What an insane decision. I have to use gmaps for work and even basic routing has started to not make sense.
Oh what the fuck
I was curious about that one, but it looks like that might be coming from the county level GIS data which shows the straight line course.
Schnider GeoSpatial is a popular vendor for local governments. That map is part of their property search tool for looking up parcel information. The data is generally sourced from the municipality which purchased it.
They are borderline ubiquitous when it comes to looking up parcel information to the point that you can actually search for parcel data across large portions of the US.
If you search "County Name Property Search" you will probably land on a city/county web page that links to qPublic.net and a few other tools.
qPublic is singularly focused on parcel info.
I didn't track down the county streams layer (because im lazy), while browsing through basemaps options, I did see that a USGS basemap that had the stream following the southern edge of the parcel.
There were also some others with some even stranger courses.