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Through Meander, Forest and Flood

The marsh existed within the Kankakee River drainage basin's 5,165 square miles (13,380 km2). Its estimated size ranged between 400,000 acres (160,000 ha) to over 1 million acres (404,686 ha) across 1,600 square miles (4,100 km2), and its main tributary, the Kankakee, was over 240 miles (390 km) long with over 2,000 meander bends. Its flat elevation of 1.3 feet per mile (0.25 m/km) maintained the land wet most of the year.

The Kankakee Marsh was a mosaic of marsh, swamp, bog, fen, forest, prairie, wet meadow, oak savanna, and barren vegetation. Countless fish, reptiles, amphibians, insects, invertebrates, birds, and semi-aquatic mammals inhabited the marsh. Its habitats consisted of vast, open stretches of shallow water with island ridges, aquatic plants (e.g., cattails, wild rice), shrubs (e.g., willows, dogwoods), and trees (e.g., maples, oaks). Notable features included English Lake, formed by the confluence of the Kankakee and Yellow rivers, and Beaver Lake, the largest lake in Indiana until the 1880s. The marsh provided spawning grounds for fish from the Illinois River.

American settlers, syndicates, land speculators, and the Indiana General Assembly gradually destroyed the marsh between 1882 and 1917 by channelizing rivers and streams. The Kankakee River became one of the largest drainage ditches in the U.S. The draining of the marsh turned it into a major agricultural region, enabling its nine counties in 2022 to generate over $1.6 billion from crop revenues and over $847 million from livestock revenues.

The channelization of the Kankakee River has caused serious environmental issues over the last century, including floods and erosion. Siltation, suspended solids, nutrient pollution from farm runoff, and other issues have degraded water quality, requiring state and community partnerships to invest millions of dollars in soil and water conservation and stabilization programs. Extreme fluctuations in high and low flow water levels have degraded the environment and reduced wildlife habitat, causing significant biodiversity loss.

The destruction of the Grand Kankakee Marsh contributed to Indiana's total wetland losses of 87%. Its history exemplifies how Indigenous peoples were forcibly removed and ecosystems destroyed for development. The marsh's history of destruction is similar to that of Tulare Lake in California, and the Great Black Swamp in Indiana, Ohio, and Michigan. Scientific understanding about wetland ecology has grown since the 1970s, increasing public attention on the economic, environmental, and public health values of wetlands like the Grand Kankakee Marsh. This attention has contributed to important policies on wetland conservation (both American and international), natural resource management, wildlife conservation, and global efforts to prevent forced Indigenous removal, pollution, resource depletion, environmental degradation, ecocide, ecosystem collapse, and extinction caused by humans.

Natural history of the marsh

Geology and hydrology

The Grand Kankakee Marsh developed on the till plains and moraines left by the retreating Laurentide ice sheet in northern Indiana and northern Illinois following the Last Glacial Maximum 24,000 Years Before Present (or YBP). During the Late Wisconsin Episode's Woodfordian Substage (20,000–14,000 YBP), deposits of diamicton, limestone, shale, and dolomite fragments across the Kankakee till plains resulted in silt clay-loam to clay soils. The Kankakee River Basin's bedrock is primarily Silurian and Devonian. Freshwater flows through dolomite and limestone Silurian-Devonian aquifers within the Kankakee Arch.

The Kankakee Torrent (19,000 YBP) occurred when the ice sheet discharged large volumes of meltwater. This mega-flood deeply eroded earlier valley deposits of clay, silt, gravel, and sand, depositing thick outwash later reworked by wind, along with sand from the Valparaiso Moraine, into aeolian dunes. The torrent also redirected the Illinois River and formed Lake Chicago (14,000–11,000 YBP), which developed between the ice and the Valparaiso Moraine as the Lake Michigan ice lobe retreated.

Lake Kankakee developed within the Kankakee valley 14,000 YBP, likely consisting of a shallow lake or a series of wetlands. Its sand dune region covered 3,000 square miles (7,800 km2), with water levels reaching 40 feet (12 m) above the present-day Kankakee River.

Isosatic rebound caused the Earth's crust to uplift, draining the Great Lakes until 3,000 YBP. The natural draining of Lake Kankakee exposed a nearly flat bedrock surface covered by thin Pleistocene drift, with outwash sand and gravel prevailing over lacustrine deposits.

Peat formed in glacial lake basins, between sand dunes, and within ancient meander channels and kettles. Sand and gravel beds formed aquifers as modern soil developed 14,000–13,000 YBP.

