Multi-parameter meter installed at Milwaukee River Cherry Street streamgage location. https://waterdata.usgs.gov/monitoring-location/040870115
Peter L Lenaker
Pete Lenaker is a Physical Scientist with the Upper Midwest Water Science Center.
Science and Products
MMSD Watercourse Corridor Study: Contaminants in Water and Sediment
There are many kinds of chemical, physical, and biological contaminants contained in water and sediment, and new or “emerging” contaminants are continually being discovered. USGS investigations of contaminants in the MMSD Watercourse Corridor Study include studies of PFAS, PAHs, microplastics, and wastewater contamination as well as modeling long-term trends in water quality.
Human and Bovine Virus Prevalence in Some Great Lakes Tributaries Influenced by Watershed-Specific and Seasonal Characteristics
Human enteric and bovine-specific viruses were detected in eight Great Lakes tributaries. Presence and concentration of human viruses increased in watersheds with greater than 25 percent urban influence and more than 2,900 people per square kilometer. Similarly, bovine viruses increased in watersheds having greater than 40 percent agricultural land influence and cattle densities greater than 50...
Filter Total Items: 24
Multi-parameter meter installed at Milwaukee River Cherry Street streamgage
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
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
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
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.
Oak Creek at South 31st Street at Franklin, Wisconsin
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
Underwood Creek Tributary near Oak Leaf Trail at West Allis, Wisconsin
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/
Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper
linkClose up view of a Turner C3 submersible fluorometer sensors. Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper.
Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper
linkClose 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.
Flow-through sensor for measurement of three different optical signals.
24-bottle automatic sampler to collect water samples
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.
Prefilter and Ultrafilter assembly from Menomonee River, WI
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 and bottles
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 Dissolved Organic Matter and Tryptophan sensors
Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.
Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.
Large-volume virus water sample filtration and collection system
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.
A USGS scientist collecting a discrete water-quality sample.
Little Muskego Lake sediment core mounted on sediment extrusion device
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.
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.
Lake sediment slice Lake Mendota
0.50 cm section of lake sediment from Lake Mendota, WI.
0.50 cm section of lake sediment from Lake Mendota, WI.
A custom automated pathogen sampler and schematic illustration.
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.
Scientist collecting sediment core from Little Menomonee River, WI
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
Surface water sampling for microplastics in Lake Michigan near Milwaukee, WI.
Surface water sampling for microplastics in Lake Michigan near Milwaukee, WI.
Custom-designed net for sampling microplastics at depth, Lake Michigan
Custom-designed net for sampling microplastics at depth, Lake Michigan.
Custom-designed net for sampling microplastics at depth, Lake Michigan.
Science and Products
MMSD Watercourse Corridor Study: Contaminants in Water and Sediment
There are many kinds of chemical, physical, and biological contaminants contained in water and sediment, and new or “emerging” contaminants are continually being discovered. USGS investigations of contaminants in the MMSD Watercourse Corridor Study include studies of PFAS, PAHs, microplastics, and wastewater contamination as well as modeling long-term trends in water quality.
Human and Bovine Virus Prevalence in Some Great Lakes Tributaries Influenced by Watershed-Specific and Seasonal Characteristics
Human enteric and bovine-specific viruses were detected in eight Great Lakes tributaries. Presence and concentration of human viruses increased in watersheds with greater than 25 percent urban influence and more than 2,900 people per square kilometer. Similarly, bovine viruses increased in watersheds having greater than 40 percent agricultural land influence and cattle densities greater than 50...
Filter Total Items: 24
Multi-parameter meter installed at Milwaukee River Cherry Street streamgage
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
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
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
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.
Oak Creek at South 31st Street at Franklin, Wisconsin
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
Underwood Creek Tributary near Oak Leaf Trail at West Allis, Wisconsin
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/
Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper
linkClose up view of a Turner C3 submersible fluorometer sensors. Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper.
Multi-parameter meter with FDOM, Tryptophan, Turbidity, and Temperature sensors and central wiper
linkClose 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.
Flow-through sensor for measurement of three different optical signals.
24-bottle automatic sampler to collect water samples
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.
Prefilter and Ultrafilter assembly from Menomonee River, WI
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 and bottles
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 Dissolved Organic Matter and Tryptophan sensors
Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.
Chromophoric (colored) Dissolved Organic Matter (CDOM) (left) and Tryptophan (right) sensors.
Large-volume virus water sample filtration and collection system
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.
A USGS scientist collecting a discrete water-quality sample.
Little Muskego Lake sediment core mounted on sediment extrusion device
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.
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.
Lake sediment slice Lake Mendota
0.50 cm section of lake sediment from Lake Mendota, WI.
0.50 cm section of lake sediment from Lake Mendota, WI.
A custom automated pathogen sampler and schematic illustration.
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.
Scientist collecting sediment core from Little Menomonee River, WI
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
Surface water sampling for microplastics in Lake Michigan near Milwaukee, WI.
Surface water sampling for microplastics in Lake Michigan near Milwaukee, WI.
Custom-designed net for sampling microplastics at depth, Lake Michigan
Custom-designed net for sampling microplastics at depth, Lake Michigan.
Custom-designed net for sampling microplastics at depth, Lake Michigan.