Ohio environmental officials will begin studying the Stillwater River watershed this year to monitor the quality of the river that passes through parts of Ohio and Indiana.
The state scenic river is part of the Great Miami River watershed. It flows 67 miles from its headwaters in Indiana and northern Darke County in western Ohio through Miami County to the Great Miami River in Dayton.
The Ohio Environmental Protection Agency says the study will determine or verify classifications for the area's significant streams. Those classifications indicate the quality of water and aquatic life and are used when deciding whether to permit projects that may lower water quality.
The watershed covers about 673 square miles, including about 32 square miles in Indiana. It is drained by 280 miles of streams.