Images

Ice breaking up and metrologic instrumentation measures weather parameters on Devils Lake, near Devils Lake, ND.

Metrologic instrumentation measures weather parameters on Devils Lake, near Devils Lake, ND.

Wisconsin Department of Natural Resources employees measure current velocity and dissolved oxygen as part of a Long Term Resource Monitoring Program (LTRMP) partnership with the Upper Midwest Environmental Sciences Center (UMESC), Upper Mississippi River System (UMRS) Pool 8

Solar-powered streamgage in Secretary's homeland in Animas River above Tacoma, CO.

The lower two floors of the five-story building in the center of these photos have collapsed and the third floor has fallen to ground level.

Laura Coffey,a chemist at the National Water Quality Laboratory, loads on-line solid-phase extraction cartridges into the high-performance liquid chromatography/mass spectrometer (HPLC/MS) in preparation for testing and calibration

West-side of Houghton Lake during winter when frozen showing pressure cracks in ice.

Conowingo Dam on the Susquehanna River in Maryland.         

Roaring Spring on the McKenzie River, Oregon

Long Island, NY marshland

Cosby Creek under average flow conditions in Great Smoky Mountains National Park near the Cosby Campground near Cosby, TN

The Alluvial Fan is a fan-shaped area of disturbance in Rocky Mountain National Park. It was created on July 15, 1982, when the earthen Lawn Lake Dam above the area gave way, flooding the Park and nearby town of Estes Park with more than 200 million gallons of water. Enormous boulders were displaced, and trees and earth were ripped from the ground.

Sealcoat, marketed to protect and beautify the underlying asphalt, sharply contrasts here with the light gray of unsealcoated asphalt pavement. Read more about coal-tar-based sealcoat and PAHs here.

Coal-tar-based sealcoat, a potent source of polycyclic aromatic hydrocarbons (PAHs), abrades into fine particles with time.  Here, runoff containing abraded particles goes down a storm drain and is delivered to a nearby lake. Read more about coal-tar-based sealcoat and PAHs here.

The abrasive action of car tires and snow plows causes sealcoat to wear off. Here, light-colored patches indicate where the sealcoat has worn off and the underlying asphalt shows through.

Newly applied coal-tar-based sealcoat is dark black, sharply contrasting with the unsealed asphalt parking lot below. Coal-tar-based sealcoat is a potent source of polycyclic aromatic hydrocarbons (PAHs). 

Coal-tar-based sealcoat, a potent source of polycyclic aromatic hydrocarbons (PAHs), abrades into fine particles with time.  Here, runoff containing abraded particles goes down a storm drain and is delivered to a nearby lake. Read more about coal-tar-based sealcoat and PAHs here.

Bill Foreman, research chemist at the National Water Quality Laboratory, prepares a soil sample for the National Water Quality Assessment Program.

View of the apalachicola River looking upstream from in a bluff in the Nature Conservancy's Apalchicola Bluffs and Ravines Preserve.

Tom Custer, Ann Secord (USFWS), and Paul Dummer transport swallow boxes to place along the Hudson River, NY.

Chief Mountain