The Douglas County Highway Department has applied for an incidental take authorization regarding Illinois State-endangered mussel species – Purple Lilliput (Toxolasma lividum). The application is based upon potential impacts resulting from in-stream work associated with proposed bridge carrying TR 218 (760N) over Brushy Fork 4 miles southwest of Newman, Douglas County, Illinois.
- The mailing address of the Douglas County Highway Department is 200 S. Prairie, Tuscola, IL
61953, Attn: James Crane, County Engineer.
- The project construction area is located on TR 218 (760N) over Brushy Fork 4 miles southwest of
Newman, Douglas County, Illinois; more specifically located at Township 15 North, Range 10 East,
NW/4, Section 11, 3rd Principal Meridian.
- Construction activities associated with proposed improvements within the stream will be limited to
County ROW; the proposed improvement area being approximately 1.50 acres. Temporary
impacts may occur within the 1.50 acres with permanent impacts from construction activities being
approximately 0.10 acres. Douglas County has minimized the impact footprint within the species
aquatic habitat to the extent possible; the estimated suitable mussel habitat within the project
footprint is approximately 0.02 acres along both stream banks.
- The proposed project consists of replacing the existing six span bridge over Brushy Fork with a
new three span bridge structure. The construction activity to replace the bridge may take an
undetermined amount of the Purple Lilliput mussel. The mussel may be impacted by construction
activities in the stream, which is to include removal of the existing bridge piers and the grading and
placement of riprap on the stream banks.
- Measures to be taken to minimize impacts to the mussel include:
- Erosion and sediment control measures will be utilized during construction to minimize impacts
to the stream habitat and to minimize sedimentation in the stream.
- Siltation during all phases of construction will be minimized through use of proper soil erosion
and sediment control measures such as floating silt fences to prevent sediment from entering
the stream. The Resident Engineer (RE), acting as the county’s representative, will inspect and
ensure maintenance of all silt fences, silt curtains, and other erosion control structures. If site
inspections show that measures in place are not functioning or are not adequate, different
or additional measures will be added. If unforeseen observations or events pertaining to listed
species are identified during construction, IDNR will be contacted.
- During on-site work, The Resident Engineer (RE), acting as the county’s representative, will
conduct daily inspections of the erosion and sediment control practices to ensure proper
working order and maintenance. Additional inspections will be made immediately prior to and
following events of heavy rain. If eroded soil is observed leaving the limits of construction,
additional soil conserving practices will be installed, or measures taken to minimize soil erosion.
- The mitigation amount specified in the Conservation Plan will be paid to the Wildlife
- A copy of the Conservation Plan is available for review at the Tuscola Public Library, 112 E Sale
Street, Tuscola, Illinois 61953. A copy of the Conservation Plan is also available online at:
Incidental take Authorization 231
- Comments should be directed to:
Illinois Department of Natural Resources
Office of Resource Conservation
Incidental Take Authorization Coordinator
One Natural Resources Way
Springfield, IL 62702
- The comment period closes 30 days after the final publication of this notice.