Wingra Park Shoreline Repair

CITY OF MADISON – PROPOSED PROJECT

 

Wingra Park‐Current Shoreline

Wingra Shoreline

Wingra Shoreline

WingraShoreline

Wingra Shoreline

Wingra Shoreline‐ Concrete Abutment + Wooden Pier

Wingra Shoreline‐ Concrete Abutment + Wooden Pier

Wingra Shoreline

Wingra Shoreline

Wingra Shoreline

Wingra Shoreline

Wingra Shoreline

Wingra Shoreline‐Plan View

Wingra‐Low Energy Shoreline

•Wave energy low•Different from Mendota/Monona•Smaller, shallower lake•Short fetch (small waves)•Short fetch (small waves)

•Cannot “hard armor” shoreline (per DNR)•Limits riprap use

Types of Shoreline Stabilization•Soft-armor bioengineering-Plant materials into structures that are designed to withstand wave and ice action

•Appropriate where plants can grow •Root structures naturally stabilize the shoreline

•Rock riprap-common hard-armor technique which consists of large rocks placed in the water and up along the shoreline

•Lined with geotextile fabric to prevent wave action from removing soil from behind rocks, causing slumping

•Erosion control fabrics-useful on slopes for holding soil in place until plants establish from seed•Geotextile fabrics-made of densely woven material that can withstand intense wave energy when placed under rock riprap

http://www.shoreline.msu.edu/shorelinemgt/erosion-control/

Lake Access Design Considerations Met with key park users throughout design process

Friends of Lake Wingra, Wingra Boats, UW Rowing, Logrollers

Equitable, sustainable opportunity for water access for multiple purposes

Signature design that provides opportunities to interact with the shoreline as well as: Reduce maintenance and capitol costs Provide shoreline protection from wave and ice damage Can be permitted through the Wisconsin DNR and Army Corp

of Engineers permitting process Aesthetic integration into the shoreline

Proposed Shoreline Changes

•Encapsulated Soil Lifts•Rock Riprap•Limestone Step Lake AccessLimestone Step Lake Access•New Dock•Moving location of UW Boating Pier•Adding small canoe/kayak launch

Wingra Shoreline‐Design Layout

Riprap‐ Rendering to Scale

Other Similar Projects:Riprap on the Yahara River

Other Similar Projects:Riprap on the Yahara River

Proposed Riprap Location

Limestone Steps‐ Rendering to Scale

Other Similar Projects:Limestone Steps on the Yahara River

Other Similar Projects:Limestone Steps being built ‐ Lake Monona

Other Similar Projects:Limestone Steps– Ester Park Lake Monona

Proposed Limestone Step Location

Encapsulated Soil Lifts‐Rendering to Scale

Encapsulated Soil LiftsGoals•Reduce erosion into lake•Aesthetically pleasing, natural

Process•Encapsulation of soil in biodegradable blankets formed into layers•The layers, or lifts, are stacked up on the bank, stepped back to create the desired slope•Seeded and planted with natives

http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/

Encapsulated Soil Lifts

http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/

Encapsulated Soil Lifts

http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/

Encapsulated Soil Lifts

http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/

Encapsulated Soil Lifts

http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/

Encapsulated Soil Lifts

http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/

Encapsulated Soil Lifts

http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/

Encapsulated Soil Lifts

http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/

Proposed Encapsulated Soil Lift Locations

Proposed Native Sedges and Forbs• Low perennials and sedges with a height <3’• Tolerant of fluctuating water and long duration under water• Planting species to be determined based on elevation from ordinary high water mark

Proposed Native Sedges and ForbsExample Plants:• Iris versicolor ‐ Blue Flag Iris• Lobelia cardinalis ‐ Cardinal Flower• Saggittaria latifolia – Arrowhead• Carex stipata – Awl‐fruited Sedge• Carex comosa – Bottlebrush Sedge• Carex molesta – Field Oval Sedge• Carex vulpinoidea – Brown Fox Sedge• Scirpus atrivirens – Dark Green Bulrush• Polygonum amphibium – Water 

Smartweed• Alisma trivale – Water Plantain• Juncus effusus – Common rush

Proposed Shoreline Changes•1:1 riprap for log rollers•Bumping out all features to protect trees•1 maple deemed unhealthy by forestry

•Will be replaced in similar area•Will be replaced in similar area•Replacing wooden deck•Moving UW Women’s Rowing dock •Small canoe/kayak launch •Resetting corner of stone wall at boat ramp

Wingra Park‐ Concrete Abutment + Wooden Pier

Wingra Shoreline

Other Shoreline Details

Anticipated Timeline

•Permitting - fall/winter 2017•Construction - early spring 2018 or late fall 2018

COMMENTS OR QUESTIONS?

Contact Information:

Jojo O’Brien266‐9721JOBrien@cityofmadison.com

Citations http://www.shoreline.msu.edu/shorelinemgt/

MSU ESL Detail