Watersheds - Vermilion-Wabash Basin
USGS Cataloging Unit
The Vermilion watershed in eastern Illinois and western Indiana is part of the Wabash River basin. With drainage from five Illinois counties, the Illinois portion of the watershed has a total area of approximately 1,300 square miles. Agriculture is the primary use of land within the watershed. This watershed should not be confused with the Vermilion watershed in east-central Illinois, which is part of the Illinois River basin.