5.9 Summary

The following tables summarize the proposed implementation action items, their relationship to the problems and issues identified in Section 3.0 above, the metrics by which the District will be evaluating progress toward resolving those issues and problems, the estimated District cost of implementing these actions, and anticipated implementation schedule.

 

Problem or Issue

Actions in Implementation Plan

Degree of Improvement

Water Quality

  • The water quality in Long Lake has consistently been scored in the C-D grade range on the District’s annual lake report cards.    Water quality in both Long Lake and Tanager Lake exceeds state water quality standards for total phosphorus, and phosphorus loading reductions would be necessary to achieve either of the desired interim or long-term goal in-lake phosphorus concentrations.   Little or no data is available for Holy Name, Wolsfeld, and Mooney Lakes.
  • A phosphorus load reduction plan for Long Lake and Tanager Lake that sets forth actions to reduce loading to meet in-lake P concentration goals.  These actions include an enhanced regulatory program, LGU requirements to reduce phosphorus form existing development, and capital projects to reduce internal and external loads.
  • Implementation of all the actions in the phosphorus load reduction plan would theoretically reduce in-lake P concentrations, improve water clarity, and meet District water quality goals.

 

  • Continue monitoring Long Lake, Tanager Lake and Long Lake Creek, and obtain baseline data for other lakes through Citizen Assisted Monitoring program or satellite data. 
  • Baseline data would fill a data gap and provide for tracking water quality trends across the subwatershed.
  • Phosphorus loads in Long Lake Creek increase upstream to downstream, and dissolved oxygen can fall below the state standard during low flows.
  • A diagnostic and feasibility study assessing stream water quality included as part of a proposed Tanager Lake internal load management project.
  • Would depend on outcome of stream water quality diagnostic and feasibility of implementing improvements.
  • A stream restoration project to stabilize a reach of Long Lake Creek that has the highest concentration of erosion issues would also include in-stream habitat improvements to mitigate low-flow dissolved oxygen conditions.
  • Restoration project would start to address habitat and stream water quality issues, but degree of improvement would depend on outcome of diagnostic.
  • Development and redevelopment in the subwatershed will increase nutrient and TSS loads from the watershed as well as increasing the volume of stormwater runoff.
  • Rules will be amended to require more stringent pollutant load reduction on new development and redevelopment, including adding a volume management requirement to reduce pollutant transport.
  • Would depend on ability of developers to incorporate adequate BMPs on their projects and properly maintain them to sustain removal efficiencies.
  • Erosion and channel gullies in the Wolsfeld Woods Scientific and Natural Area (SNA) may be contributing sediment and nutrients to Wolsfeld Lake (within the SNA).
  • Staff will work cooperatively with the DNR and other interested parties to identify and address potential sources of pollutant and sediment loading in the SNA.
  • Depends on extent of problem and ability to develop cooperative or collaborative improvements.

Water Quantity

  • Drainage is conveyed through the subwatershed through several streams and channels to Long Lake Creek. 
  • A study to identify first-order streams in the watershed and to identify, inventory, and prioritize channel, shoreline, and other erosion problems in addition to hose already identified by other means.
  • Would improve District knowledge of conditions in the watershed and identify areas for future improvement.
  • The HHPLS identified a number of locations that are predicted to overtop during the 100 year event
  • LGUs directed to evaluate these locations as part of their local water management planning.
  • Completed as LGUs complete their local plans.
  •  Development, redevelopment, and reconstruction in the subwatershed, especially in the area west of Long Lake and north of US Highway 12, is predicted to increase volume of stormwater runoff from the watershed as well as increased nutrient and TSS loads.  The HHPLS model predicted that development in the western subwatershed along the US Highway 12 corridor by 2020 would likely have impacts on the ravine carrying drainage from that area to the Park Ponds and thence to Long Lake.  The HHPLS scour analysis identified that reach as having high erosion potential, and the Regional Team identified an erosion site on that channel.
  • Rules will be amended to require more stringent pollutant load reduction on new development and redevelopment, including adding a volume management requirement.
  • Would depend on ability of developers to incorporate adequate BMPs on their projects and properly maintain them to sustain removal efficiencies.
  • Cooperatively construct regional infiltration improvements to mitigate impact of new runoff from development.
  • Work cooperatively with LGUs to restore sport erosion problems.
  • Depends on extent of problem and ability to develop cooperative or collaborative improvements.
  • The HHPLS identified several locations where for both existing and future conditions, higher velocities than desired may result in erosion at outlets or culverts.   These include private drives, four city streets, US Highway 12 crossing, and a Luce Line Trail crossing.  Erosion control or energy dissipation measures may be required in those locations
  • LGUs directed to evaluate these locations as part of their local water management planning.
  • Completed as LGUs complete their local plans.
  • Several landlocked basins are present in the subwatershed.  Mooney Lake has no natural outlet and the District has developed and implemented a cooperative emergency pump-out plan with the City of Plymouth.
  • Cities are prohibited from adding outlets to landlocked basins, and must provide for adequate storage and volume control.
  • The capital improvement program includes an emergency pump outlet for Mooney Lake
  • Plymouth is directed to evaluate ways to reduce inflows to Mooney Lake and implement improvements.
  • Completed as LGUs complete their local plans.
  • The emergency pump outlet would resolve the emergency situation, while long-term resolution depends on the ability of Plymouth to reduce volume to the lake.

