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Engineering Progress Report for Dam Renovation and Construction Activities

This report outlines the progress of the dam renovation and associated construction activities as of October 2010. It details the phases of the project including the completion status of the dam and spillway renovation, in-lake construction, sediment retention basins, and shoreline armoring. Key milestones from the project history are highlighted, including design approvals and funding. The report also addresses construction obstacles, such as weather impacts, and presents a timeline for future phases. All phases are aimed at completion by May 2012, enhancing the lake's integrity and accessibility.

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Engineering Progress Report for Dam Renovation and Construction Activities

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  1. IDNR Engineering Heath Delzell – Engineering Bureau Progress to Date and Timeline for Project Completion Design and Construction Obstacles

  2. Construction Activities • Phase 1 – Dam and Spillway Renovation • Phase 2 - In-Lake Construction • Sediment Retention Basins • Sediment Removal • Shoreline Armoring • Universally Accessible Fishing Pier • Phase 3 – Boat Ramp and Parking Lot

  3. Progress – Phase 1 • History • 1991 – Voids filled under spillway • 2007 – Contracted French-Reneker Associates to determine cause • 2008 – F-R concluded leak in weathered bedrock • Solution: Remove weathered bedrock • Status • F-R Design complete and permitted for construction • Funding has been secured • Currently out for bids – Letting date October 21, 2010

  4. Timeline – Phase 1 • Winter 2010 • Early Start Date: December 1, 2010 • Portion of dam to be removed • Tree Clearing • Concrete Removal

  5. Timeline – Phase 1 • Spring-Summer 2011 • Excavate Core Trench • Construct Principal Spillway Outlet/Drawdown Pipe • Place Embankment Fill

  6. Timeline – Phase 1 • Summer-Fall 2011 • Place Embankment Fill • Construct Principal Spillway Inlet • Auxiliary Spillway Grading • Close Drawdown Pipe • Winter 2011 – No Construction • Spring 2012 • Final Grading • Project Complete: May 31, 2012

  7. Progress – Phase 2 • Sediment Retention Basins • Upper Arm Basin • Preliminary Design • Designed as a Sediment Pond • Filled with Dredge Material • 1-2 feet deep • State Contract for completion • Finish Design • Apply For Permit • Wetland Mitigation Plan

  8. Progress – Phase 2 • Sediment Retention Basins • Campground Arm • Design Complete • Increasing Dam Height • Same function as Upper Arm Basin

  9. Progress – Phase 2 • Sediment Removal • Design Complete • Removing sediment via mechanical means • Scrapers, Bulldozers, Excavators, Etc. • Shoreline Armoring • Design Complete • Placing Riprap in normally inaccessible locations • Universally Accessible Fishing Pier • Design 95% Complete

  10. Timeline – Phase 2 • Winter 2010 • Design and permit application complete January 1 • Wetland mitigation • Spring 2011 • Bid Letting: March 17, 2011 • Early Start Date: May 1, 2011 • Summer-Fall-Winter 2011 • Construction • Spring 2012 • Final Grading and Seeding • Project Completion: March 15, 2012

  11. Progress – Phase 3 • Boat Ramp and Parking Lot • Design is 25% complete • Schedule dependant on Phase 2 • 1-2 Months for construction

  12. Construction Obstacles • RAIN!!! • Dam construction would slow • Large storms can severely erode a partially constructed dam • Sediment removal would stop • Green Valley <10% complete

  13. Construction Obstacles • Perspective: 55.3” 54.3” 48.4” 44.0” 40.5” Annual Precipitation for Brighton (inches) 30.2” 1991 / 2008 1992 / 2009 1993 / 2010

  14. Conclusion • Dam construction begins in December • Phase 2 starts Spring 2011 • Boat Ramp starts Fall 2011 or Spring 2012 • All phases should be complete and the lake nearly full by the end of May 2012

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