Menasha, WI – The future of the Menasha Lock, closed since 2015 to block invasive round gobies, now hinges on a new scientific study. Researchers from the University of Wisconsin‑Green Bay are sampling the Winnebago water system to gauge the size of the goby population.

Study findings could trigger lock reopening

“If we find a significant goby presence in Lake Winnebago and its tributaries, it will spark a robust discussion about reopening the lock,” said Fox River Navigational System Authority (FRNSA) Executive Director Phil Ramlet.

Conversely, a low goby count would likely keep the lock closed, preserving the current barrier.

Why the lock was closed

The lock was shut down 11 years ago to prevent round gobies—an invasive fish that threatens native species—from spreading into the lake. Recent sightings near Oshkosh have prompted the DNR to reassess the situation.

“If a significant goby population is confirmed, there’s no need to keep the lock closed,” explained Angelo Cozzola, a DNR fisheries biologist.

Impact on local boaters

While the lock remains closed, boaters must drive to an alternate launch to travel between the Fox River and Lake Winnebago, adding time and inconvenience to recreational outings.

Round gobies and the ecosystem

Round gobies are an invasive species that can disrupt native fish populations. Though they coexist with other fish in the Great Lakes, the DNR worries that Winnebago’s unique habitat could suffer.

“The goby situation is unique, especially given the distinct sturgeon fishery in Lake Winnebago,” Ramlet noted, underscoring the need for careful evaluation.

Timeline

The study is slated for three years, but officials say a decision on the lock could come sooner if the data are clear.

Community members and anglers are watching closely, hoping the research will balance ecological protection with restored navigation access.

Original reporting: FOX 11 WLUK Green Bay (local) — read the source article.