Tributaries
From north to south, the named tributaries of San Diego Creek are the La Cañada Channel (flowing from Laguna Canyon), Serrano Creek, Agua Chinon Creek, Bee Canyon Wash, Como Drain, Lyon Drain, Marshburn Channel, Coyote Canyon Channel, Peters Canyon Wash, Barranca Channel, Lane Channel, San Joaquin Wash, Sand Canyon Wash, and Bonita Creek.
The creek also has a few tributaries that provide the outflow for several water supply and flood control reservoirs in the San Joaquin Hills and Santa Ana Mountains. From source to mouth, these are La Cañada Channel (fed by Laguna Reservoir), Bee Canyon (two unnamed reservoirs), Peters Canyon Wash (Peters Canyon Reservoir), San Joaquin Wash (San Joaquin Reservoir) and Sand Canyon Wash (Sand Canyon and Strawberry Valley reservoirs).
The largest sub-tributaries include Borrego Canyon Wash (to Serrano Creek), Round Canyon (to Bee Canyon Wash), Santa Ana-Santa Fe Channel (to Peters Canyon) and Culver Drain (to San Joaquin Wash). There are many other ephemeral watercourses and drains in the watershed, but they are too numerous to list entirely.
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