Wetlands

  • The subwatershed includes numerous wetlands with high to exceptional vegetative diversity, fish and wildlife habitat and aesthetic values that should be protected.
  • Key Conservation Areas identified that include high-value wetlands.  Some of these areas are identified as District priorities for continued implementation of the Land Conservation Program, and thus the District would proactively look for opportunities to conserve these resources. The Capital Improvement Program includes funds for Land Conservation Activities.   In all key areas, LGUs are required to include in their local plans strategies for conserving these values.
  • Ongoing effort that is dependant on property owner willingness to pursue conservation, District budget and staff capacity, and LGU plan completion.
  • Rules will be amended to establish management standards based on management classification for impacts to wetlands from development and redevelopment.
  • Implementation of revised rules would help minimize future impacts to the highest-value wetlands while still providing a measure of protection to those that provide mainly downstream resource protection.
  • Wetlands with high to moderate restoration potential should be considered for protection and restoration.
  • Several potential wetland restorations are identified and funds set aside in the capital improvement program to begin restoration.
  • Wetlands identified as being of high to moderate wetland potential would be managed according to a Manage 1 wetland classification if they have been assessed as a Manage 2 or 3.   This would minimize further degradation that might make future restoration more difficult or costly.
  • An initial effort that identifies for restoration those wetlands that would technically be easiest to restore, and those in Key Conservation Areas that may benefit most from restoration.   This would begin to mitigate wetland losses from past development and help to increase the quantity and quality of wetlands present.

Ecologic Integrity

  • Most of the subwatershed is characterized by large open areas of forest, grasslands, and wetlands punctuated by low density development.  Intensive uses are concentrated along the US Highway 12 corridor and on the eastern subwatershed boundary in the City of Plymouth.  Two Scientific and Natural Areas preserving Big Woods remnants are present in the subwatershed, as are large areas designated as Regionally Significant Ecological Areas.  Wetlands with high ecological value are present and those wetlands and associated upland areas should be conserved to preserve their values, create larger areas of ecological value, and connect existing resources.

 

  • Key Conservation Areas identified that include high-value wetlands.  Some of these areas are identified as District priorities for continued implementation of the Land Conservation Program, and thus the District would proactively look for opportunities to conserve these resources. The Capital Improvement Program includes funds for Land Conservation Activities.   In all key areas, LGUs are required to include in their local plans strategies for conserving these values.
  • Ongoing effort that is dependant on property owner willingness to pursue conservation, District budget and staff capacity, and LGU plan completion.

The Long Lake fishery was last surveyed in 2001 and revealed a good sport fishery periodically stocked by the DNR with walleye.  Mooney and Wolsfeld Lakes are panfisheries.  Tanager Lake contains both sport and panfish

  • Support the fisheries through improvement of water quality, management of aquatic vegetation where internal load management is required, and the promotion of shoreline restoration.
  • Evaluate need for fishery management to control internal phosphorus loading as part of the Long Lake and Tanager Lake diagnostic and feasibility studies.
  • Depends on response of natural system to improved water quality

Eurasian water milfoil is present in Long Lake and Tanager Lake.

