2020 Valley Branch Watershed District Infrastructure and Conveyance Systems Inspections Prepared for Valley Branch Watershed District Board of Managers December 2020 4300 MarketPointe Drive Minneapolis, MN 55435 Phone: 952.832.2600 Fax: 952.832.2601 2020 Valley Branch Watershed District Infrastructure and Conveyance Systems Inspections December 2020 Contents List of Tables ........................................................................................................................................................................................... ii List of Figures ......................................................................................................................................................................................... ii List of Appendices ................................................................................................................................................................................ ii Certifications.......................................................................................................................................................................................... iii 1.0 Executive Summary ............................................................................................................................................................. 1 2.0 Systems Inspections ............................................................................................................................................................ 3 2.1 Project 1007 ...................................................................................................................................................................... 3 2.2 Echo Lake Outlet ............................................................................................................................................................. 5 2.3 Weber Pond Outlet ........................................................................................................................................................ 5 2.4 Silver Lake Spent-Lime Filter ...................................................................................................................................... 5 2.5 Silver Lake Bioretention Basin .................................................................................................................................... 6 2.6 Silver Lake Outlet ............................................................................................................................................................ 8 2.7 Long Lake Ravine Stabilization Project .................................................................................................................. 9 2.8 DeMontreville Ravine Stabilization Project .......................................................................................................... 9 2.9 Olson Lake Estates Pond Outlet Project ..............................................................................................................12 2.10 Raleigh Creek..................................................................................................................................................................13 2.11 Raleigh Creek Bank Stabilization Project .............................................................................................................15 2.12 Farney Creek Stabilization Project..........................................................................................................................17 2.13 Goetschel Pond Ravine Stabilization Project .....................................................................................................18 2.14 Sunfish Lake Ravines ...................................................................................................................................................19 2.15 Goose Lake Ravine Stabilization Project ..............................................................................................................19 2.16 Downs Lake Flood Duration Reduction Project ................................................................................................20 2.17 Valley Creek.....................................................................................................................................................................21 2.18 Oakgreen Avenue Infiltration Basin .......................................................................................................................23 2.19 Valley Creek Ravine Stabilization Projects—Landucci and Moynagh Ravines .....................................23 2.20 Blasko Dam Removal Project ...................................................................................................................................24 2.21 Valley Creek Upstream Stabilization Project ......................................................................................................24 2.22 Valley Creek Downstream Stabilization Project ................................................................................................25 2.23 30th and Trading Post Ravine Stabilization Project .........................................................................................28 2.24 Kelle’s Creek ....................................................................................................................................................................30 2.25 Swede Hill Creek Subwatershed .............................................................................................................................30 2.26 Cost-Share Projects with More Than $5,000 in VBWD Contribution .......................................................37 3.0 Non-System Specific Activities .....................................................................................................................................39 P:\Mpls\23 MN\82\2382016\_MovedFromMpls_P\VBWD\2382016\MEETINGS\2020\121020\ForDeb\Inspection and Maintenance Report\2020 Inspection Report_v2.docx i 3.1 Web Mapping ................................................................................................................................................................39 3.2 Web-Based Permit Inspection Reporting ............................................................................................................39 3.3 Beaver-Removal Cost-Share Program ..................................................................................................................40 3.4 General Maintenance ..................................................................................................................................................40 3.5 Locating Services ..........................................................................................................................................................40 3.6 2020 Flood Mitigation and Coordination Efforts .............................................................................................41 4.0 Maintenance and Operation Work Performed in 2020 ......................................................................................42 5.0 Recommendations ............................................................................................................................................................46 5.1 Inspections ......................................................................................................................................................................46 5.2 Operations and Maintenance Items ......................................................................................................................47 5.3 Maintenance Costs .......................................................................................................................................................49 List of Tables Table 2-1 Prioritized Significant Erosion Locations for Valley Creek ............................................................... 22 Table 2-2 Cost-Share Projects Receiving More than $5,000 in VBWD Contributions .............................. 37 Table 5-1 2021 Recommended Inspection Activities ............................................................................................. 46 Table 5-2 Recommended Operations and Maintenance Activities Based on 2020 Inspections .......... 47 Table 5-3 Summary of Maintenance Costs ................................................................................................................ 49 List of Figures Figure 1-1 Infrastructure and Conveyance Systems .................................................................................................... 2 Figure 5-1 Maintenance Recommendations ............................................................................................................... 50 List of Appendices Appendix A 2020 Eagle Point Lake Dam Inspection Report Appendix B 2020 Rest Area Pond Dam Inspection Report ii Certifications I hereby certify that this report was prepared by me or under my direct supervision and that I am a duly Licensed Professional Engineer under the Laws of the State of Minnesota. December 3, 2020 John P. Hanson Date PE #: 24678 iii 1.0 Executive Summary The Valley Branch Watershed District (VBWD) owns, operates, and/or maintains a number of infrastructure and conveyance systems throughout the VBWD, including streams, storm sewer pipes, manholes, catch basins, water level control structures, infiltration basins, bank stabilizations, and dams.