Images

Close up-view of defined area of the stream bottom where attached invertebrates are removed with a brush and washed into the Surber net; where possible, a hand rake is also used to dislodge organisms from shallow depths.

Flow-through sensor for measurement of three different optical signals.

Human-specific virus filtration units with 10-micron nominal pore size string-wound pre-filter and dead-end ultrafilter after a five-day composite sampling event with the Menomonee River in background. Menomonee River at 16^th St. in Milwaukee, Wisconsin.

Ultrafilters are used to concentrate pathogens from large-volume surface water samples. Plastic autoclaved bottles used for human-associated indicator bacteria analysis. Glass bottle used for DOC, simultaneous fluorescence and absorbance, and pharmaceutical compound analysis.

Photograph of a 24-bottle automatic sampler to collect water samples for optical properties of water and microbiological analyses.

Prefilter and Ultrafilter assembly from Menomonee River at 16th St., Milwaukee, WI.

Particulate matter captured on a quartz fiber filter at the Mercury Research Laboratory.

Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.

Native birds resting on marker buoys in Brownlee Reservoir, Idaho.

Draining overlying water from sedimentation sampler at Brownlee Reservoir, Idaho.

Conduit associated with stream gage at Menomonee at 16th Street in Milwaukee (04087142).

USGS scientists use a backpack-mounted electrofishing device to sample fish communities in a small and shallow Milwaukee-area stream.

A USGS hydrologist documents a flooded street near the Sugar River in Verona, Wisconsin. This image was taken after the area received near-record rainfall on August 20, 2018.

An example stream reach of Underwood Creek’s channel in 2018 after rehabilitation.

Custom-designed, automated, large-volume virus water sample filtration and collection system at Underwood Creek, WI.

Surficial sediment collection on Wilson Park Creek, Milwaukee, WI.

Sunset on the Milwaukee River at Estabrook Park.

Bedload sample collected from the Durand bridge.

View of Durand Bridge and sampling crew from boat during multibeam bathymetry survey.

Example excitation-emission spectra from analysis of raw wastewater and stream samples using a laboratory-based instrument.

A USGS scientist collecting a discrete water-quality sample.