TRAVERSE CITY, Mich. (AP) — A U.S.-Canadian panel urged
both nations Friday to consider installing water retention structures to
boost levels on Lake Huron and Lake Michigan, which fell to their lowest
point on record in January and have lagged well below their historical
average since the late 1990s.
The International Joint Commission, which advises the two federal
governments about shared waterways, called for a study of placing
inflatable gates or other devices in the St. Clair River, the outlet at
the southern end of Lake Huron. Officials have acknowledged that dredging,
gravel mining and other human activities eroded the river bottom in the
last century, accelerating the volume that flowed out of Lake Huron toward
Owners of Huron shoreline property, particularly in Canada's Georgian Bay,
have demanded action for years to offset the losses, although federal
scientists say rising evaporation and declining rain and snow are the
biggest reasons for the lake's drop-off.
In a letter to the governments, the commission proposed investigating ways
to raise Huron and Michigan by 5 to 10 inches. Although considered two
separate lakes, they are connected by a 5-mile-wide strait and are the
same elevation above sea level.
"Although future water levels are uncertain, we cannot ignore the damage"
already done from record lows, said Joe Comuzzo, chairman of the Canadian
delegation to the commission.
Although not endorsing specific measures, the panel suggested focusing on
adjustable devices that could be activated during low-water periods when
outflow from Lake Huron needs to be reduced and deactivated when there's
danger that water could get too high.
The commission has six members, three from both countries, although one of
the Canadian positions is vacant. Four of them signed the report. Lana
Pollack, head of the U.S. delegation, declined to endorse it because she
said it might give "false hopes" that artificial structures could solve
the low-water problem.
While much of the document is praiseworthy, it understates the role
climate change has played and says too little about the need for
governments to help people adapt, she said.
"The public really needs to understand what we're doing to our Great Lakes
by pumping greenhouse gases into the atmosphere and creating climate
change," Pollack said in a telephone interview.
Great Lakes levels fluctuate seasonally and have risen and fallen
significantly over the decades, but now are in a prolonged low-water
period. Huron and Michigan have suffered the biggest drop-offs. When they
set a record in January, they were 29 inches below their long-term average
and had declined 17 inches within a year.
They have risen slightly since then, helped by heavy snowfall and rain.
But the U.S. Army Corps of Engineers says it would take a number of
unusually wet years to restore the lakes to normal.
Studies have shown that Huron and Michigan fell by 10 to 16 inches because
of dredging and other activities as late as the 1960s. Congress authorized
steps to slow the flow from Lake Huron and the corps produced options in
1972, including miniature dams and sills that resemble speed bumps along
the river bottom. But nothing was done because by then a three-decade-long
rising trend was underway.
Mary Muter, co-director of a group called Restore Our Water International,
said the commission's support for boosting levels was "excellent news." In
addition to placing artificial devices in the river, the governments
should spread rock rubble along the bottom to prevent further erosion, she
"If we can bring the levels back up a bit and then let them fluctuate
naturally, that's been our goal from day one," she said.
But another advocacy group, Georgian Bay Forever, said the proposal was
"limited and ineffective." It would not boost levels enough to help the
shipping industry, which has lightened cargo loads to avoid running
around, executive director David Sweetnam said.
"Add to this the impact on agriculture, tourism, water quality and a host
of other stakeholders, and the costs of inadequate action to the region's
$5.1 trillion economy may total many billions of dollars," he said.