AP Environmental Writer
TRAVERSE CITY, Mich. (AP) — Water levels on Lakes Michigan and Huron barely
missed a record low in October, continuing a downward trend caused by
drought and evaporation, federal officials said Wednesday.
The U.S. Army Corps of Engineers, which tracks Great Lakes ups and downs,
recorded Michigan-Huron at 576.6 feet above sea level for October. That’s an
inch-and-a-half above the lowest point for that month since the agency began
keeping records in 1918, and about 6 inches above the all-time low recorded
in March 1964.
Michigan and Huron are considered one lake from a hydrological perspective
because they have the same surface level and are connected at their northern
ends by the 5-mile-wide Straits of Mackinac.
All the lakes were below their long-term averages for the month and lower
than a year ago because of an abnormal lack of snow last winter and the hot,
dry summer, said Keith Kompoltowicz, a hydrologist with the Army Corps
district office in Detroit. A wetter-than-usual October that included
Superstorm Sandy has made only a slight difference.
“We would need several months and several seasons in a row” of generous
rainfall and snowmelt to restore the lakes to their historical averages,
The storm probably raised the easternmost lakes — Erie and Ontario — and
perhaps gave a slight boost to Huron and Michigan, he said. But those gains
could be offset by the seasonal decline that takes place every fall and
winter. Levels tend to rise in spring and summer, fed by rain and melting
"There’s a constant battle between how much rain and runoff is coming into
the lakes versus how much is leaving through evaporation,” Kompoltowicz
said. “This time of year, evaporation usually wins out.”
Low levels have been a recurring concern on most of the Great Lakes since a
sudden drop-off in the late 1990s. They cut into cargo shippers’ profits by
forcing them to carry lighter loads. They cause shallow water in marinas,
dry up wetlands crucial for wildlife, and cause vegetation to grow on
Local officials along the coasts are pleading for stepped-up dredging in
shallow ports, but a tight budget limits what the Army Corps can do —
particularly for small harbors, said David Wright, operations chief for the
Despite recurring conspiracy theories about secret pipelines to the West or
stepped-up outflows from the Chicago River, officials say the declines have
been driven almost entirely by less rain and snowfall. Additionally, milder
winters have produced less ice cover, boosting evaporation.
The Army Corps is scheduled to release a six-month lake levels forecast
“If we were to see a very similar winter to what we had last year ... the
potential is very real for new record lows,” Kompoltowicz said.