Upper Midwest Water Science Center

MC-ICP-MS used for mercury stable isotope analyses.

Graduate student, Grace Armstrong, performing mercury uptake studies in plankton at Mercury Research Laboratory, Middleton, Wisconsin.

The left axis is a visualization of an ensemble of solutions (crosses and dashed lines) iteratively moving down gradient on an objective function surface (color flood) in 2-D parameters space, with the associated prior (gray) and posterior (blue) parameter marginal distributions shown on the two right stacked axes.

A USGS hydrologic technician finishes installation of a rapid-deployment streamgage at Gordonville Road on the Tittabawassee River in Midland, Michigan. A USGS crew in the distance makes streamflow measurements using a boat-mounted acoustic Doppler current profiler. The USGS responded to major flooding at some locations in lower

This image shows a GLRI nutrient sampler submerged during major flooding on the Rifle River, Michigan, in May 2020. This site is near the Rifle River Near Sterling USGS streamgage.

Map of Green Lake, Wisconsin, and its watershed, with sampling data.

A hypothetical configuration of one of the two drained field sites, including a weather station for measuring climate data, a piezometer network for continuous water level measurements, soil moisture probes, and subsurface drainage flow. The third undrained field site will have a similar configuration, with the absence of subsurface drainage flow.

Durand streamgage mounted to bridge - looking downstream.

Map of dissolved oxygen and turbidity along the Milwaukee River.

These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science.

Sediment core sample taken at Grubers Grove Bay on the Wisconsin River, Wisconsin.

View from Durand bridge of boat crew conducting multibeam surveys