southwest arterial dmats presentation project status update
Post on 04-Oct-2021
1 Views
Preview:
TRANSCRIPT
1
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
2
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
3
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
4
• 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
5
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
US 20 Interchange - Concept ANot Recommended
Evaluated
• Folded diamond with loop ramps
• Eliminate Cross Over Bridge over US20Bridge over US20
• Wetland Impacts
• Exit Loop RampSpeed DecelerationBottom of HillSafety Concern
• Entry Loop RampSlow Entry SpeedSlow Entry SpeedMerging TrafficSafety Concern
6
US 20 Interchange - Concept ANot Recommended
Evaluated
• Folded diamond with loop ramps
• Eliminate Cross Over Bridge over US20Bridge over US20
• Wetland Impacts
• Exit Loop RampSpeed DecelerationBottom of HillSafety Concern
• Entry Loop RampSlow Entry SpeedSlow Entry SpeedMerging TrafficSafety Concern
US 20 Interchange - Concept ANot Recommended
Evaluated
• Folded diamond with loop ramps
• Eliminate Cross Over Bridge over US20Bridge over US20
• Wetland Impacts
• Exit Loop RampSpeed DecelerationBottom of HillSafety Concern
• Entry Loop RampSlow Entry SpeedSlow Entry SpeedMerging TrafficSafety Concern
7
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
8
US 20 Interchange - Concept BRecommended
OriginalUS 20 Interchange
Cross OverCross Over Bridge
9
US 20 Interchange - Concept BRecommended
• 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
US 20 Interchange - Concept BRecommended
• 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
10
US 20 Interchange - Concept BRecommended
• 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 decelerationImproved safety
• Use roundabout intersections
• Reduce environmental and property impacts
• Reduce project cost by approx. $6.2 million
US 20 Interchange - Concept BRecommended
• 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 decelerationImproved safety
• Use roundabout intersections
• Reduce environmental and property impacts
• Reduce project cost by approx. $6.2 million
11
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
12
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
13
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
14
• 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
15
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
16
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
17
North Cascade RoadUnder Construction
North Cascade RoadUnder Construction
N. Cascade Bridge
18
North Cascade Road BridgeArchitectural Rendering
Summer 2011
North Cascade Road BridgeArchitectural Rendering
19
North Cascade Road BridgeArchitectural Rendering
Funding Summary
Southwest Arterial Project
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
20
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
Southwest Arterial Project
• 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
21
S th t A t i l
Questions?
Southwest Arterial Project Status Update
top related