I've collected photos of the construction of Highway 90A from several sources, but most of these I received from Terrell Smith. (Thank you.)
The Highway was paved in 1927 as a two-lane road. Those of you who remember it was a four-land road will understand when I say it was the westbound (or northern) lanes that were first paved. Bridges and other support structures were built before the paving was done.
Sugar Land was still isolated after the road was improved, but it wasn't quite as isolated as it was before.
The annotations say these were taken east of town between Sugar Land and Stafford. I've taken a close look at the horizon in all the photos, and the annotations seem to be correct.