You can buy a bridge kit with a hinge (they aren't cheap) from Bridgeboss or Trainlayouts.com (both forum sponsors I agree), they aren't cheap, but they have bridges that can meet the bill.
My current thoughts ,fwiw.
1)Use a hinged bridge to allow it to be swung up. Some of the bridge makers have a hinge kit to make it turnkey.
2)Use a 'drop bridge' that is the opposite of an 'up bridge'. The late Jim Barrett had articles describing his build, should be in Ogaugrr archives.
3)A bridge you physically lift out of place and then put back.
4)A bridge that can be raised up (like a prototype lift bridge). Would love to do that, but with a low ceiling in my basement not sure it would work.
I am leaning towards 3) above. I would have pins that would fit into the base support to make sure it is aligned. The other thing is having power get to the bridge, I'll prob use contacts in the base for the negative and positive power. My opening is 33", so not huge, will be a double track bridge. Downside is any time you handle it, could cause damage
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