The Big Blue River is a scenic 57-mile waterway originating in Washington County, Indiana. It flows generally southward, forming portions of the boundaries between Harrison, Crawford and Floyd counties before emptying into the Ohio River near Leavenworth. The river carves through the limestone landscape of southern Indiana, creating a picturesque valley flanked by wooded bluffs and rocky outcroppings.

Paddlers can enjoy several distinct sections on the Big Blue, ranging from calm flatwater to more challenging Class I-II rapids. The most popular run is the 8-10 mile stretch from Rothrock Mill to Blue River Chapel, featuring a mix of small shoals and placid pools. More experienced kayakers often continue another 15 miles downstream to the Iron Bridge access point, encountering additional Class II rapids along the way.

The river is typically suitable for paddling from spring through fall, with optimal water levels usually occurring April through June. Late summer can bring low water conditions requiring more maneuvering around exposed rocks. The Big Blue's water quality is generally good, with a slightly stained appearance at normal levels that adds to its allure.

Wildlife enthusiasts may spot great blue herons, bald eagles, and river otters along the densely forested banks. The river valley provides habitat for diverse plant species, including sycamores, tulip poplars, and rare wildflowers in spring.

Key landmarks include the ruins of historic Rothrock's Mill, limestone bluffs, small caves, and natural springs feeding into the main channel. Access points are available in Milltown, at Rothrock Mill Road, Blue River Chapel, and near the confluence with the Ohio River.

The Big Blue played a significant role in early settlement and commerce of the region, powering grist mills and providing transportation. Today, it offers a tranquil escape into nature, with opportunities for fishing, wildlife viewing, and multi-day paddling adventures. Outfitters in Milltown provide canoe and kayak rentals, as well as shuttle services for those planning overnight trips.

Paddlers should be aware of occasional strainers and should exercise caution around the small dam remnants near Milltown. Life jackets are required, and checking water levels before embarking is advisable. With proper preparation, the Big Blue River provides an enchanting paddling experience through the heart of southern Indiana's picturesque hill country.