Illinois Waterway

Illinois Waterway
Name	Illinois Waterway
Source1 location	Chicago River at Chicago
Mouth location	Confluence with Mississippi River at Grafton, Illinois
Length mi	336

Illinois Waterway. The Illinois Waterway is a 336-mile-long engineered river system providing a vital navigable connection between the Great Lakes and the Mississippi River. It consists of the Chicago Sanitary and Ship Canal, the Des Plaines River, and the Illinois River, ultimately linking the metropolitan Chicago area to the Gulf of Mexico. This critical corridor is maintained by the United States Army Corps of Engineers and features a series of locks and dams to manage water levels and facilitate commercial barge traffic.

Geography and Course

The waterway originates at the confluence of the Chicago River and the Chicago Sanitary and Ship Canal near downtown Chicago. It proceeds southwest, incorporating the channelized Des Plaines River and passing through communities like Joliet and Romeoville. The system then merges with the natural course of the Illinois River near Morris, flowing past cities such as Peoria and Beardstown. Its final segment passes through Pere Marquette State Park before joining the Mississippi River at Grafton, Illinois, just north of St. Louis.

History and Construction

Early transportation on the region's rivers was championed by French explorers like Louis Jolliet and Jacques Marquette. The strategic vision for a direct lake-to-gulf connection drove the monumental construction of the Chicago Sanitary and Ship Canal, completed in 1900 by the Chicago Sanitary District. This project famously reversed the flow of the Chicago River to address sanitation issues and create a navigable passage. Further development continued throughout the early 20th century under the Rivers and Harbors Act, with the modern system largely completed by 1933, transforming the Illinois River into a controlled waterway.

Locks and Dams

The system is managed by eight operational lock and dam complexes to maintain a minimum nine-foot draft for navigation. Key structures include the Thomas J. O'Brien Lock and Dam near Lake Calumet and the Lockport Lock and Dam on the Des Plaines River. Downstream on the Illinois River, major facilities are the Starved Rock Lock and Dam, the Peoria Lock and Dam, and the La Grange Lock and Dam. The southernmost structure is the Melvin Price Locks and Dam on the Mississippi River, which marks the waterway's terminus.

Economic and Commercial Use

This corridor is a cornerstone of the United States inland waterway system, handling millions of tons of cargo annually. Major commodities include grain from the Midwestern United States, coal, petroleum products, chemicals, and manufactured goods. The waterway directly serves important industrial and agricultural centers like Joliet, Peoria, and the Cahokia area. It is a critical link in the Mississippi River System, enabling efficient transport between the Great Lakes via the Illinois River and ports on the Gulf of Mexico such as New Orleans.

Environmental Aspects

Water quality and ecosystem management are ongoing challenges coordinated by agencies like the United States Environmental Protection Agency and the Illinois Department of Natural Resources. Key concerns include controlling invasive species like Asian carp, which threaten the Great Lakes, and managing nutrient runoff affecting the Gulf of Mexico hypoxic zone. Projects under the Great Lakes Restoration Initiative and the Water Resources Development Act aim to address habitat restoration, water quality, and the ecological integrity of connected systems like the Des Plaines River and Illinois River floodplain.

Recreation and Tourism

The waterway and its adjacent lands offer extensive recreational opportunities managed by entities such as the National Park Service and the Illinois Department of Natural Resources. Popular activities include boating, fishing for species like catfish and bass, and birdwatching along the Illinois River Road National Scenic Byway. Significant attractions include Starved Rock State Park, the Meredosia National Wildlife Refuge, and the Mormon Pioneer National Heritage Area. Annual events like the Peoria Riverfront Festival and heritage sites such as the Lewis and Clark State Historic Site draw visitors to the region.

Category:Rivers of Illinois Category:Canals in Illinois Category:Transportation in Illinois