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.
Images
The transition between a mud flat on the interior of Bob Allen Key (Florida Bay, Everglades National Park) and the mangroves that form the islands’ protective outer berm. These black mangroves have pneumatophores – parts of the root that function like snorkels, allowing the roots to “breathe” when water overlies the mud flat. Photo: Anna Wachnicka, FIU
The transition between a mud flat on the interior of Bob Allen Key (Florida Bay, Everglades National Park) and the mangroves that form the islands’ protective outer berm. These black mangroves have pneumatophores – parts of the root that function like snorkels, allowing the roots to “breathe” when water overlies the mud flat. Photo: Anna Wachnicka, FIU
USGS Biologist prepares to artificially spawn a female lake sturgeon in the laboratory at the Columbia Environmental Research Center.
USGS Biologist prepares to artificially spawn a female lake sturgeon in the laboratory at the Columbia Environmental Research Center.
A USGS scientist uses a remotely controlled "z-boat" to survey the experimental ponds at the Columbia Environmental Research Center.
A USGS scientist uses a remotely controlled "z-boat" to survey the experimental ponds at the Columbia Environmental Research Center.
USGS hydrologic technician Jayson Blom collects a water-level measurement at a monitoring well on the U.S. Department of Energy's Idaho National Laboratory site. During the summer of 2014, water levels measured at the site reached all-time lows.
USGS hydrologic technician Jayson Blom collects a water-level measurement at a monitoring well on the U.S. Department of Energy's Idaho National Laboratory site. During the summer of 2014, water levels measured at the site reached all-time lows.
U. S. Geological Survey Scientists Carol Johnson, Eric White and Tim McCobb prepare to deploy geophysical equipment in a coastal embayment April 9, 2015 in Falmouth, Massachusetts.
U. S. Geological Survey Scientists Carol Johnson, Eric White and Tim McCobb prepare to deploy geophysical equipment in a coastal embayment April 9, 2015 in Falmouth, Massachusetts.
Laboratory technician Amelia Ulmer filters water collected in the field, to be analyzed for environmental DNA in the laboratory of Dr. Margaret Hunter. This sample was tested for Burmese python eDNA, in a process similar to that developed by Dr. Hunter for manatee eDNA.
Laboratory technician Amelia Ulmer filters water collected in the field, to be analyzed for environmental DNA in the laboratory of Dr. Margaret Hunter. This sample was tested for Burmese python eDNA, in a process similar to that developed by Dr. Hunter for manatee eDNA.
One of six experimental stream segments used to study the dispersal of free embryo sturgeon at the Columbia Environmental Research Center. The stream segment is 5 meters long and 0.5 meters wide, and is filled with cobble-sized rock to a depth of 12 centimeters. Streams are covered during studies.
One of six experimental stream segments used to study the dispersal of free embryo sturgeon at the Columbia Environmental Research Center. The stream segment is 5 meters long and 0.5 meters wide, and is filled with cobble-sized rock to a depth of 12 centimeters. Streams are covered during studies.
Canyonlands National Park was one of four national parks established (1964) under the leadership of Interior Secretary Stewart Udall.
Landsat 8, acquired March 29, 2015.
Canyonlands National Park was one of four national parks established (1964) under the leadership of Interior Secretary Stewart Udall.
Landsat 8, acquired March 29, 2015.
The new, large research vessel (R/V) Arcticus will enable USGS Great Lakes Science Center scientists to explore fish health and water quality in Lakes Michigan and Huron.
The new, large research vessel (R/V) Arcticus will enable USGS Great Lakes Science Center scientists to explore fish health and water quality in Lakes Michigan and Huron.
A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting several crusty ventral scales from St. Martin Parish, Louisiana. SFD has proven lethal in many snakes, and the disease is recognized as an emerging threat to wild snake populations.
A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting several crusty ventral scales from St. Martin Parish, Louisiana. SFD has proven lethal in many snakes, and the disease is recognized as an emerging threat to wild snake populations.
A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting numerous nodules overlaid by roughened skin on the dorsal surface from St. Martin Parish, Louisiana. "FD has proven lethal in many snakes, and the disease is recognized as an emerging threat to wild snake populations.
A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting numerous nodules overlaid by roughened skin on the dorsal surface from St. Martin Parish, Louisiana. "FD has proven lethal in many snakes, and the disease is recognized as an emerging threat to wild snake populations.
A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting numerous nodules overlaid by roughened skin on the dorsal surface from St. Martin Parish, Louisiana. SFD has proven lethal in many snakes, and the disease is recognized as an emerging threat to wild snake populations.
A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting numerous nodules overlaid by roughened skin on the dorsal surface from St. Martin Parish, Louisiana. SFD has proven lethal in many snakes, and the disease is recognized as an emerging threat to wild snake populations.
A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting ulceration of the skin on the head from St. Martin Parish, Louisiana. SFD has proven lethal in many snakes, and the disease is recognized as an emerging threat to wild snake populations.
A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting ulceration of the skin on the head from St. Martin Parish, Louisiana. SFD has proven lethal in many snakes, and the disease is recognized as an emerging threat to wild snake populations.
San Jose Earthquakes' Avaya Stadium.
A USGS streamgage measures flooding in the lower Trinity River, Texas.
A USGS streamgage measures flooding in the lower Trinity River, Texas.
Re-vegetation in the river valley at the Elwha River restoration site. Image available at Olympic National Park flickr site.
Re-vegetation in the river valley at the Elwha River restoration site. Image available at Olympic National Park flickr site.
Pecos River at Old Crane Road bridge, Texas, downstream view. Photograph by Christopher Braun, U.S. Geological Survey, February 2015.
SIR 2019-5071
Pecos River at Old Crane Road bridge, Texas, downstream view. Photograph by Christopher Braun, U.S. Geological Survey, February 2015.
SIR 2019-5071
Pecos River near Malaga, New Mexico, downstream view. Photograph by Daniel Sinclair, U.S. Geological Survey, February 2015.
SIR 2019-5071
Pecos River near Malaga, New Mexico, downstream view. Photograph by Daniel Sinclair, U.S. Geological Survey, February 2015.
SIR 2019-5071
Hydrologist Charlie Culbertson holds an acoustic velocity meter under the ice covered river while standing under the covered bridge over the Ellis River at South Andover, Maine. This meter is used to collect streamflow information through the ice during the winter period.
Hydrologist Charlie Culbertson holds an acoustic velocity meter under the ice covered river while standing under the covered bridge over the Ellis River at South Andover, Maine. This meter is used to collect streamflow information through the ice during the winter period.
Bitter Lake National Wildlife Refuge south weir inflow, New Mexico, downstream view. Photograph by Daniel Sinclair, U.S. Geological Survey, February 2015.
SIR
Bitter Lake National Wildlife Refuge south weir inflow, New Mexico, downstream view. Photograph by Daniel Sinclair, U.S. Geological Survey, February 2015.
SIR
A brain coral boulder eight feet in diameter stands 750 feet inland in the British Virgin Islands. Geologists say that the coral was brought ashore, probably alive, by an unusual tsunami or storm between the years 1200 and 1480.
A brain coral boulder eight feet in diameter stands 750 feet inland in the British Virgin Islands. Geologists say that the coral was brought ashore, probably alive, by an unusual tsunami or storm between the years 1200 and 1480.