SENA Lake Hiawatha Meeting Presentation

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CITY OF MINNEAPOLIS StandishEriccson Neighborhood Association Community Discussion Lake Hiawatha Recreation Center December 9, 2015 1

description

On Wednesday, December 9, SENA hosted experts from the Minneapolis Park and Recreation Board, the Minnehaha Creek Watershed District & the City of Minneapolis to present to the community on the topic of Lake Hiawatha health. Over sixty residents came to hear the presentation and participate in a discussion of the broad inputs that affect the health of the lake - some that are local, some that reach beyond the boundaries of the neighborhood. This is the information that was presented them that evening.

Transcript of SENA Lake Hiawatha Meeting Presentation

Page 1: SENA Lake Hiawatha Meeting Presentation

CITY OF MINNEAPOLIS

Standish‐Ericcson Neighborhood Association Community Discussion

Lake Hiawatha Recreation CenterDecember 9, 2015

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Presenters

• City of Minneapolis Department of Public WorksLisa Cerney, PE Director, Surface Water & Sewers Division

• Minneapolis Park & Recreation BoardRachael Crabb, Water Quality Supervisor

• Minnehaha Creek Watershed DistrictBecky Christopher, Lead Planner and Project Manager

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The Big Picture

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Drainage to Lake Hiawatha includes parts of Minneapolis and parts of cities upstream that drain to Minnehaha Creek 

Approximate size and population of drainage area to Minnehaha Creek                        

Size Population7.5 million acres          340,000  

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LakePowderhorn

Lake Nokomis

Lake Hiawatha

Six drainage areas through storm pipes to the outfalls

Six pipe outfalls to lake

Approximate size and population of drainage areas direct to Lake Hiawatha

Size Population900+  acres                        12,000  140    acres                           1,000 85    acres 7008    acres                                905    acres                                402.5 acres                               20

LEGEND

Creek flow into lake

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Bancroft Meadows Flood Basin     (Bloomington and 42nd )

Built 1989

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LakePowderhorn

Lake Nokomis

Lake Hiawatha

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Sibley Field Flood Basin (next to Sibley Field Park)

Built 1990 

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LakePowderhorn

Lake Nokomis

Lake Hiawatha

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Lake Hiawatha

37th & Columbus 2‐Cell Flood Basin 

Built 2003 

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Dry Cell  

LakePowderhorn

Lake Nokomis

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Wet Cell  

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Blue Water Partnership Rain Garden(E 43rd Street and 20th Avenue S )

Built 2012 

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Lake Hiawatha

LakePowderhorn

Lake Nokomis

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Annual City Programs

Street Sweeping

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Annual City Programs

Inspecting Outfalls

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Annual City Programs

Catch Basin StencilingBy Volunteers

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Annual City Programs

NEW in 2016!Adopt‐A‐Catch Basin Program

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Storm drains and catch basins are designed for rain and snowmelt – not leaves, grass clippings, trash or oil.

1. Sweep or rake the debris from area around grate, and dispose of in the trash.

2. If debris is lodged in the grate ‐ or visible under the grate inside the catch basin – don’t tackle this yourself.  Contact 311 for City crews to clean out.

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Lake Hiawatha: Then and NowRachael Crabb

Minneapolis Park & Recreation Board

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1850’s Era South Minneapolis

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1956

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MPRB Water Monitoring Activities since 1992

• Lake Levels• Nutrients (phosphorus, nitrogen)• Clarity (secchi depth, chloroplyll)• Physical parameters (temp., pH, conductivity)• Beach Monitoring• Phytoplankton and Zooplankton species• Aquatic plant species and abundance• Zebra mussel monitoring(since 2010)

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809

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811

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1995 2000 2005 2010 2015

Ele

vatio

n (m

sl)

Year

Lake Hiawatha OutletElevation (OHW) = 812.8…

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Trophic State Index (TSI)• Index that combines phosphorus, Secchi (clarity), and chlorophyll data calculated 

in order to characterize a lake’s overall “health”.  

• Higher scores indicate more algal biomass, lower scores indicate clearer water.

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Hiawatha TSI – Drought Years Highlighted

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Beach Bacteria Monitoring

• Weekly monitoring during swim season• “double trigger” for closure

– Single sample over 1260 cfu– Geometric mean over 126

• Multiple sources (humans, pets, animals, creek, stormwater)

• Minnehaha Creek TMDL – long term project

No waterborne outbreaks ever in MPRB system

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Beach Issues

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Recent Projects at Hiawatha

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Minnehaha Creek Influence on Lake Hiawatha

Becky ChristopherMinnehaha Creek Watershed District

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Total Maximum Daily Load (TMDL) Study

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Total Maximum Daily Load (TMDL) Study

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Upstream Improvements

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Upstream Improvements

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What Can You Do?• Source control:

• Keep stormwater where it lands• Clean up leaves, grass clippings, and trash in streets and alleys

• Specific program/events:• Annual Creek Clean‐up – July 24, 2016• Cost share grants

• http://www.minnehahacreek.org/grants• Become a Master Water Steward 

• http://masterwaterstewards.org/• December 15 deadline

• Sign up for Splash e‐newsletter