The Blue River is a 57-mile-long (92 km),[2][3] two-forked stream that runs through Harrison, Crawford and Washington counties in Indiana.

The Blue River is known for its scenery and is one of the main destinations in Southern Indiana for canoeing and kayaking.

The main river starts its 57.15 mile journey to the Ohio at the confluence of its two forks in Fredericksburg.

From Fredericksburg the river heads south, meandering from farmland into increasingly wooded areas surrounded by large bluffs.

A small dam at the site of Rothrock's Mill requires portage from travelers, but it is the last obstruction on the river.

[8] Many birds, including ducks, geese, bald eagles, and cranes are also frequently seen near the river.

In pre-Columbian times, Native Americans mined the blueish-gray chert and flint in the Ohio Valley for arrowheads, spearheads, and other weapons and tools.

Water mills were built along the Blue River to supply demand from local farms.

As watermills in the United States went into decline after the arrival of electricity, so did many of the towns alongside the river.