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.
USGS staffers Dan Edwards and Gary Wall attach a hydroacoustic and turbidity equipment package to a tripod for deployment on the bottom of the Hudson River near Poughkeepsie, NY
Public Domain.
