Elgin O’Hare Western Access – I-390

Construction projects along I-390 include 17 miles of new roads with 15 new or improved interchanges, rehabilitating and widening Illinois Route 390, formerly known as the Elgin O’Hare Expressway, and extending it east along Thorndale Avenue to O’Hare International Airport and building a new roadway around the western border of O’Hare linking the Jane Addams Memorial Tollway (I-90) and the Tri-State Tollway (I-294).

As part of the construction project, we assessed stream sites in the corridor.

Aquatic Macroinvertebrates


– Sensitive groups of macroinvertebrates (EPT) were absent or extremely depressed at some sites and replaced with more tolerant taxa (e.g., worms, isopods).

– Overall, 3 families of Ephemeroptera, no Plecoptera, and 4 families of  Trichoptera were found
– Flatworms (Platyhelminthes), amphipods, oligochaete worms (Clitellata), and chironomids were collected at all sites
– Hydropsychid caddisflies (Hydropsychidae: Cheumatopsyche spp.), blackflies (Simuliidae: Simulium spp.), isopods (Asellidae: Caecidotea spp.) and snails (Gastropoda) were found at 3 out of 4 sites

White heelsplitter – Lasmigona complanata


– Native freshwater mussels were rarely encountered across the study sites.

– The 2 species found (P. grandis and L. complanata) are typically considered tolerant to poor water quality and use a suite of host fish for successful metamorphosis, allowing them to persist in degraded stream
– Historically, 10 species were found in that area


Bluegill – Lepomis macrochirus

– Fish communities consisted of primarily common tolerant species.

– 16 species of fish total
– Three most abundant species were Bluegill (Lepomis macrochirus), Blackstripe Topminnow (Fundulus notatus), and Bluntnose Minnow (Pimephales notatus)




For more information on construction visit the Illinois Tollway website.