Alan M Cressler (Former Employee)

Pole Bridge Creek is one of the sites investigated in the USGS Regional Stream Quality Assessment, during which water quality and ecological condition were sampled.

The headwaters of the Colorado and Gunnison Rivers was selected in 2019 as an Integrated Water Science Basin.

Corbett's Glen Nature Park, Town of Brighton, Monroe County, New York.  This was one of the sampling sites for the USGS Norheastern Stream Quality Assessment (NESQA).

Allen Creek, near the Town of Brighton, New York, flows over rock, creating the stunning Postcard Falls at Corbett's Glen Nature Park. Learn about the water quality of Allen Creek and other Northeast streams studied by the USGS Northeast Stream Quality Assessment here.

Cooling towers at a power-production facility

Thermoelectric power plant Bowen owned by Georgia Power Company, from Highway 113, Euharlee, Bartow County, Georgia. Plant Bowen is one of the largest coal-fired power plants in the United States. Plant Bowen uses recirculating cooling, decreasing the amount of water that must be withdrawn.

Latham River at Jekyll Island State Park, Georgia, where the river flows into Jekyll Sound. The health of the Jekyll Sound ecosystem is influenced by streamflow and the associated nutrient loads.

This green tree frog (Hyla cinerea) sits on the lip of a pitcher plant in a bog in Alabama. The frog was down in the pitcher plant, but moved up to rest on its edge as the photographer approached.

Pole Bridge Creek is one of the sites investigated in the USGS Regional Stream Quality Assessment, during which water quality and ecological condition were sampled.

Little Haynes Creek is one of the sites investigated in the USGS Regional Stream Quality Assessment, during which water quality and ecological condition were sampled.

USGS hydrologists and technicians use a kicknet to collect a sample of aquatic invertebrates for an ecological survey on South Fork Broad River iin Georgia. Broad River was one of the sites investigated in the USGS Regional Stream Quality Assessment, during which water quality and ecological condition were sampled.

An ARMI amphibian monitoring site at St. Marks National Wildlife Refuge, Wakulla County, Florida.

Hillabahatchee Creek, GA; Nick Henry and Jeff Riley doing Rich Target Habitat (RTH) sampling.

USGS employee Paul Ankorn making a discharge measurement at USGS gage 02177000 Chattooga River near Clayton, GA.

USGS sampled water quality at this location on Chickasawhatchee Creek, Terrell County, Georgia.

Aneides aeneus (Green salamander) Howards Waterfall Cave, Southeastern Cave Conservancy Preserve, Dade County, Georgia 1.

USGS employees conduct water quality sampling with DH-81: USGS gage 02335870 Sope Creek near Marietta, GA.

Taylor Slough in the setting sun.

The longear sunfish is a freshwater fish in the sunfish family. An increase in sunfish in southeastern streams, intentionally stocked or unintentionally transplanted, has caused the composition of fish species among streams in the Southeast to become more similar. Such homogenization of species is an emerging and pervasive threat to biodiversity.

Noses Creek at Powder Springs Road, Georgia. Part of the USGS safety protocol is to wear a PFD (personal flotation device) around any surface water. This scientist may not look like he has one on, but he does--it is under his rain coat. This DH-81 sampler is used to sample flood water for suspended-sediment concentrations and water quality.

A USGS scientist about the collect a water sample with a DH-95 sampler (the white torpedo looking device). After sampling, another scientist takes the bottle of water and pours it into the churn. Having another scientist do this prevents contamination of the sample.