Narrow bridges or bridges with weight limits.

Thanks for all your suggestions. I have the Rand McNally atlas which is useful, but I was thinking more along the lines of a POI database or a website with a list of locations so I could make my own. Failing that, if anyone knows of a narrow bridge location I would very much appreciate it if you could share.

I keep seeing lowclearances.com being mentioned. Has anyone used their bridge height data?