Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Pete Lenaker is a Supervisory Physical Scientist and Water Quality Assessment Team Lead with the Upper Midwest Water Science Center.
Multi-parameter meter installed at Milwaukee River Cherry Street streamgage location. https://waterdata.usgs.gov/monitoring-location/040870115
Multi-parameter meter installed at Milwaukee River Cherry Street streamgage location. https://waterdata.usgs.gov/monitoring-location/040870115
Milwaukee River at Cherry Street Bridge looking downstream into downtown Milwaukee. https://waterdata.usgs.gov/monitoring-location/040870115
Milwaukee River at Cherry Street Bridge looking downstream into downtown Milwaukee. https://waterdata.usgs.gov/monitoring-location/040870115
Large-volume microplastics sampler with pump and flow meter next to field vehicle.
Large-volume microplastics sampler with pump and flow meter next to field vehicle.
North Branch Oak Creek at South Wildwood Drive at Oak Creek, Wisconsin looking upstream during summer.
North Branch Oak Creek at South Wildwood Drive at Oak Creek, Wisconsin looking upstream during summer.
Looking upstream Oak Creek at South 31st Street in Franklin, Wisconsin, in summer. https://waterdata.usgs.gov/monitoring-location/04087188
Looking upstream Oak Creek at South 31st Street in Franklin, Wisconsin, in summer. https://waterdata.usgs.gov/monitoring-location/04087188
Looking upstream Underwood Creek Tributary near Oak Leaf Trail at West Allis, Wisconsin, during summer. https://waterdata.usgs.gov/monitoring-location/0408708573/
Looking upstream Underwood Creek Tributary near Oak Leaf Trail at West Allis, Wisconsin, during summer. https://waterdata.usgs.gov/monitoring-location/0408708573/
Close up view of a Turner C3 submersible fluorometer sensors. Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper.
Close up view of a Turner C3 submersible fluorometer sensors. Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper.
Flow-through sensor for measurement of three different optical signals.
Flow-through sensor for measurement of three different optical signals.
Photograph of a 24-bottle automatic sampler to collect water samples for optical properties of water and microbiological analyses.
Photograph of a 24-bottle automatic sampler to collect water samples for optical properties of water and microbiological analyses.
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 16th St. in Milwaukee, Wisconsin.
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 16th St. in Milwaukee, Wisconsin.
Prefilter and Ultrafilter assembly from Menomonee River at 16th St., Milwaukee, WI.
Prefilter and Ultrafilter assembly from Menomonee River at 16th St., Milwaukee, WI.
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.
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.
Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.
Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.
Custom-designed, automated, large-volume virus water sample filtration and collection system at Underwood Creek, WI.
Custom-designed, automated, large-volume virus water sample filtration and collection system at Underwood Creek, WI.
A USGS scientist collecting a discrete water-quality sample.
A USGS scientist collecting a discrete water-quality sample.
Little Muskego Lake, WI sediment core mounted on sediment extrusion device.
Little Muskego Lake, WI sediment core mounted on sediment extrusion device.
USGS scientist inspects three sediment cores from Lake Mendota, WI prior to sediment extrusion.
USGS scientist inspects three sediment cores from Lake Mendota, WI prior to sediment extrusion.
0.50 cm section of lake sediment from Lake Mendota, WI.
0.50 cm section of lake sediment from Lake Mendota, WI.
A photograph of U.S. Geological Survey (USGS) custom automated pathogen sampler (top) and schematic illustrating the remote-unattended-automated pathogen sampler (bottom). Sample collection proceeds over the course of a runoff-event or low-flow period for up to a maximum of 5 days before a site visit by personnel is needed to collect the samples.
A photograph of U.S. Geological Survey (USGS) custom automated pathogen sampler (top) and schematic illustrating the remote-unattended-automated pathogen sampler (bottom). Sample collection proceeds over the course of a runoff-event or low-flow period for up to a maximum of 5 days before a site visit by personnel is needed to collect the samples.
USGS scientist collecting sediment core from Little Menomonee River, Milwaukee, WI.
USGS scientist collecting sediment core from Little Menomonee River, Milwaukee, WI.
Surface water sampling for microplastics in Lake Michigan near Milwaukee, WI.
