Coyote Creek, the outflow of Whittier and La Habra Heights' system of ditches and channels, joins the San Gabriel about six miles from the ocean, in the northeast corner of Long Beach, not far from Cal State LB, El Dorado Park and Golf Course and Leisure World.
Tho' the view of the Creek from the bike path is mostly concrete, it's still a pleasant ride; keep heading north, even tho' it looks as though the path is ending - it goes a lot further than you think. Unfortunately, when it finally does terminate, it's in a dismal industrial area - but you're only a few blocks from the City of La Mirada, and its friendly bikepath, to the northeast.
At the southern end of Coyote Creek, the path, like the creek, joins the San Gabriel. See the Mid San Gabriel Trail page on this web site.
Thomas Guide, pages 737, 767, 796.