idnr engineering
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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 - PowerPoint PPT PresentationTRANSCRIPT
Heath Delzell – Engineering Bureau
IDNR Engineering
Progress to Date and Timeline for Project CompletionDesign and Construction Obstacles
Construction ActivitiesPhase 1 – Dam and
Spillway RenovationPhase 2 - In-Lake
ConstructionSediment Retention
Basins Sediment RemovalShoreline ArmoringUniversally Accessible
Fishing PierPhase 3 – Boat Ramp
and Parking Lot
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
StatusF-R Design complete and
permitted for constructionFunding has been
securedCurrently out for bids –
Letting date October 21, 2010
Timeline – Phase 1Winter 2010
Early Start Date: December 1, 2010
Portion of dam to be removed
Tree ClearingConcrete Removal
Timeline – Phase 1Spring-Summer 2011
Excavate Core Trench
Construct Principal Spillway Outlet/Drawdown Pipe
Place Embankment Fill
Timeline – Phase 1Summer-Fall 2011
Place Embankment FillConstruct Principal
Spillway InletAuxiliary Spillway
GradingClose Drawdown Pipe
Winter 2011 – No Construction
Spring 2012Final GradingProject Complete: May
31, 2012
Progress – Phase 2Sediment Retention
BasinsUpper Arm Basin
Preliminary DesignDesigned as a
Sediment PondFilled with Dredge
Material1-2 feet deep
State Contract for completionFinish DesignApply For PermitWetland Mitigation Plan
Progress – Phase 2Sediment Retention
BasinsCampground Arm
Design Complete Increasing Dam
HeightSame function as
Upper Arm Basin
Progress – Phase 2Sediment Removal
Design CompleteRemoving sediment via
mechanical meansScrapers, Bulldozers,
Excavators, Etc.Shoreline Armoring
Design CompletePlacing Riprap in
normally inaccessible locations
Universally Accessible Fishing PierDesign 95% Complete
Timeline – Phase 2Winter 2010
Design and permit application complete January 1Wetland mitigation
Spring 2011Bid Letting: March 17,
2011Early Start Date: May 1,
2011Summer-Fall-Winter 2011
ConstructionSpring 2012
Final Grading and SeedingProject Completion: March
15, 2012
Progress – Phase 3Boat Ramp and
Parking LotDesign is 25%
completeSchedule dependant
on Phase 21-2 Months for
construction
Construction ObstaclesRAIN!!!
Dam construction would slowLarge storms can severely erode a partially
constructed damSediment removal would stop
Green Valley <10% complete
Construction ObstaclesPerspective:
Annual Precipitation for Brighton (inches)
1991 / 2008 1992 / 2009 1993 / 2010
44.0”
30.2”
55.3”
40.5”
54.3”
48.4”
ConclusionDam construction
begins in DecemberPhase 2 starts
Spring 2011Boat Ramp starts
Fall 2011 or Spring 2012
All phases should be complete and the lake nearly full by the end of May 2012