Map of HAB's Reports
This map displays harmful algal bloom reports made by the public and any subsequent advisories recommended by the State HAB Program and local jurisdiction. HABs are increasingly common across Montana, and their presence and potential toxicity can change very quickly. Therefore, this map does not show the full potential of waterbodies experiencing blooms, nor can we accurately know the health risk at any given time. Please use your best judgment to determine if a bloom is in the area, and if in doubt, stay out. If you observe a suspicious bloom, please feel free to submit a report to keep the system updated.