US 99A via the Pacific Highway alignment in Blaine, WA

[Max Rockatansky]

I'm noticing on some USGS maps of Blaine, WA the original alignment of the Pacific Highway (now partially WA 543) and pre-1940 US 99 are displayed as US 99A.  These appear on the 1950s map editions which would have put it past US 99 being rerouted to BC 99 and King George Highway via the Peace Arch.  This would make sense given Pacific Highway on the Canadian side was assigned as BC 99A. 

The trouble I'm having is that I can't find any AASHTO documentation showing US 99A in Blaine to be an officially sanctioned thing. I know Washington was stingy on asking for alignment shifts and bannered routes.  All the same they did ask AASHO for an official US 99A north of Bellingham in 1952.  I was just curious if anyone had any documentation from other sources for this Blaine.

[Bickendan]

That application's probably with OTC/ODOT's application of moving US 26 off of Market/Clay and Front to I-405-Broadway/5th-Sheridan-3rd-Arthur [/snark]

I've been curious on US 99's routing north of Bellingham, and while there seems to be a logical non-I-5 RoW, there a couple plausible alternates.

[Max Rockatansky]

That application's probably with OTC/ODOT's application of moving US 26 off of Market/Clay and Front to I-405-Broadway/5th-Sheridan-3rd-Arthur [/snark]

I've been curious on US 99's routing north of Bellingham, and while there seems to be a logical non-I-5 RoW, there a couple plausible alternates.

Been working on that myself.  I have the initial alignment through Ferndale down but I still haven't worked out when the shift on both sides of town happened in the 1930s.  US 99 moved to a full bypass via the Nooksack River Bridge now part of NB I-5 in 1955.