Most of the bridges over the Potomac River here in the DC area have bike/pedestrian paths separated from the motor vehicle lanes. (At least I think so -- I'm pretty sure Chain Bridge has one, and I know the Key, 14th St, Roosevelt and Woodrow Wilson bridges all have them. The Memorial Bridge doesn't have barriers along the sidewalks but they are pretty wide.) Cyclists are not required to walk on them.
The Wilson Bridge is the new and improved bridge that opened a couple of years ago. It carries I-95/495 over the river to the east of DC. IIRC, there is a 15 mph speed limit on the bike/ped path. Some cyclists complained about that when it first opened, but really it is appropriate given the presence of pedestrians. I haven't ridden over this bridge yet, though I'd like to check it out, since I think it has some great views. One of these days...
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles