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 Hydrologic Technician prepares a remote control boat with an Acoustic Doppler Current Profiler (ADCP) and Global Positioning System (GPS) to gather water-discharge measurements in rivers and streams.
Public Domain.
