Anybody know how long US 69\Overland Parkway in Overland Park, KS was signed as "Alternate 69" when first built? There's still a lot of people and businesses locally that refer to it as "Alternate 69" despite it not being signed like that for over 30 years.
Have you checked the Rural Resolutions website and GIS?
http://kdotapp2.ksdot.org/RuralResolutions/RuralResolutions.aspx
http://ksdot.maps.arcgis.com/home/webmap/viewer.html?webmap=dd8eab6c309645289649a46a27a86158
http://ksdot.maps.arcgis.com/home/
A casual check of the Rural Resolutions database for US 69 in Johnson County turns up a resolution dated 1969-11-12 saying that the then existing city street routing of US 69 would be retained as a detour routing until the US 69 freeway was finished and the old route was turned back to local agencies.
Wow -- lots of detail here. Noticed the original resolution listed (in error?) the northern part as US 269. However, no mention of it ever being designated as Alternate US-69.
Also, this would have happened the same time that the original US-69 designation on Metcalf (south of US-56/Shawnee Mission Pkwy) was switched to US-169, but I couldn't find anything on that on the Rural Resolutions site. I'm guessing this was probably around the late 1970's/early 80's when that happened.
Found some old KDOT maps at http://www.ksdot.org/bureaus/burTransPlan/maps/HistoricStateMaps.asp, along with info here: http://www.route56.com/highways/highways.php?hwy=169&seg=1&hist=1
Looks like the highway opened 1975-76 as Alternate 69, then changed to US-69 in 1981 when US-169 was rerouted to Metcalf.