Carp beware! The installation of the new carp barrier and maintenance deck for the District’s ferric chloride weir is now complete. The new structure will prevent carp from accessing the upstream Geis wetland for spawning, includes safety improvements for staff that will allow for easier maintenance. The new barrier replaces an older barrier which was no longer functioning well and was more challenging to maintain.
The photo below shows the downstream side of the ferric weir with the carp barriers in place. The angled tines of the carp can be temporarily lowered to dislodge any debris caught by the grates.
Common carp are a non-native invasive species from Eurasia which are currently found in many District lakes and associated wetlands. Common carp compete with native species and their bottom-feeding habits stir up sediment, reducing water quality and uprooting beneficial aquatic plants in our lakes. The District has a comprehensive carp management program which seeks to control the carp populations in District lakes and wetlands to levels and bring the populations below levels which harm the lakes. For more information on our carp program, visit the project page here.
The ferric chloride facility treats water from the County Ditch 13 system before it enters Spring Lake. Spring Lake is impaired for excess levels of phosphorus and the ferric chloride system removes phosphorus before it reaches the lake. Ferric chloride binds with phosphorus which makes it unavailable to algae. For a video tour of the ferric chloride system, visit our YouTube page here.
For more information on the ferric chloride facility, visit the project’s page on our website.View Full Article