I just ran across this website and wanted to plug it. A lot of these watersheds are also open space and recreation areas, like Rancho Penasquitos - check out the article for that one specifically. There are multimedia links (including a great documentary by Jim Karnik) and links to other resources.
Image of Rancho Penasquitos Creek from sdrealtypros.com.
Note the thick brow-ridge, the idiotic grin, and the death-grip on the beverage. You can email this handsome devil at email@example.com.
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Rattlesnake Encounter Map
Have you run across one of our scaly friends on a trail in California? Take 5 seconds and add it to this map so we can see where interactions are more likely to take place, and make life safer for trail users.