whoops let me format that right
This is the USGS mapping site, incredible tool.
Enter “Los Angeles, CA” and then you can select maps by year and Zoom way in.
http://historicalmaps.arcgis.com/usgs/
Still looking for Water/Sewer, found this
Interesting site: - Hidden Hydrology
https://www.hiddenhydrology.org/los-angeles-river-in-places-journal/
This is from when they redirected the LA River. There is info about abandonded, covered, unused, streams, etc. All this water was redirected, so these are like unfinished roads.
Still on it.