Woodlands along the Des Plaines River. Photo © Chip Williams.

At first glance, the woodlands along the Des Plaines River in southern Lake County appear healthy. However, extensive research shows that most of the oaks are very old and very few young oaks are growing in the understory to replace them. This is having a domino effect on native animals such as songbirds and butterflies, and the native shrubs and wildflowers they require. 

Beautiful oak woodlands define the unique natural landscape of Lake County that we all enjoy. Oak trees create an environment that maintains critical ecosystem processes and species diversity. 

Unfortunately, oak woodlands are in trouble across the eastern United States, particularly so in this area. We need to return the amount of light that reaches the ground to healthier levels. This will allow for the regeneration of oaks and other native trees, shrubs and wildflowers.

Without action, our oak woodlands will not survive. They will be replaced by denser, darker forests that lack the rich and colorful variety of songbirds, butterflies, wildflowers, shrubs and other abundant forms of life we value as a community.

We will continue removing trees and thinning the understory in particularly vulnerable preserves to allow enough sunlight to reach oak seedlings and saplings. The project areas include:

MacArthur Woods | Mettawa

Selective clearing within a 22-acre section of northern flatwoods and a 29.9-acre section of moderately moist and moderately dry forests.

Ryerson Conservation Area | Riverwoods 

Selective clearing within a 12.8-acre section of northern flatwoods and fen communities and a 44.6-acre section of moderately moist and moderately dry forests.

Wright Woods | Mettawa

Selective clearing within a 43.4-acre section of northern flatwoods and a 20.6-acre section of moderately moist forest.

Goals of this restoration project are broad reaching and long-term:

  • Restore light transmission in these woodlands to 30–50 percent
  • Increase oak regeneration and the diversity of tree species and sizes 
  • Restore the abundance and diversity of native shrubs and ground-layer plants 
  • Create a mosaic of habitats, improving conditions for plants and wildlife 

Our efforts to improve oak woodlands are supported by Chicago WildernessIllinois Nature Preserves CommissionIllinois Department of Natural ResourcesMorton ArboretumU.S. Forest Service and U.S. Fish and Wildlife Service. These expert partners, as well as Chicago Botanic GardenIllinois Natural History Survey and Lincoln Park Zoo, will help us monitor plants, animals and environmental conditions to evaluate success of this project for years to come. 

Further Information

This project was featured in the Summer 2012Winter 2012Fall 2013 issues of our quarterly newsletter, Horizons

To schedule an educational presentation about this project for groups of 10 or more, or to request copies of the Woodland Habitat Restoration Project Summary and Report and Frequently Asked Questions, email or call us at 847-367-6640.

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