Crosby Lake Management Plan Monitoring/Assessment Activities………………4-26

Crosby Lake Management Plan Monitoring/Assessment Activities………………4-26

Table of Contents 1.0 INTRODUCTION ........................................................................................................... 1-1 1.1 Purpose ................................................................................................................. 1-1 1.2 The Strategic Planning Process ............................................................................ 1-1 1.2.1 Technical Advisory Group .................................................................... 1-2 1.2.2 Citizen Advisory Group ........................................................................ 1-2 2.0 WATERSHED AND LAKE CHARACTERIZATION ............................................... 2-1 2.1 Watershed Description ......................................................................................... 2-1 2.1.1 Land Use ................................................................................................ 2-1 2.1.2 Soils ....................................................................................................... 2-5 2.1.3 Watershed Water Quality ...................................................................... 2-5 2.2 Crosby Lake ......................................................................................................... 2-7 2.2.1 Crosby Farm Park .................................................................................. 2-7 2.2.2 Hydrogeology and Surrounding Land Use ............................................ 2-8 2.2.3 Geomorphometry ................................................................................... 2-9 2.2.4 Shallow Lake Ecology ......................................................................... 2-11 2.2.5 Mississippi River Interaction ............................................................... 2-13 2.2.6 Crosby Lake Water Quality ................................................................. 2-14 2.2.7 Fisheries ............................................................................................... 2-18 2.2.8 Aquatic Vegetation .............................................................................. 2-18 2.3 Crosby Lake Response Model ........................................................................... 2-21 3.0 IDENTIFICATION OF ISSUES AND GOALS ........................................................... 3-1 3.1 Goal Identification ............................................................................................... 3-1 3.2 Stakeholder Priorities ........................................................................................... 3-1 3.2.1 Citizen Advisory Group Priority Issues ................................................ 3-1 3.3 POTENTIAL Water Quality Goals for Crosby Lake .......................................... 3-3 3.4 POTENTIAL water quality goals for Direct River Discharge ............................ 3-3 3.5 Selected water quality goals................................................................................. 3-4 3.6 Adaptive Management ......................................................................................... 3-5 4.0 IMPLEMENTATION PLAN ......................................................................................... 4-1 4.1 Management Activity Selection ........................................................................... 4-1 4.2 Citizen Input on Solutions ................................................................................... 4-1 4.3 Direct River Drainage .......................................................................................... 4-4 4.3.1 35E Regional Stormwater Pond ............................................................ 4-4 th 4.3.2 Infiltration Basin Expansion along 7 Street......................................... 4-4 i 4.3.3 Highland Ravine Stabilization/Restoration Project ............................... 4-4 4.3.3.1 Highland Creek Bank Stabilization - Site 1 ........................... 4-5 4.3.3.2 Highland Creek Bank Stabilization - Site 2 ........................... 4-5 4.3.4 Stream Corridor Restoration Feasibility Study for Highland Creek ..... 4-5 4.3.5 Griggs / Scheffer Residential Street Vitality Program .......................... 4-5 4.3.6 Implement Rain Gardens throughout the Watershed ............................ 4-6 4.3.7 Saint Paul Parking Lot Reconstruction West of Crosby Lake .............. 4-6 4.3.8 Sump Manholes and Grit Chambers ...................................................... 4-7 4.3.9 Street Sweeping ..................................................................................... 4-7 4.3.10 Golf Course Stormwater and Fertilizer Management ........................... 4-7 4.3.11 Monitoring ............................................................................................. 4-7 4.4 Crosby Lake Watershed ....................................................................................... 4-7 4.4.1 Madison / Benson Residential Street Vitality Program ......................... 4-8 4.4.2 Stormwater Diversion along Shepard Road .......................................... 4-8 4.4.3 Saint Paul Parking Lot East of Crosby Lake ....................................... 4-10 4.4.4 Management of Natural Areas ............................................................. 4-10 4.4.5 Manage Trash along the Bluff and in Crosby Farm Regional Park .... 4-11 4.4.6 Crosby Farm Park and Hidden Falls Park - Prairie and Woodland Restoration .......................................................................................... 4-11 4.4.7 Gorge Leadership Team ...................................................................... 4-11 4.4.8 Bluff Stabilization ............................................................................... 4-11 4.5 Eliminated Projects ............................................................................................ 4-11 4.5.1 Expansion of Depression west of 35E and South of Shepard Road .... 4-12 4.5.2 Infiltration Basin at the NE Corner of Elway and Shepard ................. 4-12 4.5.3 Storm Sewer Diversion to Underground Infiltration ........................... 4-12 4.5.4 Shepard Road Green Infrastructure Practices East of Interstate 35E .. 4-12 4.6 In-Lake Management ......................................................................................... 4-12 4.6.1 Assess and Manage Filamentous Algae .............................................. 4-12 4.6.2 Integrated Carp Management .............................................................. 4-13 4.6.3 Curly-leaf Pondweed Control .............................................................. 4-13 4.6.4 Shoreline Restoration .......................................................................... 4-13 4.6.5 Crosby (Upper) Lakeshore Restoration ............................................... 4-14 4.6.6 Water Quality Monitoring ................................................................... 4-14 4.6.7 Install Nesting Boxes ........................................................................... 4-14 4.6.8 Fish Monitoring ................................................................................... 4-14 4.6.9 Shallow Lake Habitat Assessment ...................................................... 4-14 4.6.10 Evaluate an Index of Biotic Integrity for Crosby Lake ....................... 4-14 4.7 Education and Outreach ..................................................................................... 4-15 4.8 Implementation Plan Costs ................................................................................ 4-15 4.8.1 Watershed Projects .............................................................................. 4-15 4.8.2 In-lake Management ............................................................................ 4-23 4.9 Implementation Schedule ................................................................................... 4-25 5.0 REFERENCES ................................................................................................................ 5-1 ii 6.0 GLOSSARY ..................................................................................................................... 6-1 TABLES Table 2-1. Land Use in the Crosby Subwatershed ....................................................................... 2-1 Table 2-2. Average Annual Flow, TSS and TP for the Crosby Subwatershed and Crosby Lake Subwatershed from 2000 through 2009 ....................................................................................... 2-5 Table 2-3. Physical Characteristics of Crosby Lake .................................................................... 2-9 Table 3-1. Minnesota Water Quality Targets for the Mississippi and Minnesota Rivers............ 3-4 Table 4-1. Potential Capital Improvement Projects in the Crosby Subwatershed (Drains to River) .................................................................................................................................. 4-17 Table 4-2. Potential Studies and Monitoring for the Crosby Subwatershed .............................. 4-20 Table 4-3. Potential Capital Improvement Projects in the Crosby Lake Subwatershed (Drains to Lake) ........................................................................................................................ 4-21 Table 4-4. Estimated Total Phosphorus Loading and Load Reductions from BMPs for Each Subwatershed ........................................................................................................... 4-22 Table 4-5. Estimated Total Suspended Solids Loading and Load Reductions

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