The 8.2-kiloyear event, a rapid drop in global temperatures, induced two phases of wind-blown loess deposition across northern Indiana and northeast Ohio from 8,950 to 8,005 YBP. Loess was rich with freshwater fossil shells. Marl deposits consisted of shells from Physa, Planorbis, Unio, and other mollusk species. Drift levels vary by county, reaching depths of up to 38 feet (12 m). Blue glacial till existed 10–40 feet (3.0–12.2 m) below the sand.

The Kankakee Marsh's headwaters featured knob and kettle topography. Higher elevations contained organic-rich lacustrine deposits of muck, gravel, marl, and peat, while lower elevations toward the Illinois border exhibited sand-gravel alluvium and glaciofluvial valley trains. These trains comprised stratified loamy to coarse sand and gravel, often surmounted by aeolian dunes of well-sorted fine sand. Yellow River's confluence with the Kankakee, forming English Lake, contained fine, yellow sand.

Sand ridges and hills formed irregular belts 1–2 miles (1.6–3.2 km) wide and 10–40 feet (3.0–12.2 m) high, creating islands across the undulating landscape.

Near the Illinois border and Beaver Lake, limestone thickens and creates a ledge in the Kankakee River at Momence. This ledge was considered to be a natural dam, backing up river waters and facilitating the development of marsh soils with minerals and trace elements.

Historians noted how the meandering Kankakee River "writhed and twisted and turned back upon itself in a series of startling zigzag movements" across 300 miles (480 km). Father Stephen Badin documented over 2,000 meander bends along the 240-mile (390 km) stretch from South Bend to Momence. An engineering survey in 1871 also confirmed 2,000 river bends. Oxbow lakes formed by the river's meander bends became wetlands or filled with silt.

A 1981 geological study confirmed the Kankakee River's meandering length was 250 miles (400 km), with elevation dropping from over 700 feet (210 m) at the headwaters to 600 feet (180 m) at the Illinois border.

The Kankakee River's average speed was approximately 1.5 miles per hour (2.4 km/h), allowing terrace swamps to form. Deep gravel deposits in sand and till caused streams to flow sluggishly.

Historical size estimates of the Kankakee Marsh range from 400,000 acres (160,000 ha) to over 1 million acres (404,686 ha). Its small islands were 1–3 acres (0.40–1.21 ha), its flat elevation was 5–18 inches per mile (7.9–28.4 cm/km), and its floodplain was 85 miles (137 km) long and 3–5 miles (4.8–8.0 km) wide under 1–5 feet (0.30–1.52 m) of water. Spring floods caused the marsh to expand 1–5 miles (1.6–8 km) from the Kankakee River for eight to nine months annually. Other estimates of the marsh's width were 20 miles (32 km).

Sandy deposits dominated the marsh, with localized exposures of boulder clay and glacial till along the borders of Starke and Jasper counties. These clay deposits formed basins for small lakes, such as English Lake at the confluence of the Kankakee and Yellow Rivers.

The Kankakee riverbed consisted primarily of sand and gravel. Water hardness levels were over 300 ppm (mg/L) within the Kankakee River's overflow boundaries. The waters of its adjacent tributaries, including the Yellow and Tippecanoe rivers, were described as clear and pure. The waters contained iron and other minerals. Wetlands contained carbonic acid, producing calcareous and chalybeate springs, and forming calcareous tufa and bog iron.

Fossils

During the 19th and 20th centuries, Late Pleistocene and early Holocene fossils discovered in the marsh included deer, elk, woodland muskox, horse, and mastodon. Muck, marl, and peat deposits preserved fossils of the extinct stag-moose.

In 1870, mastodon and muskox fossils were reportedly discovered during the draining of Beaver Lake. Mastodon fossils were discovered in the Kankakee Marsh within St. Joseph and Porter counties. Mastodon fossils were also found in the 19th century within the Kankakee Marsh in Porter County, near Hebron and Kouts.

Other notable fossils included woolly mammoth and giant beaver. Giant beavers were the marsh's ecosystem engineers until their extinction 10,000 YBP.

Climate and biodiversity

Prior to modern Anthropogenic climate change, the Kankakee Marsh's paleoclimate was impacted by forces such as Milankovitch cycles, continental drift, and ocean currents. Proglacial lakes also influenced climate patterns as winds interacted with changing lake surfaces 14,200–10,500 YBP.

The Kankakee valley experienced arid conditions during the Bølling–Allerød Interstadial (14,690–12,890 YBP) and the Younger Dryas (12,900–11,700 YBP). Around 11,000 YBP, the climate transitioned from boreal to temperate. This shifted postglacial vegetation from open spruce forest-tundra to temperate deciduous forests, with deciduous trees supplanting conifers on the till plains by 9,800 YBP, followed by the development of open oak woodlands 8,000–4,000 YBP. Flora migrated through land connections, waterways, wind dispersal, or avian vectors.

