The area is extremely flat and the course and even the direction of the river system has changed repeatedly. The low gradient gives the river only a very small current. Before human alteration, water flowed westward from LaPorte County, Indiana along the Little Calumet River, made a complete turn, and flowed east along the Grand Calumet into Lake Michigan in the Miller neighborhood of Gary, Indiana.
Industrial development in the Calumet River area began around the 1870s, and by 1890 the West reach of the Grand Calumet River was heavily polluted with the waste of steel mills, foundries, a meat packing plant, and glue and cornstarch factories. Industry continued to spread along the East reach of the river between 1890 and 1910, with similar results. These decades of unrestricted pollution have left the river sediments highly contaminated to this day.
In September 2008, areas of Lake and Porter County, Indiana, were declared national disaster areas. The Calumet River breached its levee and flooded portions of the towns of Munster and Highland, Indiana.
Segments of the Calumet River system 
Calumet River 
The Calumet River, on the south side of Chicago, originally simply drained Lake Calumet to Lake Michigan. A canal extending it, legendarily claimed to have been created by voyageurs at the site of a frequent portage, was dug connecting the two Calumet Rivers at the point where the name now changes from Grand to Little.
Grand Calumet River 
The Grand Calumet River, originating in the east end of Gary, Indiana, flows 16.0 miles (25.7 km) through the cities of Gary, East Chicago and Hammond, as well as Calumet City and Burnham on the Illinois side. The majority of the river's flow drains into Lake Michigan via the Indiana Harbor and Ship Canal, sending about 1,500 cubic feet (42 m3) per second of water into the lake. Today, a large portion of the river's flow originates as municipal and industrial effluent, cooling and process water and storm water overflows. Although discharges have been reduced, a number of contaminants continue to impair the area.
Little Calumet River 
The Little Calumet River originally flowed in New Durham Township, LaPorte County, Indiana to its junction with the Grand Calumet and Calumet rivers, but construction of the Burns Waterway in 1926 effectively cut the Little Calumet River into a west and an east arm. The west arm is now known as the Little Calumet River proper, and it flows through or borders the towns of Portage, Lake Station, Gary, Highland, Griffith, Munster, and Hammond, then through South Holland, Dolton, Lansing, Calumet City, Harvey, Riverdale, Phoenix, Dixmoor, Burnham, and Blue Island in Illinois, connecting at the junction of the Grand Calumet River and Calumet River. This arm of the river is 41 miles (66 km) long. Its flow has been divided by the Burns Waterway since 1926 with the portion east of Hart Ditch in Munster flowing east to the Burns Waterway and out to Lake Michigan, and the portion west of Hart Ditch in Munster flowing west to the Calumet River and Cal-Sag Canal. The Little Calumet has 109 miles (175 km) of river and tributaries and drains 213 square miles (550 km2).
The East Arm Little Calumet River begins just east of Holmesville in New Durham Township, LaPorte County, Indiana, and also flows through Chesterton, Porter, and Burns Harbor where it connects to the Port of Indiana-Burns Waterway. It has a total length of 22 miles (35 km). It used to continue westward to Illinois as the Little Calumet River, but construction of the Burns Waterway in 1926 diverted its flow into Lake Michigan.
Up until sometime in the late 1940s or early 1950s, the Little Calumet River was heavily polluted with sewage and the only fish living in the river were carp. During heavy spring rains, the river would often flood areas adjacent to the river.
The Little Calumet River has been undergoing construction of a $200 million flood control and recreation project by the Chicago District of the U.S. Army Corps of Engineers since 1990. The project is expected to be complete in 2013. The project includes construction of 22 miles (35 km) of levees and floodwalls, a control structure at Hart Ditch, and almost 17 miles (27 km) of hiking trails. Additionally, seven miles (11 km) of the river channel is being relocated to allow better water flow, and highway bridges are being modified to permit unobstructed flow of water. A flood warning system is also being implemented. When complete, the project will protect over 9,500 homes and businesses in the towns of Gary, Griffith, Hammond, and Munster in Indiana, and prevent nearly $11 million in flood damage annually. On September 15, 2008, the remnants of Hurricane Ike released heavy rain which flooded the banks of the Little Calumet River. Houses and strip malls in northern Munster and southern Hammond were evacuated. Hundreds of homes were damaged due to flooding. Recently, a new levee, along Northcote Ave in Munster, is being built to protect residents from future floods.
Cal-Sag Channel 
The Cal-Sag Channel (short for "Calumet-Saganashkee Channel") is a navigation canal in southern Cook County, Illinois. It serves as a channel between the Little Calumet River and the Chicago Sanitary and Ship Canal. It is 16 miles (26 km) long and was dug over an 11-year period, from 1911 until 1922.
The Cal-Sag Channel serves barge traffic in what was an active zone of heavy industry in the far southern neighborhoods of the city of Chicago and adjacent suburbs. As of 2006 it is also used more as a conduit for wastewater from southern Cook County, including the Chicago-area Deep Tunnel Project, into the Illinois Waterway. It is also used by pleasure crafts in the summer time.
The western 4.5 miles (7.3 km) of the channel flow through the Palos Hills Forest Preserves, a large area of parkland operated by the Forest Preserve District of Cook County.
The Calumet-Sag Trail, a 26-miles-long (41 km) greenway, will border the channel and will stretch from the Chicago Sanitary and Ship Canal to the Burnham Greenway when it is completed.
