Upper Tahquamenon Falls in Fall Color. Tahquamenon Falls State Park encompasses close to 50,000 acres stretching over 13 miles. Most of this is undeveloped woodland without roads, buildings or power lines. The centerpiece of the park, and the very reason for its existence, is the Tahquamenon River with its waterfalls. The Upper Falls is one the largest waterfalls east of the Mississippi. It has a drop of nearly 50 feet and is more than 200 feet across. A maximum flow of more than 50,000 gallons of water per second has been recorded cascading over these falls. Four miles downstream is the Lower Falls, a series of five smaller falls cascading around an island.