Ah: Finally: Where the Walter Costa Trail Starts
Aha! The Walter Costa Trail starts inside the EBMUD vehicle parking lot. Not, I must say, where one would tend to look first for the start of a hiking trail...
http://www.ci.lafayette.ca.us/vertical/Sites/{C1C49B72-3D02-4C7B-82A7-92186ABD75FF}/uploads/{7D02A776-148A-4B34-8278-3ED618D9A700}.PDF: The trail begins on th enorth side of Mt. Diablo Blvd. at the signed entrance to the EBMUD yard across from the reservoir. The trail is paved from this point through the EBMUD yard to Pine Lane... [emphasis added]
