The money will come from the federal the Great Lakes Restoration fund and go toward projects in the Maumee River watershed and the Sandusky River watershed in northwestern Ohio.
The Ohio Environmental Protection Agency says much of the money will toward preventing phosphorus from getting into the lake and fueling the algae.
Some will be used to fund projects that will take cropland out of production, install field runoff retention systems and restore six miles of stream channels to their natural habitat.
The projects will also restore 70 acres of wetlands and wet prairies.