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

• Entry Loop RampSlow Entry SpeedSlow Entry SpeedMerging TrafficSafety Concern


Evaluated


• Eliminate Cross Over Bridge over US20Bridge over US20

• Wetland Impacts



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Evaluated



• Wetland Impacts




Evaluated



• Wetland Impacts



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US 20 Interchange - Concept CNot Recommended

• Mixed configuration: Standard diamond with a folder diamond / loop ramp

• Eliminate Cross Over

Evaluated

• Eliminate Cross Over Bridge over US20

• Avoids Environmental Impacts

• Entry Loop RampLower Entry SpeedMerging TrafficSafety Concern

US 20 Interchange - Concept CNot Recommended

Evaluated

• Mixed configuration: Standard diamond with a folder diamond / loop ramp

• Eliminate Cross Over• Eliminate Cross Over Bridge over US20

• Avoids Environmental Impacts

• Entry Loop RampLower Entry SpeedMerging TrafficSafety Concern

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US 20 Interchange - Concept BRecommended

OriginalUS 20 Interchange

Cross OverCross Over Bridge

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• Change to standard “diamond interchange” configuration

• Simple, safe interchange

Design Revisions

• Eliminate loop ramps

• Eliminate crossover bridge over US 20

• US20 Entry RampsHigher entry speedsImprove Merge Traffic

• US20 Exit RampsLess Deceleration

• Use roundabout intersections

• Reduce environmental and property impacts

• Reduce project cost by approx. $6.2 million




Design Revisions



• US20 Entry RampsHigher entry speedsImprove Merge Traffic

• US20 Exit RampsLess Deceleration




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Design Revisions



• US20 Entry RampsHigher entry speedsImprove merge traffic

• US20 Exit RampsLess decelerationImproved safety







Design Revisions



• US20 Entry RampsHigher entry speedsImprove merge traffic

• US20 Exit RampsLess decelerationImproved safety




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N. Cascade Road / English Mill Interchange Layout

Design Revisions

• Diamond interchange


• 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


Design Revisions







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Design Revisions








Design Revisions







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• Eliminate loop ramp

Design Revisions

Eliminate loop ramp




• 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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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



Design Revisions





by approx. $400,000

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Design Revisions







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

Southwest Arterial ProjectSide Road Improvement Projects

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North Cascade RoadUnder Construction

North Cascade RoadUnder Construction

N. Cascade Bridge

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North Cascade Road BridgeArchitectural Rendering

Summer 2011


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Funding Summary


Appropriations Amount

Federal Funding $ 32,805,334 *

* After SAFETEA-LU obligation limitations applied** State funding programmed in FY2013 / 2014

State Funding $ 17,760,000 **City / County Funding $ 15,808,967

Total Federal / State / Local Funding: $ 66,374,301

FY 2009 - 2010 $ 21,923,942

FY 2011 $ 6,057,500

Total Expenditure Obligation: $ 27,981,442

Expenditure Obligation Summary

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Property Acquisition (4-Lane, Hwy 20 - Hwy 61/151) $ 9.8 Million

Iowa DOT - Land Acquisition Services $ 330 000

Southwest Arterial ProjectInterim Build Alternative

Pave 2-Lane Highway (Hwy 20 to Hwy 61/151)

Iowa DOT Land Acquisition Services $ 330,000

Final Engineering Design $ 8 Million

Mitigation $ 2 Million

Construction $ 78.2 Million

• Grading (4-Lane, Hwy 61/151 - Hwy 20)

• Pave 2-Lanes (Hwy 20 - Hwy 61/151)

• Partial Interchange (Hwy 20)• Partial Interchange (Hwy 20)

• Partial Interchange (Hwy 61/151)

• Temp At-Grade Intersection (N. Cascade)

Interim Build Cost Estimate: $ 98.3 Million

Project Cost

Interim Build Cost Estimate $ 98.3 Million


• 2-Lane Highway

• Hwy 20 to Hwy 61/151

Federal Funding $ 32.8 Million

State Funding $ 17.8 Million

Local Funding $ 15.8 Million

Funding Gap $ 32 Million

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S th t A t i l

Questions?

Southwest Arterial Project Status Update

Southwest Arterial DMATS Presentation Project Status Update

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