 

  • Support the DNR in its management efforts.  Evaluate milfoil management as part of internal load management diagnostic and feasibility study.
  • Depends on the extent of infestation.  If control of milfoil and other invasive aquatic vegetation will help achieve internal phosphorus load reduction goals, then a significant improvement can be had through chemical or other control.  If control would not benefit lake water quality, then there would be no improvement.

No comprehensive aquatic plant survey data is available for these lakes

  • Conduct aquatic plant surveys as part of internal load management diagnostic and feasibility studies for Long Lake and Tanager Lake.
  • Completion of these surveys would fill this data gap.

Macroinvertebrate communities in Long Lake Creek are limited by water quality and to a lesser extent by the type of habitat available.

 

  • A diagnostic and feasibility study assessing stream water quality included as part of a proposed Tanager Lake internal load management project.
  • Stream restoration project proposed for a reach of Long Lake Creek that includes a high concentration of erosion areas.  This project would include in-stream and buffer habitat improvement as well as streambank stabilization.
  • Monitor macroinvertebrate community every three years.
  • Update stream condition assessment every five years.
  • Depends on response of natural system to improved water quality and habitat

Corridor connections between Key Conservation Areas should be preserved, enhanced and restored.  Figure 19 identifies a corridor throughout the subwatershed which should be promoted for conservation through District efforts as well as local planning. 

 

  • Key Conservation Areas identified that include high-value wetlands.  Some of these areas are identified as District priorities for continued implementation of the Land Conservation Program, and thus the District would proactively look for opportunities to conserve these resources. The Capital Improvement Program includes funds for Land Conservation Activities.   In all key areas, LGUs are required to include in their local plans strategies for conserving these values.
  • Ongoing effort that is dependant on property owner willingness to pursue conservation, District budget and staff capacity, and LGU plan completion.

Groundwater

There are a number of areas in the subwatershed that are very highly or highly sensitive to aquifer impacts.

  • Amend rules to require pretreatment of stormwater discharged to wetlands or infiltration areas in the areas of high aquifer sensitivity.
  • Establish a new District rule that requires an additional level of analysis and review of permitted development and redevelopment where there is a potential for development to adversely impact groundwater connected to a surface water feature.
  • Will help minimize future impacts to groundwater and provide for proactive management rather than reactive.

Wellhead Protection Areas and associated Drinking Water Sensitivity Management Areas have been identified for the cities of Long Lake and Plymouth within this subwatershed. 

 

  • Stormwater and groundwater management within those areas will be coordinated with wellhead protection plans.
  • Will help minimize future impacts to drinking water and provide for proactive management rather than reactive.

Many of the major wetlands in the subwatershed were identified in the FAW as discharge or combination recharge-discharge wetlands.  Several recharge wetlands are located in the western subwatershed north of Highway 12 and west of Willow Drive.  As development occurs it will be critical to maintain runoff and infiltration rates to help maintain hydrology to these wetlands.

 

  • Amend rules to require infiltration or abstraction of the first one inch of rainfall on new permitted development and redevelopment.
  • Identify a network of surficial aquifer monitoring wells across the watershed, monitor groundwater levels and quality.
  • Promote Better Site Design (Low Impact Development) principles for new development that mimic predevelopment hydrologic regime.

 

  • Infiltration on site will assist in preventing further modification of surficial groundwater recharge and help to maintain wetland hydrologic regimes.

Groundwater hydrology is an important component in the base flow for area streams.  Protecting existing groundwater flow regimes must remain a priority.

  • Amend rules to require infiltration or abstraction of the first one inch of rainfall on new permitted development and redevelopment.
  • Infiltration on site will assist in preventing further modification of surficial groundwater recharge and help to maintain wetland hydrologic regimes.
  • Identify a network of surficial aquifer monitoring wells across the watershed, monitor groundwater levels and quality.
  •  
  • Implementation of monitoring network will fill data gap and allow for identification of trends.
  •  
  • Identify baseflow in Long Lake Creek and monitor for trends.
  • Identification of baseflow will fill  data gap, allow for identification of trends, and improve understanding of hydrology and hydraulics of  Long Lake Creek.

