Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Sampling locations within the upper San Francisco Estuary shaded in blue polygons. Base map is a screen shot from Google Maps obtained on 4/21/14
Public Domain.
