LaCount Parkway Stream Corridor Restoration Demonstration Project
City of Green Bay
Basin Program Funds:
A Streambank Stabilization Erosion Analysis Report completed November 2001 of the LaCount Ravine Riparian Corridor, included erosion classification, basic vegetation, and aquatic habitats assessments. The report noted stream erosion problems which contribute to non-point source pollution to the Great Lakes Basin in the Green Bay area. Topographic and fluvial characteristics of the proposed project area indicate a valley that is experiencing an accelerated erosion. Scouring of the stream channel and banks are contributing to non-point source water quality problems within the area. The dominant sediment sources are from hillslopes and debris flows accelerated by increase velocity resulting from storm sewers outlets. There are only a few scours pools and riffles with a distribution of fishes and invertebrate diversity.
The LaCount Parkway intermittent stream is located within the City of Green Bay. The stream is a tributary to Duck Creek Watershed and drains to the bay of Green Bay. The city of Green Bay is a developed urban area. The characterization of the current intermittent stream channel is typical for residential/commercial land use patterns. The intermittent stream is a strongly to moderately confine entrenched ravine channel. Reducing the source of sedimentation and velocity using a combination of soft bioengineering techniques, were appropriate, will greatly enhance the biological health of the stream and reduce sedimentation load. Bank failure, mass wasting, and sediment transportation will continue if no action is taken.
This project conducted a geo-technical investigation of the demonstration site to reflect any changes in stream morphology since the "LaCount Parkway Streambank Erosion Analysis Report." An interdisciplinary team of professionals examined what soft engineering / bioengineering techniques would be needed for an appropriate design for this demonstration project.
A project manager was selected and protocols for monitoring benthic invertebrate and fisheries communities were established. Vegetative buffer strips were added adjacent to the stream channel to recreate and enhance native plant populations and decrease flow within the demonstration site. Plans were made to utilize the results as a gauge for measuring success of the demonstration project site. Meetings were held to encourage private landowners to implement restoration measures on their property within the watershed and establish regulatory approaches with incentives for controlling non-point pollution. The project will also serve as educational tool to convey to the broader community that water quality and soil erosion are problems that need to be addressed.
The Demonstration Project included the construction of three weirs / dams and plunge pools to aid in the reduction of stream velocities, which in turn slows the bank erosion taking place throughout the LaCount Parkway. Additional bio-engineering best management practices (BMP’s) were added as an extra to the original scope of the project to stabilize down stream eroded banks. The bio-engineering included brush mattresses, stop logs and erosion mats with dog wood plantings. The BMP’s included toe bank stabilization with medium rip-rap, installation of coconut fiber erosion control mat, live stake plantings, brush mattress construction and the installation of single and triple stop logs in the water course.
Meetings were held with the Onedia Tribe of Indians to obtain approval and to determine the Oneida’s contributions to the success of the project. They will do vertebrate and habitat studies to determine what positive impact the Demonstration Project may have both at the project site and down stream.
Follow up site visits during the winter of 2003 through June of 2004 were conducted. The Demonstration Project Site and all additional bio-engineering BMP’s were in tact and working properly. The implementation of the weirs / small dams and plunge pools and additional BMP’s visually reduced down stream erosion of the stream bed and bank. It is estimated that 94.23 tons of soils per year were saved and that 942 pounds of phosphorous and 188 pounds of nitrogen have been reduced per year due to the implementation of this project
Contact: Mr. Matthew Heckenlaible, 920-448-3100