By 6,000 YBP, precipitation and summer temperatures reached modern levels; by 3,000 YBP, northern hardwood forests, including oak-hickory, sugar maple, and beech were firmly established.

Early Holocene warming trends caused wildfires that triggered grassland expansion from central Illinois and Indiana toward Lake Michigan, though the Kankakee Marsh's wetlands served as a firebreak. Fires destroyed protective vegetation on sand dunes, leaving them vulnerable to wind erosion until vegetation regrowth stabilized shifting sand ridges. The first French explorers witnessed natural wildfires and fires set by Indigenous peoples for land modification in 1679.

The marsh persisted in a humid region east of the Mississippi, with its summer isothermal position placing it within the Dfa climate type of the Köppen system. The region has been described as a "Banana Belt", due to milder winters compared to surrounding areas. North of the Kankakee River featured high-moisture winds. In the 1830s, extreme winters and unseasonable colds killed wildlife and buried the region in deep snow, challenging early settlement.

The Kankakee River's meandering floodplain created biodiverse ecosystems, including oxbow lakes and freshwater marshes with aquatic plants. It contained forested swamps, shrub swamps, alkaline fens, sphagnum bogs, vernal pools, wet meadows, and sloughs. River banks were very low and consisted of sand dominated by trees and vegetation. Prairies, oak savannas and barren vegetation prevailed in the marsh's headwaters.

Shoreline fens and bogs would tremble the trees when humans walked across them. These floating peat mats provided critical nesting habitat for birds such as the pied-billed grebe.

Emerging sand ridges formed islands ranging 3–20 acres (1.2–8.1 ha), and rising 10–20 feet (3.0–6.1 m) above the wetlands. Other islands were a quarter-mile to one-and-a-half miles long. Islands lacked deep organic muck, resulting in stable, mineral-rich soils, and supported Fox grapes, wild plum, and star-flowered Solomon's seal. Localized acidic patches supported acid-tolerant (ericaceuous) plants.

Tamarack, hardwoods (e.g., oaks, maples), and shrubs (e.g., willows) existed in the marsh. Flora included black walnut, sloughgrass, red cedar, and Michigan lily.

Beaver Lake (Newton County) rested on sand, gravel, and blue till extending 100–150 feet (30–46 m) above bedrock. It measured 7 miles (11 km) long and 5 miles (8.0 km) wide and 6–9 feet (1.8–2.7 m) deep. Its beach lines rose 2–3 feet (0.61–0.91 m) above the landscape. It was covered by 40,000 acres (16,000 ha) of water. Bogus Island, in Beaver Lake's center, was covered with black cherry, and the surrounding marshes and ridges consisted of oak groves and prickly pear cacti.

Historic mammals observed in the marsh included coyote, eastern wolf, cougar, bobcat, gopher, beaver, muskrat, porcupine, and buffalo. Elk populations dwindled by the early 19th century.

Mollusks indicated healthy ecosystems in the marsh. In 1899, 63 different mollusk species were identified by geologists. Snails included Stagnicola reflexa and Lymnaea stagnalis, clams included Sphaerium and Pisidium, and mussels included Plagiola elegans and Lampsilis alatus.

Burrowing crayfish aerated wetland soils and cycled nutrients underground. The marsh's abundant fish species included green sunfish, rock bass, warmouth, and shortnose gar. Insects, including striped sedge grasshopper and oblong leaf-winged katydid, were key food sources for birds in the marsh.

Nineteenth century historians, naturalists, and hunters recorded over 225 bird species in the marsh, including permanent residents, seasonal visitors, and migratory birds. They included the prothonotary warbler, the most abundant summer species. Common species included large swarms of red-winged blackbird in grassy marshes, American golden plover in wet meadows, killdeer in dry prairies, Wilson's phalarope in marshes, American woodcock in open and forested bogs, and also American white ibis, whooping crane, and king rail. Prairie chickens bred in the wide, grassy wetlands.

Black terns were summer residents. Merganser, duck, wigeon, mallard, teal, and other waterfowl also resided in the marsh. Goldeneye and Canadian geese would remain in the marsh during winter. Yellowlegs visited the marsh during migration from their South American non-breeding sites. Wetlands such as English Lake nourished waterfowl with acorns, wild rice, and smartweed, among other marsh roots and grasses. Birds of prey, such as the bald eagle, lived regularly within the marsh and English Lake.

One of the most notable animals of the Kankakee Marsh was the passenger pigeon, which would block out the sun when they flew in flocks. One account recalled the species flying over Lake County, describing millions of birds foraging in woods and fields, and flying at all heights, darkening the sky "as if an eclipse were on."

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