Date: August 24, 2023 at 10:08:04 AM EDT
To: AlgaeBloom <>
Cc:, Lonnie Smith <>, Vanessa Nelson <>, Duane Schneider <>, Adam Byrne <>

Subject: RE: Suspicious Algae

Good Morning All,

MMDHD staff member conducted a site visit to Rainbow Lake, August 22nd to investigate the report of a harmful algal bloom.  After investigation it was determined that the issue observed was duck weed.  No sampling or testing was conducted at this time. Below is a link to the Harmful Algal Bloom Picture Guide for your reference and the State of Michigan’s Harmful Algal Bloom tool page.  At this time this department considers the issue to closed.

Michigan Harmful Algal Bloom Picture Guide

New tool available to track harmful algal bloom reports (

If you have any questions please feel free to contact me by either phone or email.


Bryan Fowler, REHS,RS

Environmental Health Supervisor

Mid-Michigan District Health Department