Surface water sampling for microplastics in Lake Michigan near Milwaukee, WI.
Multi-parameter meter installed at Milwaukee River Cherry Street streamgage location. https://waterdata.usgs.gov/monitoring-location/040870115
Multi-parameter meter installed at Milwaukee River Cherry Street streamgage location. https://waterdata.usgs.gov/monitoring-location/040870115
Milwaukee River at Cherry Street Bridge looking downstream into downtown Milwaukee. https://waterdata.usgs.gov/monitoring-location/040870115
Milwaukee River at Cherry Street Bridge looking downstream into downtown Milwaukee. https://waterdata.usgs.gov/monitoring-location/040870115
Large-volume microplastics sampler with pump and flow meter next to field vehicle.
Large-volume microplastics sampler with pump and flow meter next to field vehicle.
North Branch Oak Creek at South Wildwood Drive at Oak Creek, Wisconsin looking upstream during summer.
North Branch Oak Creek at South Wildwood Drive at Oak Creek, Wisconsin looking upstream during summer.
Looking upstream Oak Creek at South 31st Street in Franklin, Wisconsin, in summer. https://waterdata.usgs.gov/monitoring-location/04087188
Looking upstream Oak Creek at South 31st Street in Franklin, Wisconsin, in summer. https://waterdata.usgs.gov/monitoring-location/04087188
Looking upstream Underwood Creek Tributary near Oak Leaf Trail at West Allis, Wisconsin, during summer. https://waterdata.usgs.gov/monitoring-location/0408708573/
Looking upstream Underwood Creek Tributary near Oak Leaf Trail at West Allis, Wisconsin, during summer. https://waterdata.usgs.gov/monitoring-location/0408708573/
Close up view of a Turner C3 submersible fluorometer sensors. Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper.
Close up view of a Turner C3 submersible fluorometer sensors. Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper.
Flow-through sensor for measurement of three different optical signals.
Flow-through sensor for measurement of three different optical signals.
Photograph of a 24-bottle automatic sampler to collect water samples for optical properties of water and microbiological analyses.
Photograph of a 24-bottle automatic sampler to collect water samples for optical properties of water and microbiological analyses.
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 16th St. in Milwaukee, Wisconsin.
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 16th St. in Milwaukee, Wisconsin.
Prefilter and Ultrafilter assembly from Menomonee River at 16th St., Milwaukee, WI.
Prefilter and Ultrafilter assembly from Menomonee River at 16th St., Milwaukee, WI.
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.
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.
Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.
Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.
Custom-designed, automated, large-volume virus water sample filtration and collection system at Underwood Creek, WI.
Custom-designed, automated, large-volume virus water sample filtration and collection system at Underwood Creek, WI.
A USGS scientist collecting a discrete water-quality sample.
A USGS scientist collecting a discrete water-quality sample.
Little Muskego Lake, WI sediment core mounted on sediment extrusion device.
Little Muskego Lake, WI sediment core mounted on sediment extrusion device.
USGS scientist inspects three sediment cores from Lake Mendota, WI prior to sediment extrusion.
USGS scientist inspects three sediment cores from Lake Mendota, WI prior to sediment extrusion.
0.50 cm section of lake sediment from Lake Mendota, WI.
0.50 cm section of lake sediment from Lake Mendota, WI.
A photograph of U.S. Geological Survey (USGS) custom automated pathogen sampler (top) and schematic illustrating the remote-unattended-automated pathogen sampler (bottom). Sample collection proceeds over the course of a runoff-event or low-flow period for up to a maximum of 5 days before a site visit by personnel is needed to collect the samples.
A photograph of U.S. Geological Survey (USGS) custom automated pathogen sampler (top) and schematic illustrating the remote-unattended-automated pathogen sampler (bottom). Sample collection proceeds over the course of a runoff-event or low-flow period for up to a maximum of 5 days before a site visit by personnel is needed to collect the samples.
USGS scientist collecting sediment core from Little Menomonee River, Milwaukee, WI.
USGS scientist collecting sediment core from Little Menomonee River, Milwaukee, WI.
Surface water sampling for microplastics in Lake Michigan near Milwaukee, WI.
Surface water sampling for microplastics in Lake Michigan near Milwaukee, WI.