Solar-powered streamgage in Secretary's homeland in Animas River above Tacoma, CO.
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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.
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
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.
West-side of Houghton Lake during winter when frozen showing pressure cracks in ice.
Conowingo Dam on the Susquehanna River in Maryland.
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
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.
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.
Black sealcoat contrasts with unsealcoated asphalt on parking lot
Black sealcoat contrasts with unsealcoated asphalt on parking lotSealcoat, 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.
Black sealcoat contrasts with unsealcoated asphalt on parking lot
Black sealcoat contrasts with unsealcoated asphalt on parking lotSealcoat, 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.
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.
Black newly applied sealcoat contrasts with unsealed asphalt
Black newly applied sealcoat contrasts with unsealed asphaltNewly 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).
Black newly applied sealcoat contrasts with unsealed asphalt
Black newly applied sealcoat contrasts with unsealed asphaltNewly 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.
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.
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.
Bill Foreman, research chemist at the National Water Quality Laboratory, prepares a soil sample for the National Water Quality Assessment Program.
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.
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.
Tom Custer, Ann Secord (USFWS), and Paul Dummer transport swallow boxes to place along the Hudson River, NY.
Chief Mountain
USGS conducts water quality sampling to describe changes in water quality along the deep channel of the San Francisco Bay-Delta system. Sampling includes continuious sampling and discrete sampling. Here a water discrete water sample is collected using a Niskin sampler at sunset in north San Francisco Bay.
USGS conducts water quality sampling to describe changes in water quality along the deep channel of the San Francisco Bay-Delta system. Sampling includes continuious sampling and discrete sampling. Here a water discrete water sample is collected using a Niskin sampler at sunset in north San Francisco Bay.
Long Island sod farm irrigation rig
Long Island sod farm irrigation rig
San Fracisco Bay, CA; Amy Little on Research Vessel Polaris, sampling for water quality constitutents.
San Fracisco Bay, CA; Amy Little on Research Vessel Polaris, sampling for water quality constitutents.