Reopening Fox lock triggers debate
on invasive species
Fishermen fear game fish may be compromised
By Paul Brinkmann
Green Bay Press Gazette
Published September 5, 2005
The hungry sea lamprey, with a mouth like a vampire on
steroids, is found almost everywhere in the Great Lakes
and its tributaries.
But it’s not found in Lake Winnebago, and not in the
upper reaches of the lower Fox River. And people want
it to stay that way.
That’s why a proposal to reopen the Fox River locks system
between Lake Winnebago and Green Bay to boat traffic leaves
closed the Rapid Croche lock and dam near Wrightstown.
The edge of the dam has a lip on it to keep out the lamprey.
It also keeps out a growing number of nasty critters that,
like the lamprey, are considered invasive species in the
Great Lakes — the spiny water flea, the round goby, the
ruffe fish and the white perch.
Some of those creatures are carried by boaters to new
territories. The issue of invasive species has prompted
a sharp division between fishermen who value Lake Winnebago
the way it is, and other boaters seeking more travel options
up and down the lower Fox River.
At least three fishing clubs around Lake Winnebago are
opposed to the idea of reopening 13 other locks so boats
can travel from Green Bay to Menasha and beyond.
“We’re very concerned about exotic species like the lamprey
getting in,” said Bill McAloon of Oshkosh, a member of
the Otter Street Fishing Club. “It’s kind of a touchy
subject with fishermen here.”
Keeping out the lamprey means a mechanism is needed to
lift boats over Rapid Croche. The private group Friends
of the Fox has a draft proposal that envisions a 20-minute
delay for boaters while their vessel and equipment are
inspected, lifted, power washed with hot water and, possibly,
cleaned with vinegar to kill any unwanted passengers.
The boatlift proposal has the blessing of Phil Moy, a
biologist with the University of Wisconsin SeaGrant Institute.
Moy is considered a leading expert on the zebra mussel,
an invasive species already at home in Lake Winnebago,
most likely because of unsuspecting boaters. He said the
boatlift at Rapid Croche might actually help prevent further
spread of the lamprey and its invasive cohorts.
“I’m pretty confident the system they’re going to propose
will prevent the spread through the boatlift. I think
the real threat is the access by trailered boats,” Moy
said. “It’s as foolproof as you’re going to get.”
That assurance is not enough for McAloon and other fishermen.
He said the Friends of the Fox group is playing with fire
by increasing boat traffic up the Fox River.
Friends of the Fox estimates up to 50,000 boats may use
the river system once it is reopened for boating between
Green Bay and Menasha. The stakes are high on all sides.
Lake Winnebago is not only unique for it’s lack of lamprey,
it’s also one of the last major refuges for the threatened
lake sturgeon, which are particularly vulnerable to lamprey
and other invasive species because they reproduce slowly.
The plan for the boatlift will be scrutinized in public
meetings to be scheduled sometime this fall, and by the
state Department of Natural Resources and possibly the
Sea Lamprey Control Program of the Great Lakes Fisheries
The Friends of the Fox group believes new boat traffic
will boost the local economy, especially in Appleton and
Neenah-Menasha. But some local fishing experts point out
that Lake Winnebago already is home to a thriving sport-fishing
“The last study I heard of said the fishing industry
here is worth $400 million to the local economy,” said
Ron Bruch, a DNR expert on the lake sturgeon. “My take
on it is, the sport fishermen and many people managing
the ecosystem are opposed to it (the plan to restart river
traffic), because even with a sophisticated decontamination
system, even if there’s limited failure, the impact can