Well, gee, thanks for that most elegant example of constructive criticism. The bridge listings come from a list supplied by the government (which might explain a few things) that sometimes need a little editing. Perhaps you have access to the correct data you could supply?
The Shasta River does not go through Shasta County at all. The Shasta LAKE bridges were built in the 30's. So were the Shasta River Bridges in SISKIYOU County. et your facts and geography right.