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School Branch at Maloney Road near Brownsburg IN - measurement

School Branch at Maloney Road near Brownsburg IN - measuring stream width

School Branch at Maloney Road near Brownsburg IN - no flow

School Branch at Maloney Road near Brownsburg IN - stream measurement

Serapeum, a Roman Marketplace in Pozzuoli, Italy, records deformation of Campi Flegrei caldera over two millennia.

Northeast Region Photo Contest Winner | October 2018 | USGS at Work
USGS researchers deploying a prototype DTS fiber optic cable array in the Delaware River

A gravel bar on the north fork of the Agashashok River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.

Kankakee River at Davis, IN - camera on gage

USGS hydrologic technicians Keith Hein and Pete Elliott explain site selection and operation of USGS streamgages to staff members of the Kootenai Tribe of Idaho's Fish and Wildlife Department at streamgage station 12310100, Kootenai River at Tribal Hatchery near Bonners Ferry, Idaho.

View into Halema‘uma‘u from the west rim of Kīlauea's summit caldera. USGS photo: J. Kauahikaua, 03 March 2019

Aerial view due south of the Mono Lake-Long Valley volcanic region. Inset map shows locations of latest Pleistocene–Holocene silicic magmatic centers relative to Long Valley caldera. Rhyolites of the Mono–Inyo chain are shown in pink, and the dacitic–rhyodacitic Mammoth Mountain dome complex is shown in blue. U.S.

Huckleberry Ridge Tuff deposit exposed on Mt. Everts, near the northern boundary of Yellowstone National Park. The deposit was created by ash falling from the plume early in the eruption sequence, 2.08 million years ago. Photo by Madison Myers, Montana State University.

Lindsay Carlson swabbing hunter-harvested ducks in western Alaska as part of USGS research to investigate the persistence of avian influenza viruses in North American wetlands.  USGS scientists and colleagues found that influenza A viruses may remain infectious in surface waters of northern wetlands for more than seven months. 

An egret walks in the shallow surf of an undeveloped beach on Dauphin Island, Alabama, with buildings viewed in the background from a different area on the island.

Between 2009 and 2018, scientists conducted a national scale assessment of mercury accumulation in the National Park System using dragonfly larvae as biosentinels (species that accumulate a pollutant in their tissues as an index of exposure to other organisms without significant adverse effects to the biosentinel) through a citizen science network called the Dragonf

Photograph of the entrance to Grand Traverse Bay Harbor, located 8 kilometers downdrift of the spoils pile. Migration of the dark-colored stamp sands (moving from left to right) has buried the original beach, overtopped the wall, and partially blocked the channel.

Photograph of the R/V Rafael alongside dock near the survey site on Lake Superior.

Photograph showing a high scarp cut into the large pile of stamp sands at the town of Gay, Michigan. Nearly a century of erosion by waves and currents has transported millions of cubic yards of mine tailings along the coast and spread them across the adjacent lake floor.

Streamflow training at Blackrock Creek below Split Rock Creek near Moran, Wyoming. A new student intern learns how to measure streamflows upon arriving in Riverton just in time for high water.

A misty morning in the headwaters of the Akillik River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.

This map takes into account both probability of ignition and conditional probability of spread (to 500+ acres in East and 1000+ acres in West*) given ignition.