Objective

Metric

Existing

Desired

Location

Water Quality

Phosphorus Loading (lbs annually)

1,540 (Ultimate)

906

Long Lake

Phosphorus Loading (lbs annually)

1,700

(Ultimate)

832

Tanager Lake

Water Quantity

Volume Reduction (Acre-feet)

-

196

Watershed-wide

1.5 year discharge (cfs)

708.8

708.8

Watershed-wide

100 year discharge (cfs)

708.8

708.8

Watershed-wide

Ecologic Integrity

Index of Biologic Integrity

6.08-6.15

(F-IBI)

Above MPCA impairment threshold

Long Lake Creek Reach 5

N/A

Above MPCA impairment threshold

Long Lake Creek Reach 4

6.00

(F-IBI)

Above MPCA impairment threshold

Long Lake Creek Reach 3

N/A

Above MPCA impairment threshold

Long Lake Creek Reach 2

5.91

(F-IBI)

Above MPCA impairment threshold

Long Lake Creek Reach 1

Stream Visual Assessment Protocol

N/A

5.0 or 1+ existing

Long Lake Creek Reach 5

N/A

5.0 or 1+ existing

Long Lake Creek Reach 4

N/A

5.0 or 1+ existing

Long Lake Creek Reach 3

N/A

5.0 or 1+ existing

Long Lake Creek Reach 2

N/A

5.0 or 1+ existing

Long Lake Creek Reach 1

Key Conservation Areas conserved (acres)

 

300

Watershed-wide

Wetlands

Wetland Acreage

2,223.0

2,223.0 or greater

Watershed-wide

619.1

619.1 or greater

Preserve

770.3

770.3 or greater

Manage 1

212.9

212.9 or greater

Manage 2

189.2

189.2 or greater

Manage 3

Table 20.  Summary of Long Lake Creek subwatershed implementation program.

Item

Description

Estimated Cost

Schedule

Section 3.0 Problems Addressed

MCWD Capital Projects

1

Long Lake internal load management project

$288,000

2012

3.1.1,3.1.2, 3.1.3,

3.2.3, 3.4.2, 3.4.3, 3.4.4, 3.4.5

2

Construct Tanager Lake treatment pond in LLC-48

$635,300

2016

3.1.1, 3.1.2, 3.1.3, 3.2.3

3

Construct Tanager Lake treatment pond in LLC-51

$475,800

2013

3.1.1, 3.1.2, 3.1.3, 3.2.3

4

Long Lake Creek restoration project

$287,200

2012

3.1.2, 3.2.1, 3.4.5,

5

Wetland restoration project 1

$370,500

2008

3.3.2, 3.4.1, 3.4.6

6

Wetland restoration project 2

$434,200

2010

3.3.2, 3.4.1, 3.4.6

7

Mooney Lake emergency pumping

$125,000

2007

3.2.5

8

Regional infiltration

$117,500

2011

3.1.1, 3.1.2, 3.1.3, 3.2.3, 3.3.1, 3.4.1, 3.5.1, 3.5.3, 3.5.4

$213,700

2014

$163,500

2015

$185,300

2016

MCWD Data Acquisition/Study

1

Identify keystone, umbrella, and indicator species, evaluate habitat, and develop conservation strategies

Part of watershed-wide study

2010 and ongoing

3.3.1, 3.3.2, 3.4.1, 3.4.2, 3.4.3, 3.4.4, 3.4.5

 

2

Develop infiltration/filtration strategies appropriate to wellhead protection areas and areas of groundwater sensitivity

Part of watershed-wide study

2008

3.1.2, 3.1.3, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.3.1, 3.4.1,

3.5.1, 3.5.2, 3.5.3

MCWD Land Conservation Program

1

Undertake land conservation efforts in accordance with Figure 19

$2,805,000

Part of ongoing watershed-wide program

3.1.1, 3.1.2, 3.1.3, 3.2.1, 3.2.2, 3.2.3, 3.3.1, 3.3.2, 3.4.1, 3.4.5, 3.5.1

MCWD Regulatory Program

1

Amend District Rules to increase stormwater management requirements for new development and redevelopment

