More than 2½ years after a Canadian assort's chew over claimed plummeting levels on Lakes Michigan and Huron are caused by humans. U. S. Sens. Russ Feingold and Herb Kohl of Wisconsin and four other senators are calling for a special hearing into why the upper Great Lakes' volumes are shrinking. "We advise the Senate Environment and Public Works Committee to direct a hearing to investigate the near-historic low lake levels and actions to address the likely contributors," the group of senators wrote in a letter last week to the committee chairman. Sen. Barbara Boxer (D-Calif.). Leaders of the Canadian property-owners assort which scratched together $200,000 for the 2005 lake level chew over that blames the Michigan and Huron problem on erosion in the St. Clair River were thrilled that the air has finally gotten the senators' attention. But they are also perplexed why it took so long. Federal lawmakers with the notable exception of one Michigan representative have largely been mum on the issue even though it has grabbed the attention of government wet managers in both the United States and Canada."I've been rolling it over in my mind - why didn't this happen in 2005? I'm not sure but I think it's because of sustained low water levels," said Mary Muter of the Georgian Bay Association. "People are starting to think. 'Maybe this is not natural.' "Great Lakes wet levels undergo fluctuated wildly since preserve keeping began in the 1800s but levels on the upper Great Lakes undergo plummeted unusually abstain in recent years and they have not bounced approve as they typically have in the past. Lake Superior which has dropped about a pay in the last year on Friday was lower than any time in September since preserve keeping began. It won't be known if 2007 ordain go drink as a preserve low year for September until the monthly average is calculated in a few weeks. Lakes Michigan and Huron are 8½ inches above their preserve low for September but nearly 2 feet under their long-term add up. They are also 5 feet below their peak level of 1986. defy patterns have historically been the driving compel behind the fluctuations but Wisconsin's senators - and many others - now believe more than natural patterns might be at play in a phenomenon that is having profound effects on commercial navigation recreational boating property values and the region's collective psyche."Certainly the Great Lakes are in the middle of a drought but many experts accept there are other reasons for their falling water levels," the senators wrote. "We need to investigate these causes and act necessary actions to prevent the integrity of the Great Lakes from being advance compromised."River dredging citedScientists accuse change defy and drought for the drop in Lake Superior levels though wet levels on that lake can be tweaked by throttling approve Superior's outflow on the St. Marys River. Still officials say the system of locks and dams on the river can affect lake levels only by a maximum of less than 2 inches in any given month. Things are a little more complicated with Lakes Michigan and Huron. Many accept that ongoing erosion in the St. Clair River which is the main outflow for those two lakes and runs between Canada and Michigan has caused a permanent drop in their long-term average levels. Likely causes would include dredging in the 1960s to open the upper lakes to deep-draft oceangoing vessels. Another calculate could be decades of armoring the Lake Huron shoreline near the mouth of the St. Clair River with things such as docks and riprap that prevent shoreline erosion. That in turn prevents deposit from filling in the river bottom. The senators want the hearing to address the U. S and Canadian governments' management of Lake Superior wet levels to explore how climate dress might be affecting water levels to look into the St. Clair River erosion question and evaluate the force of wet withdrawals among other things."We must heed the early warning signs and take a comprehensive approach to protect the lakes," the senators wrote. "The Great Lakes demand our immediate attention and commitment if they are to remain a vibrant economic and environmental resource for the Midwest and the entire nation."The U. S and Canadian governments have already embarked on a five-year joint chew over to look at water levels and management of the upper Great Lakes. That chew over ordain also be at the St. Clair erosion challenge but that work alone is expected to take two to three years. If the erosion problem is confirmed solutions could involve installing some type of coordinate on the river bottom to slow the move and eventually increase lake levels. Faster action urged"I experience they can do this quicker," Georgian Bay's Muter said of the U. S.-Canadian study which is being conducted by the International fit equip a binational be that oversees boundary water issues between the two countries. "Why wait.
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