Cache River

About

Cache River, Illinois — The 'Land Between the Rivers'. Long before the French arrived, the Cache River basin lay within the broader Mississippian culture zone, its rich wetlands supporting large populations. Nearby Kincaid Mounds, occupied from roughly 900 to 1400 CE, ranked among the largest Mississippian settlements north of Cahokia; the site is preserved today as a state historic site. The wetlands that fed those communities remain the river's defining feature.

When French fur traders came in the late 1600s, they gave the river its enduring name — "Cache," French for hiding place — using its sloughs to stash pelts. The river became part of the Illinois Country's French colonial boundary, and the name outlasted the empire that coined it. In 1846 the town of Mounds was founded along the Cache, near the ancient earthworks that gave it its name.

The old-growth forest that ringed the river drew industry. From the 1830s through the 1920s, the Cache River watershed was logged to supply the regional timber industry of the 1850s through 1910s and the railroad expansion of the 1860s through 1910s. Local sawmills, logging drives, and downstream lumber operations were the major operators. The exhaustion of the old-growth stands around 1910, the start of state forestry conservation in 1915, and the establishment of state forests in the 1930s together ended large-scale logging.

The river drew scientific attention as well. The first comprehensive hydrological studies came with the USGS surveys of the 1870s through 1890s, the gauging-station establishment of the 1880s through 1910s, and the state geological survey streamflow assessments of the 1910s through 1930s. State water pollution control studies in the 1950s through 1970s and Clean Water Act assessments from 1972 to 2000 addressed more than a century of logging, agricultural, and industrial impacts, work that continues through modern restoration and TMDL programs. Today USGS streamgage 03612000 tracks the river, which averages about 380 CFS.

Protection of the swamp itself accelerated in the modern era. In 1996 the Cache River wetlands were designated a Ramsar Wetland of International Importance, recognizing the ancient cypress swamp as globally significant. The state now protects much of the landscape within the Cache River State Natural Area, a tract totaling 14,960 acres across Johnson, Massac, and Pulaski counties. Threaded through it lies the thousand-acre Heron Pond–Little Black Slough Preserve, owned by The Nature Conservancy and designated a National Natural Landmark.

For paddlers, the Cache is flatwater — a Class I river with an optimal flow range of roughly 100 to 500 CFS. The Lower Cache offers prime paddling through cypress swamp, a drowned world of standing water where the oldest trees rise from the muck. Heron Pond, with its old-growth bald cypress, is walk-in only. Seasonal paddle tours run through operators such as Shawnee Forest Outfitters, letting visitors thread quiet water beneath trees that were already ancient when the fur traders first named the river.