Images

Clouds saturate a forest area in ‘Īao Valley, Maui through the process of cloud-water interception.

Freshwater waterfall in lush green forested area named Wailua Iki Falls, Maui.

This is an example of an OnDemand 1:100,000 scale or 100K Topo map of Yuba City, California. 

Area coverage difference between 100K Topo extent (red outline) and 7.5-Minute Topo (black outline) extent. 

Topobathymetric digital elevation model of the Kootenai River, Idaho. Image was created by Cindy Thatcher.

A USGS scientist collects water quality samples in the Grand Canyon in Arizona. 

Photo of a lush green forested area around Makamaka‘ole Stream near Kānoa Ridge, Maui.

Photo of lush green forested area around Makamaka‘ole Stream near Kānoa Ridge, Maui.

Cloud covered forest landscape in Nakula, Maui with outlines of trees in the distance.

The U.S. Geological Survey (USGS) often employs specific types of soil moisture probes to monitor watersheds, creeks, and streams as part of their hydrological studies and environmental monitoring efforts.

The Yurok Tribe, one of the largest Native American tribes in California, has ancestral lands primarily located along the lower 45 miles of the Klamath River and the Pacific coast in the northwestern part of the state. These lands are situated in what is today Humboldt and Del Norte counties.

Salt deposits outside Moab, UT. USGS scientists are studying how salinity in the Upper Colorado Basin has changed over time and how factors like irrigation and climate influence salinity.

Salt deposits along the Paria River, UT. USGS scientists are studying salinity in the Upper Colorado Basin.

The Dolores River, CO, a tributary of the Colorado River. USGS scientists are studying salinity in the Upper Colorado Basin.

A Hydrologic Imagery Visualization and Information System (HIVIS) camera along the San Antonio River in San Antonio, Texas. The camera is used to verify the position of a gate that is operated by the City of San Antonio. Check out the camera here.

Bird's eye view of the Great Salt Lake's railroad causeway, where pink hypersaline waters of the north arm meet the blue-green waters of the south arm. The breach in the causeway allows water exchange between the two sides.

A rocky causeway divides the waters of the Great Salt Lake, with distinct color variations visible between the north and south arms.

An adult female River Cooter, left, and an adult female federally-Threatened Ringed Map Turtle, right, bask in the sun near Covington, Louisiana. (Courtesy photo). 

A soil moisture data logger buried in the ground is a specialized instrument designed to measure and record the moisture content of soil over time. Here's how it generally functions:

This USGS webcam footage shows the Kennebec River in Augusta, Maine, flooding after a large coastal storm hit much of the East Coast and battered New England with heavy rains and winds. USGS image.

Learn more about this monitoring site.

Trent Watts, a USGS hydrologic technician, uses an Acoustic Doppler Current Profiler to measure the amount of water flowing in Perkiomen Creek in Graterford, Pennsylvania, on December 18. USGS photo by Cameron Ensor.