DandyDan: Anything that's a state road will be a numbered highway, or connecting link or spur, right? (I shoulda been more definitive in my response ^_^; )
I went driving over all 3 bridges (don't forget the one that already existed in Bellevue) the last two days and as near as I can tell, old US 34 is just city streets now in Plattsmouth. There are several "TO" banners that didn't previously exist, but in Nebraska, they have a tendency to forget "TO" banners, so sometimes, they have highways that aren't actually there signed as if they are.
US 34 does appear to have been removed from the old route west of I-29, but on 29 itself, the signage still has US 34 on it. They have these Clearview signs on old 34 now that they just made a couple years ago that they are going to have to redo, or remove. One unrelated note I find odd about the old US 34 interchange is that if you go east from there (on old-old US 34), you are on county L35 and I find that odd because it's either an east-west road or a diagonal, which means it should be county H-x or H-x-L. Granted, the road L35 is on goes through Glenwood and comes out the other side of Glenwood as L35 (this is old US 275), but there is no real connection between the two parts other than you don't turn at all to go from one to the other.
As for Bellevue, it appears NE 370 fades out east of US 75 (some signs still exist on gantries, and Fort Crook Road (old 73-75) still has signage directing you to NE 370), and appears gone by the time Harlan Drive reaches Galvin Road. OTOH, signage for Iowa 370 still exists.
I do wonder if it's all just a matter of time, though.
I'm not suggesting this bridge won't benefit area drivers, but I do question the decision to apply the US 34 designation to it. It seems to me this bridge will not benefit US 34 traffic.
- Original 34 went southwest from Glenwood on what is now CR L35. To get to US 75 in Plattsmouth, according to Google, that routing is 10.6 miles, and 17 minutes.
- Later they rerouted US 34 traffic more westerly from Glenwood to an I-29 interchange, then south, back to the original alignment. To get to the same point in Plattsmouth, that route added over 3 miles, and another 2 minutes of drive time.
- Now with this new bridge, to get to the same point in Plattsmouth will require an extra 6 miles (don't know the estimated drivetime, since Google doesn't yet have the road data).
I guess another way to think about it is: if you're going to take US 34 traffic that far north, then does it make sense to continue routing US 34 traffic back south through Plattsmouth? Once you're that far north, it seems to me the quickest route to Lincoln is now going to be simply continuing west on Platteview Road to I-80.
One possible other solution could have been to make it US 275. US 275 could hypothetically go north on US 75 to L St after crossing the new bridge. It does lose its historic connection to Council Bluffs if you do that, though. I would personally redo US 275 to go straight down Dodge with US 6 in Omaha. Not that anyone in Omaha would care about that.