California State Parks Map - Highway Inaccuracies

[tawnuskgrevy]

I recently took a day trip to Samuel Taylor State Park (absolutely gorgeous, highly recommended) and noticed something somewhat odd/quirky about the GIS data used by the state for its parks. While the primary purpose of the map is ostensibly to zoom in on a specific state park in order to get information regarding campsites, picnic tables, hiking trails, etc, you can zoom out to take a wider look at all of California:

California State Parks map service

From a roadgeek perspective, the first interesting thing I noticed about this map is that it appears to have all the interstate, U.S., and state highway routes highlighted, with all other roads de-emphasized. However, the next thing I noticed was that it appears to also show a handful of deleted, superseded, or otherwise outdated pieces of highway as though they were current (here's an example of the Inland Empire, where the CA 30 routing on Highland Avenue and the CA 31 routing on Hamner Avenue are still shown alongside their modern day replacements, CA 210 and I-15 respectively):



And then here's southeastern Los Angeles county, showing the remnants of CA 42 along Firestone Boulevard and CA 90 on Imperial Highway, plus some ambiguity on the routing of CA 39 through the San Gabriel Valley (both the Hacienda/Glendora and Azusa alignments are shown):



My assumption is that this map was put together with either incomplete or out-of-date data, but that since highway documentation is not what the map is intended for, it's slipped through the cracks as not being important enough to fix.

Either way, figured if there were any people in the world that might be interested in taking a look, it'd be this forum. 

Let me know if you find anything else neat on here!

[Max Rockatansky]

Pertaining to just the two images inserted 83 is shown still north of Foothill along with CA 66 still existing on roadway it hasn't been on in ages.  CA 206 has also been gone for quite some time. 

[pderocco]

That's an Esri map. Blame it on them. No one who includes maps on a website makes their own. Even DOTs use commercial base maps, which often contradict the DOT data.

[Molandfreak]

That's an Esri map. Blame it on them. No one who includes maps on a website makes their own. Even DOTs use commercial base maps, which often contradict the DOT data.

I have previously posted about encountering an ESRI basemap with US 101 north of San Francisco marked as I-101.

[bing101]

Interesting that there's a CA-880 on the link with the OP at the MacArthur Maze in Oakland even though Locals call it Highway 880 its officially a 3di as in Interstate 880. 

[pderocco]

Interesting that there's a CA-880 on the link with the OP at the MacArthur Maze in Oakland even though Locals call it Highway 880 its officially a 3di as in Interstate 880.

It's worse than that. The map data looks almost 30 years out of date, as it doesn't even show the connection between I-880 and I-580.

[SeriesE]

CA-905 still showing on Otay Mesa Road in this map

[SeriesE]

Interesting that there's a CA-880 on the link with the OP at the MacArthur Maze in Oakland even though Locals call it Highway 880 its officially a 3di as in Interstate 880.

It's worse than that. The map data looks almost 30 years out of date, as it doesn't even show the connection between I-880 and I-580.

That might be because the map does not show interchange ramps, and the base map thinks the connector from 880 to 580/80 is a ramp instead of a mainline route.