The Forest Preserve District of DuPage County has temporarily closed the northern portion of McDowell Grove Forest Preserve in Naperville to safely accommodate the Remedial Action River Cleanup, which is removing thorium-contaminated materials along the West Branch of the DuPage River.

The area is expected to remain closed through fall 2011.
The closed area begins just north of the forest preserve’s main entrance and parking lot on Raymond Drive and continues north to Warrenville Road.
It includes the West Branch Regional Trail, the underpass at Interstate 88 and other trails north of the parking lot as well as access to Mud Lake.
The Raymond Drive entrance and parking lot, however, will remain open during construction as will McDowell Grove’s reservable picnic shelter and trails and river access to the south.
The project is part of large-scale cleanup and restoration work taking place along a stretch of the West Branch of the DuPage River.
The thorium deposits originated from a former gas-light manufacturing plant that operated in West Chicago beginning in the 1930s.
Contaminated soils have been found in the river’s banks and in flood plains. They are buried under layers of clean sediment and are not considered a danger to human health.
“We appreciate everyone’s patience while this important work is underway,” says Jay Johnson, a manager of site operations for the District.
Johnson explains that the project will temporarily alter the flow of the river to expose its banks and will then bore down to remove only the contaminated soils.
Several special restoration projects have been undertaken in coordination with the thorium removal, including work underway this summer at Warrenville Grove Forest Preserve in Warrenville to alter the dam, add native plantings and create better recreational access to this historic location.
“The stretch of river that has already been restored is in beautiful condition," he said. "The water is clear, and it supports an abundance of wildlife while also offering improved access to recreational pursuits such as fishing and paddling.
"As an agency we’re looking forward to the public’s future enjoyment of a natural resource in its best condition and to healthier habitat for plants and animals,” he adds.
Good things happen when you explore the Forest Preserve District of DuPage County’s 60 forest preserves and five education facilities.
For information on ways to experience conservation, education and recreation in your neck of the woods, call 630-933-7200, or visit dupageforest.org.