Assessing Cyanobacterial Harmful Algal Blooms (CHABs) in Lower Green Bay


Although HABs are common in Green Bay, assessments specific to HABs and associated toxins are more limited.A more robust assessment of the duration and extent of CHABS and associated toxins as well as the conditions associated with HAB formation is necessary to assess the status of the beach closings impairment for the AOC, to assess the risk to swimmers, and to inform other AOC impairment decisions.


Identify the extent, severity, toxicity, and temporal trends of HABs in Lower Green Bay 1.) Determine feasibility of using a beach health risk predictive tool (e.g. nowcast in Virtual Beach) for estimating recreational risk that can be implemented locally and provide daily assessments. 2.) Provide relevant supporting data necessary to develop HAB modelling tools for predicting HAB productivity and spatial patterns. 3.) Assess whether monitoring protocols used in this project are transferrable to HAB assessments and drinking water source protection activities in Lake Winnebago 4.) Develop a data set that can be used to inform decisions about anticipated recreational water standards (3 monitoring seasons) 5.) Develop management recommendations for managing CHAB recreational risk associated with restoring Bay Beach. 6.) Provide samples and supporting data for compatible research objectives of key collaborators at UW-Milwaukee, NOAA, and USGS a. Understand the genetic potential for cyanobacteria to produce toxins b. Better understand the dynamics and relationship between bloom formation and nutrients c. Provide data for ground-truthing remote sensing and NOAA’s forecasting efforts


Three years of algae, toxin, and related data that aid in understanding the dynamics of algae blooms in Lower Green Bay. Preliminary assessment of a predictive model that can be useful for understanding recreational risk in near real-time.

Study Design

Sample stations overlap existing NEW Water routine collection so weekly samples collected in deeper water. Two stations established in nearshore area by Bay Beach and along east shore of lower Green Bay where grabs will be collected more frequently. Three continuous buoys will be use - 2 deployed for project to look at both in location bloom formation and transport by wind, wave, current.

Related Reports

Run Project Summary Report
View Umbrella-Projects
View Related-Projects

Great Lakes Restoration Initiative
Toxics and Areas of Concern
Reports and Documents
Progress Report on modeling in Green Bay
Progress Report - UW Milwaukee Toxins and Buoy
Progress report for 07/01/2019 - 12/01/2019
2018 status - Oct - Dec.
2018 Report on season progress
Third quarter of 2018
Summary of activities for 2017 season
NEW Water's (Green Bay Metropolitan Sewerage District) quarterly report for 2017 third quarter for assessing cyanobacterial harmful algal blooms (CHABs) in the Lower Green Bay.