Click on the image to access online locational data for reported algal blooms.

The Harmful Algal Bloom (HAB) mapping viewer identifies locations where HABs are voluntarily reported. The map is maintained by the HAB Response Team, which is made up of staff from Missouri's Department of Natural Resources, Department of Conservation, Department of Health and Senior Services and Department of Agriculture. Submitted reports may include suspected bloom locations that are later verified as not a bloom. Updates based on investigations are noted on the map. 

How to Use the Map

Colored dots on the map represent the reported bloom location. The color and symbol used are based on the current bloom status and the date since the report was last verified by staff. Please refer to the map legends for details.

When a specific dot is selected, a pop-up window with additional details is provided for that report. Updates for a location are added to this map when provided. When updates are not shared with the HAB Response Team, the location's dot symbol will fade in color after two weeks since the last update. Please refer to the map legends for details.

Disclaimer: Please use data presented in this map for general purposes only. The exact location, extent and toxicity of the reported bloom may not be accurate due to changing environmental conditions. Reported blooms can be localized to part of a waterbody (specific shorelines or confined coves), move with the water current or impact the entire waterbody (lake-wide). The data are subject to change as new information is received. If a HAB location is missing from this map, please notify the HAB Response Team through the Harmful Algal Bloom Reporting Form.

Guidance for Recreational Notifications and Advisories

The HAB Response Team coordinates responses to reports with other state and local agencies. The HAB Response Team may conduct follow-up field investigations or water testing to advise recommendations provided to the waterbody manager. The waterbody manager is ultimately responsible for posting and maintaining notifications. 

What You Can Do

Practicing healthy water habits while outdoors is recommended even for waterbodies with no information noted on the map. If you believe you have seen or are dealing with a HAB, please report the bloom. If you or your animals encountered a HAB and are experiencing symptoms, seek medical attention. To learn more about identifying HABs, visit Cyanobacteria – Harmful Algal Blooms, Blue-Green Algae.

When in doubt, report and stay out!