Des Plaines River watershed

Des Plaines River watershed
Name	Des Plaines River watershed
Country	United States
State	Illinois
Basin size	~1,900 sq mi

Des Plaines River watershed The Des Plaines River watershed is a major drainage basin in northeastern Illinois that channels surface water through a network of rivers, streams, lakes, reservoirs, and wetlands toward the Illinois River and ultimately the Mississippi River. The watershed spans portions of Cook County, Lake County, Will County, Kane County, and McHenry County, and interacts with urban, suburban, agricultural, and protected landscapes near Chicago. Its hydrology, history, and management have influenced infrastructure projects linked to entities such as the Metropolitan Water Reclamation District of Greater Chicago, the United States Army Corps of Engineers, and the Illinois Environmental Protection Agency.

Overview

The watershed encompasses approximately 1,800–2,000 square miles and includes headwaters near Lena, Illinois and outlets that connect to the Chicago Sanitary and Ship Canal, the Illinois Waterway, and the Mississippi River Basin. Populated municipalities including Wheeling, Des Plaines, Schaumburg, Elgin, Joliet, and Park Forest lie within its extent, while transport corridors such as Interstate 90, Interstate 55, U.S. Route 12, and the Union Pacific Railroad traverse its floodplain. Management responsibilities involve state and federal actors like the Illinois Department of Natural Resources and regional organizations such as the Chicago Metropolitan Agency for Planning.

Geography and hydrology

Topography in the basin ranges from glacial till uplands to low-gradient alluvial plains left by the Wisconsin Glaciation and shaped by ice-marginal lakes including relics of Lake Chicago. The watershed's flow regime is influenced by precipitation patterns tied to regional storm systems and seasonal snowmelt, affecting discharge at gauging stations operated by the United States Geological Survey. Important hydraulic structures include remnants of the Chicago Sanitary and Ship Canal diversion, the O'Hare International Airport stormwater network, and flood-control works by the USACE Chicago District. Groundwater-surface water interactions draw on aquifers managed under statutes administered by the Illinois State Water Survey and impacted by legacy contamination sites listed by the Environmental Protection Agency.

Tributaries and lakes

Principal tributaries include the North Branch and South Branch of the Des Plaines River, the Kishwaukee River-proximate systems, the Salt Creek drainage, and smaller creeks such as Busse Brook, Hickory Creek, and Bull Creek. Significant lakes and impoundments within or adjacent to the basin include Lake Michigan-connected basins near northwest Indiana borders, artificial reservoirs like McDonald Lake, recreational lakes in Cook County Forest Preserves, and wetland complexes in the Morton Arboretum area. Canal connections include the Chicago Sanitary and Ship Canal and feeder channels serving industrial centers such as Gary and Calumet Harbor.

History and human impact

Indigenous presence prior to Euro-American settlement included groups associated with the Potawatomi, Miami, and Illiniwek confederations, with archaeological sites linked to Mississippian culture-era trade. European exploration involved figures connected to the French colonial empire and trade routes between Fort Dearborn and inland posts. Nineteenth- and twentieth-century development accelerated with railroads such as the Chicago and North Western Transportation Company, canal projects tied to George Pullman-era industrialization, and urban expansion by Chicago. Industrialization produced impacts from manufacturing centers like Joliet Steel Works and energy plants such as the former Dynegy facilities; public works initiatives by the Civilian Conservation Corps and New Deal agencies reshaped floodplains. Regulatory responses include planning under the Flood Control Act of 1936 and water quality actions influenced by the Clean Water Act.

Ecology and biodiversity

Remnant prairies, riparian woodlands, and marshes in the basin support flora such as Sarepta searlsiae-type associations, native big bluestem stands, and wetland sedge communities surveyed by the Illinois Natural History Survey. Fauna include migratory birds on the Great Lakes flyway like sandhill cranes, breeding populations of wood ducks, amphibians documented in studies by the Field Museum, and fish assemblages including northern pike, largemouth bass, channel catfish, and invasive species such as common carp and Asian carp. Conservation concerns address habitat fragmentation from suburbanization in places like Naperville and pollutant loadings traced to legacy industrial sites documented by the Illinois Environmental Protection Agency.

Flood control and water management

Flood mitigation relies on an integrated system of levees, detention basins, and channel modifications by the United States Army Corps of Engineers and local flood control districts such as the DuPage County Stormwater Management Commission. Major projects include retention basins in the Fox River-adjacent uplands, the Des Plaines River Valley Bridge impacts on hydraulics, and coordinated forecasting from the National Weather Service Chicago Office. Urban stormwater controls in municipalities like Arlington Heights and Bolingbrook use best management practices promoted by the Metropolitan Water Reclamation District of Greater Chicago and funding mechanisms through the Illinois Environmental Protection Agency grants.

Recreation and conservation efforts

Recreation opportunities span boating on navigable reaches near River Forest, canoeing in protected corridors managed by the Forest Preserve District of Cook County, angling hotspots near McHenry County Conservation District properties, and trail networks such as the Des Plaines River Trail connecting parks like Tower Lakes and Willow Springs. Conservation organizations active in the basin include the Openlands, the Sierra Club Chicago Chapter, the Nature Conservancy Illinois Chapter, and local watershed alliances partnering with institutions like the Morton Arboretum and the Chicago Botanic Garden. Restoration projects target invasive plant removal, streambank stabilization funded by the Great Lakes Restoration Initiative, and community science programs coordinated with universities including Northwestern University and the University of Illinois Urbana-Champaign.

Category:Rivers of Illinois