Pollution in the Grand Calumet 
Suffering from over a century of environmental neglect, The Grand Calumet River is highly polluted. Historically, the Grand Calumet River supported highly diverse, globally unique fish and wildlife communities. Today, remnants of this diversity are found in the Gibson Woods and Pine nature preserves. These areas contain tracks of dune and swale topography and associated rare plant and animals species, such as Franklin's ground squirrel, Blanding's turtle, the glass lizard and the Black-crowned Night Heron, among others. The problems mentioned above, however, have greatly impaired the river. It has been listed as one of the 43 Great Lakes Areas of Concern (AoC) since 1986. AoC's are designated by having an impairment in at least one of fourteen beneficial uses. The Grand Calumet is the only AoC to be impaired on all fourteen. These impairments include total fish consumption restrictions, beach closings, fish tumors or deformities, animal deformities or reproductive problems, and loss or degradation of fish and wildlife habitat, benthos, phytoplankton, and zooplankton populations, among others.
The National Bureau of Standards and Technology (formerly the National Bureau of Statistical Standards) at one time would scoop up the canal bottom muck, dry it out, and sell it as a testing powder for spectrometer testing, because the contaminated sludge has the widest number of chemical compositions most evenly distributed throughout the canal bottom of any polluted site in the United States.
The largest extent of the river's impairment comes from the historical sediment contamination by the industrial activities already mentioned. Today, sediments on the river bottom are "among the most contaminated and toxic that have ever been reported." Only sludge worms inhabit the Indiana Harbor and Ship Canal, indicating that severe pollution exists. The Grand Calumet suffers from contamination from polychlorinated biphenyls (PCBs), polynuclear aromatic hydrocarbons (PAHs). and heavy metals, such as mercury, cadmium, chromium and lead. Additional problems include high fecal coliform bacteria levels, biochemical oxygen demand (BOD) and suspended solids, oil and grease. These contaminants originate from both point and nonpoint sources.
Nonpoint sources 
- Contaminated sediment: The Grand Calumet River and Indiana Harbor and Canal contain 5 to 10 million cubic yards (3.9 to 7.7 million m³) of contaminated sediment up to 20 feet (6 m) deep. Contaminants include toxic compounds (e.g., PAHs, PCBs and heavy metals) and conventional pollutants (e.g., phosphorus, nitrogen, iron, magnesium, volatile solids, oil and grease).
- Industrial waste site runoff: Stormwater runoff and leachate from 11 of 38 waste disposal and storage sites in the AoC, located within 0.2 miles (300 m) of the river, are degrading the water quality. Contaminants include oil, heavy metals, arsenic, PCBs, PAHs and lead.
- Superfund sites: There are 52 sites in the AoC listed in the federal Comprehensive Environmental Response Compensation and Liability Act (CERCLA) System, more commonly known as Superfund. Five of these sites are on the National Priorities List.
- Hazardous waste sites under RCRA: There are 423 hazardous waste sites in the AoC regulated under the Resource Conservation and Recovery Act (RCRA), such as landfills or surface impoundments, where hazardous waste is disposed. Twenty-two of these sites are treatment, storage and disposal facilities.
- Underground storage tanks (USTs): There are more than 460 underground storage tanks in the AoC. More than 150 leaking tank reports have been filed for the Lake County section of the AoC since mid-1987.
- Atmospheric deposition: Atmospheric deposition of toxic substances from fossil fuel burning, waste incineration and evaporation enter the AoC through direct contact with water, surface water runoff and leaching of accumulated materials deposited on land. Toxins from this source include dioxins, PCBs, insecticides and heavy metals.
- Urban runoff: Rain water passing over paved urban areas washes grease, oil and toxic organics such as PCBs and PAHs into the surface waters.
- Contaminated groundwater: Groundwater contaminated with organic compounds, heavy metals and petroleum products contaminates surface waters. The U.S. Environmental Protection Agency estimates that at least 16.8 million US gallons (64,000 m³) of oil float on top of groundwater beneath the AoC.
Point sources of contaminants 
- Industrial and Municipal Wastewater Discharges: Three steel manufacturers contribute 90 percent of industrial point source discharges to river. One chemical manufacturer also discharges into the river. Permitted discharges include arsenic, cadmium, cyanide, copper, chromium, lead and mercury. Three municipal treatment works (Gary, Hammond and East Chicago Sanitary Districts) discharge treated domestic and industrial wastewater.
- Combined Sewer Overflows (CSOs): Fifteen CSOs contribute untreated municipal waste, including conventional and toxic pollutants, to the river. Annually, CSO outfalls discharge an estimated 11 billion US gallons (42,000,000 m³) of raw wastewater into the harbor and river. Approximately 57% of the annual CSO volume is discharged within eight miles (13 km) of Lake Michigan, resulting in nearshore fecal coliform contamination.
See also 
- Project Management Plan
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 19, 2011
- State of Indiana Coastal Nonpoint Pollution Control Program Environmental Assessment (Report). National Oceanic and Atmospheric Administration. 2007-09. p. 13. http://coastalmanagement.noaa.gov/assessments/docs/IndianaFinalCNPEA.pdf. Retrieved 2011-05-02.
- U.S. Geological Survey Geographic Names Information System: Little Calumet River
- Our Community & Flooding - Federal Programs
- U.S. Geological Survey Geographic Names Information System: East Arm Little Calumet River
- USACE Chicago Dist - Little Calumet River Home
- Lyke, Bill (29 August 1959). "Drive Out to the Pan-Am Gamnes!". Chicago Tribune. pp. B1. Retrieved 14 August 2009.
- SpringerLink - Journal Article
- Warning: Grand Cal fish dangerous; Post-Tribune Staff Report; Gary, Indiana; June 30, 2010
External sources 
- US EPA Area of Concern
- Prairie Rivers Network
- TopoQuest, Cal Sag and Little Calumet
- Encyclopedia of Chicago - Calumet River System