Images

Indiana Harbor Canal at East Chicago, IN - gage house

Stream gage house at Little Menomonee River near Freistadt (04087050), during high water.

U.S. Geological Survey field crew sampling invertebrates at South Branch Rush River, MN.

Lake Whitefish from our fall survey.

Voyageurs National Park (VNP), a pristine setting with abundant lakes, wetlands, and streams situated on granitic bedrock, is located near northern Minnesota's border with Canada. Long-term studies at VNP have revealed trends in mercury concentration in precipitation, surface water, and fish.

Mark Sandheinrich and Sean Bailey of the University of Wisconsin - La Crosse sampling fish from a canoe on Shoepack Lake in Voyageurs National Park.

Mark Sandheinrich and Sean Bailey of the University of Wisconsin - La Crosse sampling fish from a canoe on Shoepack Lake in Voyageurs National Park. A burned tree is in the foreground from a previous wildland fire.

Cuyahoga River at Independence OH - downstream from bridge

Cuyahoga River at Independence OH - river section submerged

Grey Tree Frog

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

This native leafcutter bee, Trachusa zebratum, is a solitary bee species associated with sandy soils where the female builds her own nest to lay her eggs in.

This cuckoo bee, or Nomada vegana, is a native bee species associated with open grassland habitats in northwest Indiana. It is a parasitic bee that lays its eggs in nests of other bees.

A Sundew plant taken at the Indiana Dunes National Lakeshore, Indiana

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.

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.

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.

Two passive samplers (mini Semi-Permeable Membrane Devices or “SPMDs”) prior to a onemonth deployment for measurement of organic contaminants.

Pitcher Plants at Indiana Dunes National Lakeshore.