we have a "winner". clhyer named the city, state, and location in the city. He's never been there, so maybe he can regale us as to how he solved this one?
Austin Texas, on the S. Congress Ave, on the Ann Richards Bridge. The bridge is over the Colorado River .. yes, Texas has its own Colorado -- distinct from the Colorado River that carved out the Grand Canyon, formed Lake Mead behind the Hoover Dam, etc..
The clues:
1. Self Evident now. Texas is between Rockies and Mississippi River .. so NOT on the Mississippi -- to focus you on the other Midwest cities.
2. The river in Austin is the Texas "Colorado" River. Begins and ends in Texas.
Colorado River (Texas) - Wikipedia
3. "1" -- of the 15 or so states, between the Rockies and the Mississippi, ONE state has ONE star on its flag, Texas, the
Lone Star State.
So that clue was designed to help narrow down the states with BIG modern cities on rivers -- Texas, Kansas, Missouri, Oklahoma -- with the most likely being Texas.
I'll start another game and then I am all out of locations that I know for sure. again, i encourage anyone who wants to "run the game" to put one up.
also its much better IF you know the place beforehand so we can be sure to have the correct answer/seek more clues if needed.