Posted: 10/1/26

The DNR has reported the results of a sample taken at Lake Susan in Chanhassen confirming the presence of zebra mussel veligers (microscopic, free-floating larva). The sample was collected as part of increased monitoring on Lake Susan due to its downstream connection to Lake Ann, where zebra mussels were first discovered in 2023. 

The positive identification of two zebra mussel veligers came from one of two veliger tows performed on the lake on July 20, 2026. A veliger tow involves the steady pull of a fine-mesh zooplankton net from the bottom of a lake to the surface. No veligers were found in the sample collected by the second veliger tow. 

Lake Susan will now be added to the state’s Designated Infested Waters list for zebra mussels. 

Help Control the Spread of Zebra Mussels

Follow the Clean-Drain-Dry-Dispose method to ensure you aren’t inadvertently transporting invasive species like zebra mussels to other waterbodies. 

1. CLEAN off  visible aquatic plants, animals, and mud from all equipment before leaving water access.
2. DRAIN watercraft bilge, livewell, motor and other water containing devices before leaving water access.
3. DRY everything for at least five days OR wipe with a towel before reuse. 
4. DISPOSE of all unwanted bait in the trash.