So since I had a PR in already for the MT 77 addition, I was looking around to see if there was any minor route cleanup elsewhere in MT that I could throw in. However, S-290 has a bit more than a "minor" issue. The HB still has the route as it was before the new Bozeman Airport entrance (I-90 Exit 299) and as such cannot be traveled anymore. Digging around, it seems that MDT rerouted S-290 along Airway Blvd to S-205, and that would be all fine and dandy but there's no signage for the reroute whatsoever. In fact, the only signage I could find for 290 was at the old south end at S-291... which now just dumps you into the Belgrade street grid with no good way to access the rest of 290. Should I adjust 290 to the Airway Blvd endpoint or to where MDT GIS says the signage ends north of the airport?
Additionally, S-205 isn't signed in Belgrade proper, with "TO 205" signs where reassurance shields rightfully should be. Not sure that's worth breaking the route given there's no real indication it's not 205 anymore, but it's something else to consider.