Santa Lucia train station.
I didn't suggest a water taxi - I never would. I said vaporetto (water bus). If they don't want to walk and don't want to climb up a bridge, even if it is made of glass and has a ramp, then if you have vaporetto passes one more ride will cost no more money and may be more convenient. Tronchetto has a vaporetto stop too, but not for the number 1. If you are on the water, even dealing with luggage, your adventure has begun.
I crossed this bridge last September with a rolling suitcase. It isn't actually flat - it has very long steps, but they are still steps so you have to roll your suitcase over 'bumps' on the way up and down. Most annoying as it is a new bridge. I don't know why they didn't make it a smooth ramp like surface. I haven't read your earlier post, so I don't know where your hotel is located. It was pretty hot in September when I was there and I got quite hot and tired walking from Piazzale Roma to my hotel. Take it at whatever pace is comfortable for everyone. As for a water taxi, they are quite expensive and can be tricky to get into, but the driver will lend a helping hand in and out. I don't know if taking a water taxi will help - it depends on how close your hotel is to a spot where the taxi can dock. Can you ask your hotel for advice on this?