Part of watershed-wide effort

2007-2009

3.1.1, 3.1.2, 3.1.3, 3.3.1, 3.4.1, 3.4.2, 3.4.3, 3.4.5

2

Amend District Rules to  require abstraction of 1” of rainfall from new development and redevelopment

Part of watershed-wide effort

2007-2009

3.1.1, 3.1.2, 3.1.3, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.3.1, 3.4.1, 3.5.1

3

Amend District Rules to adopt wetland management rules based on wetland management classification

 

Part of watershed-wide effort

2007-2009

3.1.3, 3.2.3, 3.3.1, 3.3.2, 3.4.1, 3.5.1

MCWD Hydrodata Program

1

Monitor Long Lake, Tanager Lake  and Long Lake Creek

Part of watershed-wide hydrologic data program

Part of ongoing watershed-wide program

3.1.1, 3.1.2, 3.1.3, 3.2.1, 3.2.3, 3.5.1

 

2

Obtain baseline water quality data for Wolsfeld, Holy Name, and Mooney Lakes and update every 3-5 years

Part of watershed-wide hydrologic data program

Part of ongoing watershed-wide program

3.1.1, 3.1.2, 3.1.3, 3.2.3, 3.2.5

 

3

Monitor macroinvertebrates in Long Lake Creek every three years

Part of watershed-wide hydrologic data program

2009, 2013

3.1.1, 3.1.2, 3.1.3, 3.2.1, 3.2.3, 3.4.1, 3.4.5

4

Identify shallow wells to monitor groundwater levels

Part of watershed-wide study

2008 and ongoing

3.2.1, 3.2.3, 3.3.1,

3.4.1, 3.4.5, 3.5.1

MCWD Education/Communication Program

1

Provide targeted education materials to key stakeholder groups to meet objectives of plan

Part of watershed-wide education program

Part of ongoing watershed-wide program

All

2

Provide educational opportunities for LGU staff, developers, and other interested parties

Part of ongoing watershed-wide education program

Part of ongoing watershed-wide program

All

3

Promote the development of a Long Lake Association

Part of watershed-wide education program

Part of ongoing watershed-wide program

3.1.1, 3.1.2, 3.1.3, 3.2.3, 3.4.2, 3.4.3, 3.4.4

4

Recruit and train volunteers to monitor vegetation in Long Lake

Part of watershed-wide education program

Part of ongoing watershed-wide program

3.1.1, 3.1.2, 3.1.3, 3.4.2, 3.4.3, 3.4.4

5

Develop a small grant program to provide financial assistance to property owners desiring to implement BMPs on their property or to install demonstration projects on public property

Part of watershed-wide program

2008 and ongoing

3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.2.3, 3.3.1, 3.3.2, 3.4.1, 3.5.1

 

MCWD Operations and Maintenance

1

Inspect Long Lake Creek and Ditch #27 channel annually

Part of watershed-wide program

Part of ongoing watershed-wide program

3.1.1, 3.1.3, 3.2.1, 3.2.3, 3.2.4.3, 3.4.5

2

Monitor high vegetative-diversity wetlands for exotic species

Part of watershed-wide program

Part of ongoing watershed-wide program

3.4.1

3

Maintain detention ponds to sustain removal efficiency

Ongoing for existing projects. Incorporate into life-cycle cost of new projects.

Part of ongoing watershed-wide program

3.1.1, 3.1.2, 3.1.3

Collaborative Projects

1

Work cooperatively with cities to identify and repair erosion on Long Lake Creek and Ditch #27

Part of watershed-wide cost-share program

2008 and ongoing

3.1.1, 3.1.3, 3.2.1, 3.2.2, 3.2.3, 3.2.4

2

Work cooperatively with city of Long Lake to expand Park Ponds

To be determined in feasibility study

 

3.1.1, 3.1.2, 3.1.3

3

Work cooperatively with the DNR and other groups to address erosion and other issues affecting water quality in Wolsfeld Lake

Part of watershed-wide cost-share program

2008 and ongoing

3.1.1, 3.1.3, 3.1.4