Historic Flood Photos

Valley Lows



Valleys are low lying, flood-prone areas between hills and mountains—and Tri-Valley refers to our location nestled among three valleys:

  • Amador Valley
  • Livermore Valley
  • San Ramon Valley

As such, the Tri-Valley has been subject to a number of floods over the years. Take a look back at our history of flooding below.


Christmas Eve flooding in 1955—two years before Zone 7 was created in part to provide flood protection—left much of northern Pleasanton, in the vicinity of where Hacienda Business Park now stands, under water.


Throughout the 90s a series of rainy years caused flooding in Tri-Valley.

Learn more about how we are strategically managing our flood channels to help protect our homes and businesses in the future on our Flood Protection System page.