Jack In The Box

CON/SPAN^® Bridge Systems was specified for this project due to concern for the Nashville crayfish. The Nashville crayfish is presently only found in the Mill Creek drainage shed in Tennessee. The species has been listed as Endangered in the Federal Register since 1986.

Acccording to the U.S. Army Corps of Engineers, the “biological communities inhabiting Mill Creek during the 1981 survey indicated water of fair to very poor quality and the influence of moderate to extensive enrichment disturbance.”

The Tennessee Department of Environment and Conservation required a clear span structure to minimize impact to the stream and specifically to the Nashville crayfish. This CON/SPAN was installed in a day with minimal disturbance to the area. The use of the CON/SPAN system allows for the preservation of the limestone bedrock and gravel habitat that is best suited for the Nashville crayfish.