U. S. Geological Survey

Water Resources of Michigan

Comparison of Hydrologic Data from Monroe County, Michigan, 1991-2001

US Geological Survey Open File Report 01-498
Lansing, Michigan 2001

By: J.R. Nicholas, S. P. Blumer, and R.M. McGowan

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During the past decade, ground-water levels have declined in bedrocks aquifers throughout most of Monroe County. The declines are greatest in the northwestern townships. From 1991 to 2001, ground-water levels declined 10 feet or more in 17 USGS observation wells. The water level in one well declined 80 feet.

Available hydrologic data that can indicate trends in climate are Lake Erie levels, precipitation at Monroe, and River Raisin streamflow. None of these data show a trend during the past decade.Ground-water use has increased substantially in Monroe County during the past decade.

The largest use is quarry dewatering operations. The amount of ground-water withdrawn by quarries has doubled during the past decade and is about 75 percent of the total ground-water use in the County.


Nicholas, J.R., Blumer, S. P., and McGowan, R.M., 2001, Comparison of Hydrologic Data from Monroe County, Michigan, 1991-2001, U.S. Geological Survey Open-File Report 01-498.

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