San Diego Citizen Watershed Monitoring Consortium Friday, 10th February 
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SDCWMC > Watersheds

Tijuana Watershed

Map of Tijuana watershed


The Tijuana River Watershed spans the U.S. Mexico border and covers approximately 1,750 mi2, with one-third of watershed in California and two-thirds in Baja California. The natural resources are rich and varied. The watershed is located in an internationally recognized hotspot of biodiversity where a large number of threatened or endangered plant and animal species are found.

More than one million people live within the boundaries of the Tijuana River Watershed. There are many political jurisdictions that govern portions of the watershed including; the County of San Diego, the City of San Diego, the City of Imperial Beach, several Native American Reservations, and the municipalities of Tijuana, Tecate, and Ensenada. The States of California and Baja California also provide governance for areas of the watershed, as do federal agencies from Mexico and the United States.
Hydrologic Areas: Tijuana Valley, Potrero, Barrett Lake, Monument, Morena, Cottonwood, Cameron, Campo
Major Water Bodies: Tijuana River, Cottonwood Creek, and Tijuana Estuary

If you would like to select one of these major water bodies as your collection site, follow these instructions to get the information you will need for the registration form:

  • Go to iTouchMap.com.
  • If possible, enter the zip code of the area where you are collecting your sample in the "Address" field at the top of the page. If you don't know the zip code, enter the name of the watershed or city and state. Then, click the "Go" button. The comic book bubble will show the latitude and longitude on the map on that same page.
  • The first number is the latitude. The second is the longitude. These are the numbers you'll need to enter into the Collection Site Information section of the registration form.

If you need assistance in selecting a collection site, please contact us. We'll be happy to help you find a site that's as close to your group' or school's location as possible.