You mentioned in another thread that you're in the DC area. Where are you riding?
I ride a road bike on wooden bridges all the time. I generally avoid gravel since it's bumpy and dusty, but I can ride over short stretches of it with no trouble.
Also, if you give us a rough idea where you live, we can recommend some good bike shops. I personally love the Bike Lane in Burke and Reston, VA. IIRC, many people have good things to say about Proteus Bikes in College Park.
- 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