Invertebrate animal (without back bones) large enough to be observed without the aid of a microscope or other magnification.

Maximum Contaminant Level (MCL)

The designation given by the U.S. Environmental Protection Agency (EPA) to water-quality standards promulgated under the Safe Drinking Water Act. The MCL is the greatest amount of a contaminant that can be present in drinking water without causing a risk to human health.


A circuitous winding or bend in the river.


Maumee River Basin Commission