Lake Koshkonong Project Workshop 3 - - PDF document

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Lake Koshkonong Project Workshop 3

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Improve navigation in Lake Koshkonong and on the Rock River 2. Protect and improve wetland habitat and water quality 3. Protect, restore and create fish and wildlife habitat 4. Enhance the value of the Lake in as a recreational destination

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• Navigation access dredging $$$
• Islands and breakwaters $$$
• Shoreline protection
• Navigation hazards
• Fisheries
• Wetlands

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• Ecological data collection
• Further evaluation of dredging, breakwater

and island construction

• Identification of experiments
• RKLD team currently completing description
• f a range of projects for detailed

evaluation by Corps of Engineers and DNR

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Coontail

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Coontail $ +' ,

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• Expensive
• Alternative layout and

depths

• Beneficial use of spoil vs.

disposal

• Chief question: rate of infill

and sediment transport

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Lakebed Sediment Sampling

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70% fine sand (some locations)

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• Islands
• Uplands
• Natural shoreline

areas subject to erosion

• Containment options

– Geotubes – Stone Berms

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• Offshore islands & breakwaters
• Nearshore islands and

breakwaters – pros & cons

• Onshore revetments:

– Standardized designs – Both River and Lake designs – Consider high & low lake stages

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• Natural shoreline

erosion

• Access requirements
• Difficult offshore /
• nshore choices

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• Spawning: areas adjacent to Lake

Koshkonong – protection and enhancement

• Rough fish control: upstream control & in-

lake harvesting

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Mud Lake Protection and Enhancement Projects

• Repair or rebuild carp gate structure and install new gate

with floating top to accommodate boat access.

• Build up shoreline to near 780 msl with dredge spoils or

breaker run armored with riprap

• Build access road to carp gate at or above 780 msl for

maintenance, stocking access of Mud Lake

• Possibly install low fence on Blackhawk Island Road side
• f Mud Lake to keep carp out during floods over 781 msl
• Actively manage Mud Lake to keep aquatic invasive

species (AIS) from becoming established.

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• Collect field data on critical aspects of

potential full-scale projects

• Not all potential experiments will be

implemented – funding to be determined

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• Protect eroding wetland shoreline

that could breach

• Provide additional wetland habitat

that has been lost in historic time

• Dredge large enough area adjacent

to boat launch ramp so that monitoring of sediment transport is representative of potential large- scale projects

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• Dredge for shoreline

navigation access at the North Shore Boat Landing

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• Construct a 550’

breakwater near Mud Lake to fill dredge material behind

• Restore the fill area
• Protects Mud Lake by

keeping it separate from Lake Koshkonong.

• Creates habitat for

wildlife

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Shoreline between Mud Lake and Lake Koshkonong needs reinforcement. Mud Lake A break in the shoreline between Mud Lake and Lake Koshkonong.

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White Crow Bay Credit: Microsoft Bing

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• Construct containment breakwater–

possibly late fall/ winter

• Dredge North Shore Road boat landing,

with spoils placement behind breakwater

• Restoration vegetation and

maintenance

• Monitoring

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• Carp gate in channel to Mud Lake is in need of

repair/replacement– implement and monitor design approach

• Must accommodate public access
• Keeping spawning carp out and allowing game- and

pan-fish egress to main Lake

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Cootes Paradise Fishway: Hamilton, Ontario Carp Fence at Tonetta Lake, NY

Expect to try net (possibly multiples) with floating top, anchored the bottom, similar to DNR experience on Lake Butte des Morts

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• Install carp gate– Winter condition drawdown
• Monitor carp movement and blockage
• Monitor changes in Mud Lake

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www.ma-rs.org dredge area breakwater

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• Monitor access channel sediment

accumulation for documenting the efficiency of selected navigation improvements #163, #1634!%

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• Access and shoreline arrangements
• Construct breakwater
• Dredge oxbow channel and Lake in front of

the channel in Bingham

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Floating Island in Lincoln Park Zoo: Chicago, IL

Dimensions vary 8"

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Area (sq ft)

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• Test concept to see if floating island is

appropriate for Lake Koshkonong or protected water near the Lake

• Waterfowl or wildlife habitat
• Limit potential for “rafting” and loss of

wetland floating mats during flood condition

• Possible wave protection applications

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• Access and placement discussions
• Assembly and placement
• Monitoring

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Rock River, Upstream of Lake Koshkonong Lake Koshkonong at Northshore Road

Credit: Microsoft Bing Credit: Microsoft Bing

House on Blackhawk Island

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• Develop standardized designs for shoreline

protection on Riverfront, protected Lakefront, expose Lakefront –

• “normal pool” protection to be secure but

limit visual impact

• “flood condition” protection to limit wave

impacts when water levels are highest

• These designs could be examples for shoreline

residents to implement

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• Identify a candidate sites
• Develop and install designs
• Monitor erosion at toe, erosion of

upland areas, beach effects

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• Navigational hazard removal

and marking

• Rock River water quality
• Local water quality issues

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• RKLD completing full-scale and

experimental project proposals

• Corps of Engineers and DNR review and

environmental assessment development: this fall and winter

• Possible experiment installations
• Planning assistance to states project

completion 2011

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Questions? Thank you!

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Keep your questions and comments coming via the website

• r by e-mail to RKLD, the Corps of

Engineers, or Wisconsin DNR.