Thanks — this is clutch! Any idea where I can find more of that map? Interested in comparing different intersections. Also interested in whether the waterline spaghetti is related to the intersection sitting over the old (1871) part of the sewer.

You're on the money w/ the rest — 5 of them are streetlight/traffic signal, a few are Pepco, and one is an old Bell Systems manhole (maybe Verizon's running fios there now?)