1 Southwest Arterial Southwest Arterial DMATS Presentation Project Status Update Robert Schiesl Assistant City Engineer PURPOSE OF MEETING Review current project status Inform you of the results and recommendations of the preliminary design VE evaluations Inform you of the proposed design modifications Project schedule Project schedule Receive your input and comments
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Southwest Arterial DMATS Presentation Project Status Update
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Southwest ArterialSouthwest ArterialDMATS Presentation Project Status Update
Robert Schiesl Assistant City Engineer
PURPOSE OF MEETING
Review current project statusInform you of the results and recommendations of the preliminary design VE evaluationsInform you of the proposed design modificationsProject scheduleProject scheduleReceive your input and comments
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Southwest Arterial Project
PROJECT PARTNERSHIPThe #1 Surface Transportation Priority in the Dubuque Area For:
Dubuque City Council
Dubuque County Board of Supervisors
Dubuque Metropolitan Area Transportation Study (DMATS)
Greater Dubuque Development Corporation
Dubuque Area Chamber of Commerce
Continuing to move forward with the development of the Southwest Arterial
• Connects U.S. Hwy 20 with U.S. Hwy 61/151
Southwest Arterial ProjectProject Development
• 4-lane Divided Freeway (6.1 Miles)
• Priority 1 Access Control
• Three InterchangesH 20 H 61/151 N C d R dHwy 20, Hwy 61/151, N. Cascade Road
• Full Build Cost Estimate $125 Million
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Southwest Arterial ProjectCorridor Alignment Map
NEPA Clearance - Completed 2004
Preliminary Engineering Design - Completed 2008
Southwest Arterial ProjectWhere Are We Today?
Preliminary Engineering Design Completed 2008
• Final Engineering DesignUnderway
• Right-of-Way Property AcquisitionUnderway
• Archaeological & Cultural Resource MitigationUnderway
• ConstructionUnder Contract - N. Cascade Reconstruction
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• Value Engineering Study - Completed December, 2009
Southwest Arterial ProjectValue Engineering (VE) Study
Preliminary Design Evaluation & Recommendations
g g y p ,Identify potential modifications that might decrease construction costIncrease the value of the project
• Preliminary VE design evaluation - Completed November, 2010
• 10 - Initial VE Alternatives were evaluated
7 - VE Concepts Recommended For Further Consideration
Potential total estimated VE savings: $7,500,000
3 - VE Concepts Not Recommended
• Most significant VE recommendations are the proposed modifications to the SW Arterial / U.S. 20 / Seippel Road interchange area. Potential savings $6,200,000
OriginalUS 20 Interchange
Cross OverCross Over Bridge
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US 20 Interchange - Concept ANot Recommended
• Folded diamond with loop ramps
• Eliminate Cross Over Bridge over US20
Evaluated
Bridge over US20
• Wetland Impacts
• Exit Loop RampSpeed DecelerationBottom of HillSafety Concern
• VE AlternativeEliminate interchangeEliminate interchangeNo at-grade intersectionsPriority 1 access control
N. Cascade Road / English Mill Interchange Layout
Design Revisions
• Diamond interchange
• Use roundabout intersections
• Eliminate loop rampEliminate loop ramp
• Reduce property impacts by approx. 9 acres
• Reduce project cost by approx. $240,000
• VE AlternativeEliminate interchangeEliminate interchangeNo at-grade intersectionsPriority 1 access control
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N. Cascade Road / English Mill Interchange Layout
Design Revisions
• Diamond interchange
• Use roundabout intersections
• Eliminate loop rampEliminate loop ramp
• Reduce property impacts by approx. 9 acres
• Reduce project cost by approx. $240,000
• VE AlternativeEliminate interchangeEliminate interchangeNo at-grade intersectionsPriority 1 access control
N. Cascade Road / English Mill Interchange Layout
Design Revisions
• Diamond interchange
• Use roundabout intersections
• Eliminate loop rampEliminate loop ramp
• Reduce property impacts by approx. 9 acres
• Reduce project cost by approx. $240,000
• VE AlternativeEliminate interchangeEliminate interchangeNo at-grade intersectionsPriority 1 access control
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N. Cascade Road / English Mill Interchange Layout
• Diamond interchange
• Use roundabout intersections
• Eliminate loop ramp
Design Revisions
Eliminate loop ramp
• Reduce property impacts by approx. 9 acres
• Reduce project cost by approx. $240,000
• VE AlternativeEliminate interchangeEliminate interchangeNo at-grade intersectionsPriority 1 access control
• Eliminate retaining walls
• Provide landscaped cut slopes on both sides of Southwest Arterial
Military Road Area Revisions
• Requires additional property acquisition
• Reduce project cost by approx. $2 Million
• Added bike / pedestrian trail between Military Road and US 151 / 61
Original Tiered Wall Concept
• VE AlternativeConstruct tunnelCost prohibitive
Landscaped SlopesRecommended
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• Folded diamond with loop ramps
• Use roundabout intersections
Design Revisions
• Eliminate 2 bridges on ramps, switch to box culvert
• Added bike / pedestrian trail through interchangeto Old Davenport Road
• Reduce project cost
US 151 / 61Interchange Layout
by approx. $400,000
• Folded diamond with loop ramps
• Use roundabout intersections
Design Revisions
• Eliminate 2 bridges on ramps, switch to box culvert
• Added bike / pedestrian trail through interchangeto Old Davenport Road
• Reduce project cost
US 151 / 61Interchange Layout
by approx. $400,000
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Design Revisions
• Folded diamond with loop ramps
• Use roundabout intersections
• Eliminate 2 bridges on ramps, switch to box culvert
• Added bike / pedestrian trail through interchangeto Old Davenport Road
• Reduce project cost
US 151 / 61Interchange Layout
by approx. $400,000
Roundabouts move traffic safely & efficiently:
• Slower speeds• Fewer conflict points• Easy decision making
Roundabouts provide:
• 90% reduction in fatal crashes• 76% reduction in injury crashes• 30-40% reduction in pedestrian crashes• 10% reduction in bicycle crashes• No traffic signal costs• Environmental benefits
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Southwest Arterial Project Schedule
• N. Cascade Road Grading - Stage 1 Oct - Nov 2010• N. Cascade Road Grading - Stage 2 July 2011 - Sept 2011• N. Cascade Road Bridge March 2011 - July 2011• English Mill Road Utility Relocation Summer 2011• E li h Mill R d G di & B id J l 2011 N 2011
Project Schedule
• English Mill Road Grading & Bridge July 2011 - Nov 2011• Military Road Grading & Bridge Summer 2012 **• SW Arterial Grading, 4-Lane To be Determined **• SW Arterial Paving, 2-Lane To be Determined **
** Schedules are subject to change, based on funding availability