Overview
- Routine plankton tow net samples detected zebra mussel veligers and follow-up sampling found adult mussels, leading to a state confirmation of infestation.
- The Game and Fish Department designated Horseshoe Lake as Class I aquatic nuisance species infested water and put emergency rules into effect to slow spread.
- The emergency rules ban moving water away from the lake, including water used to transfer live bait, and notices will be posted at lake access sites.
- All docks, boat lifts and related equipment taken from Horseshoe Lake must be left dry for at least 21 days before use in another water, and anglers face limits on bait transport during open water months.
- Officials say zebra mussels can quickly colonize surfaces, harm native species and clog intakes, so they urge the public to follow Clean‑Drain‑Dry steps and report sightings at gf.nd.gov/ans.