Neither are very large or really have a lot....I may not even have gone to Fort Caspar now that I think about it. We stayed at the Ft Caspar campground (right next door) and wandered around after hours, so maybe some of it was closed...it was certainly not memorable if it was open. I do remember the river and the ferry and that was nice.
Ft Bridger was an interesting stop and I enjoyed the visit, though it might be a little more of a detour than you might want if you are trying to get to Casper in one day. Unless there is some special happening an hour is all you would need. (of course it has been years since we went so things could have changed.)
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