Mapping Center Answer:

If you have ArcGIS, some of items off your list are already available to you in the ArcGIS styles, specifically under the Water Wastewater Style. For some you wouldn't have to go to CAD first, others you might want to. If you open up the style and select one of the existing markers, go to its properties you will see that there is a drop down listing of the fonts available to use, scroll to the ESRI AMFM fonts and take a look at the contents to see if you can use those too. Weir is already in the exisiting style, but items like the Curb Inlet rectangles are contained in the fonts. There are no pattern fills for RipRap as yet.

As for sources, if you have CAD, then the parent company for that product may have some sets of symbols already made for use. Search on terms like, electrical and sewer as well as stormwater and wasterwater in general. Other references are the book series called Time-Saver Standards by De Chara and Crossie, Architectural Standards by Ramsey and Sleeper, and Engineering Design Graphics by James Earle.