Regions

In this image, a Gunnison prairie dog eats a bait laden with the sylvatic plague vaccine. Prairie dogs in the wild are less likely to succumb to plague after they ingest peanut-butter-flavored bait that contains a vaccine against the disease.

USGS scientists take samples of Lafferty Gulch surface water, which was analyzed for perchlorate and metals.

A series of time-lapse photographs capture rapid water-level fluctuations in the vicinity of Wildwood Islands in the Sheboygan River, 4.4 km upstream of Lake Michigan near Sheboygan, Wis. The fluctuations are caused the interaction of seiche-related oscillations from Lake Michigan with river flows. 
 

Platte River from the observation tower near South Bend, Nebraska.

A series of time-lapse photographs capture rapid water-level fluctuations in the vicinity of Wildwood Islands in the Sheboygan River, 4.4 km upstream of Lake Michigan near Sheboygan, Wis. The fluctuations are caused the interaction of seiche-related oscillations from Lake Michigan with river flows. 
 

Bald Eagle Lake near the Twin Cities, Minnesota. 

Ice formation on Apple Creek near Menoken, ND (USGS streamgage 06349500; https://waterdata.usgs.gov/nd/nwis/inventory/?site_no=06349500&agency_cd=USGS&) on March 10, 2011. Marker (3 feet 10 inches) stands next to ice spike. The 2010-11 winter

Ice formation on Big Muddy Creek near Almont, ND (USGS streamgage 06347500;
https://waterdata.usgs.gov/nd/nwis/inventory/?site_no=06347500&agency_cd=USGS&) on March
3, 2011. USGS personnel stands next to ice formation at Big Muddy

Ice formation on Apple Creek near Menoken, ND (USGS streamgage 06349500;
https://waterdata.usgs.gov/nd/nwis/inventory/?site_no=06349500&agency_cd=USGS&) on
January 13, 2011. Small ice mounds developed downstream from weir on Apple

Lock and Dam 7 Panorama

Silver carp (Hypophthalmichthys molitrix) jumping out of the Illinois River.