No Authoritative Website

[Andi]

What if an authoritative website cannot be found for a feature? Is the next option driving by the Google address to confirm it's address/existence?

[Erin @ USGS]

You can definitely 'drive by' using Google street view but never use the address provided by Google.  If you cannot find an authoritative website try to get a hold of a phone number using the Yellow pages or another source and give the location a call the verify the attributes.