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IDNR Engineering

IDNR Engineering. Heath Delzell – Engineering Bureau. Progress to Date and Timeline for Project Completion Design and Construction Obstacles. Construction Activities. Phase 1 – Dam and Spillway Renovation Phase 2 - In-Lake Construction Sediment Retention Basins Sediment Removal

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IDNR Engineering

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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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