Images

Cold-water adapted macroinvertbrates like these are good indicators for the health of an ecosystem.

In 2013, installation of macroinvertebrate sampling devices at seven sites on the Silver Creek Preserve. The sampling devices provide artificial substrate that aquatic insects such as mayflies, caddisflies, and stoneflies can colonize.

USGS, Nature Conservancy, Idaho Fish and Game, and other volunteers collect fish on the Silver Creek Preserve near Picabo, Idaho.

Hester Dendy™ samplers like this one provide artificial substrate that aquatic insects can colonize.

Collection and comparison of pre- and post-restoration samples to assess how well the insects adapt to restoration efforts.

Before The Nature Conservancy established the Silver Creek Preserve, the watershed had been degraded by years of livestock grazing and overfishing. Preserve managers have been concerned about sedimentation, increasing stream temperatures, and invasive species.

USGS hydrologist Dan Thomas places an acoustic Doppler current profiler (ADCP) into Fargo, N.D., floodwaters to measure streamflow on the Red River.

USGS hydrologist Dan Thomas speaks with media about USGS flood response efforts in Fargo, N.D.

A high water marker is submerged by the rising Red River during flooding in Fargo, N.D.

USGS hydrologists measuring streamflow on the Red River during spring flooding in Fargo.

Red River floodwater in downtown Fargo, N.D., overcame a public trail sign in April 2013.

The USGS Red River of the North at Fargo streamgage in Fargo, N.D., takes automatic water level measurements every 15 minutes.

USGS hydrologist Dan Thomas shows media how the acoustic Doppler current profiler (on the right) measures streamflow on the Red River in Fargo.

A team of USGS hydrologists and technicians prepares to take an acoustic Doppler current profiler (ADCP) out on the Red River in downtown Fargo, N.D., to measure streamflow during the 2013 flood.

USGS hydrologists return from measuring streamflow on the Red River in Fargo, N.D. The USGS Red River of the North at Fargo streamgage can be seen on the right in the image.

Illustration of the water cycle. Prepared by James R. Douglas, USGS. Published in USGS Circular 1383G: USGS Water Science Strategy—Observing, Understanding, Predicting, and Delivering Water Science to the Nation.

Two of the main spring discharge points of Comal springs.

A new website now provides important information about streamflow in the Comal and San Marcos Rivers and springflow at Comal and San Marcos Springs.

Looking northeast along the Bear River Duck Club Canal toward the Wellsville Mountains. 

Mixing of drill cuttings with absorbent polymer prior to shipping and disposal in a secured landfill.

Scientists apply a new method for determining the fate of methane discharged into streams. Here, noble-gas (krypton) is injected using submerged gas-permeable tubing in West Bear Creek, North Carolina. 

Inside look of a gorge in Lake Mead.