Mississippi river bridge an analysis of alternatives
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Mississippi River Bridge An Analysis of Alternatives. Expert Panel Review. Sharon Greene & Associates. Agenda. Purpose and Need for New Bridge Existing Conditions Definition of Alternatives Comparison of Alternatives. Purpose of Project.

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Mississippi River Bridge An Analysis of Alternatives

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Mississippi River BridgeAn Analysis of Alternatives

Expert Panel Review

Sharon Greene & Associates


Agenda

  • Purpose and Need for New Bridge

  • Existing Conditions

  • Definition of Alternatives

  • Comparison of Alternatives


Purpose of Project

“The purpose of the proposed action is to relieve increasingly severe traffic congestion and reduce traffic crashes on downtown St. Louis-area Mississippi River crossings, especially on the Poplar Street Bridge (I-55/70/64), thereby avoiding economic stagnation at the core of the region.”

Source: Mississippi River Crossing: Relocated I-70 and I-64 Connector, Final Environmental Impact Statement, March 2001.


Need for Project

  • Improve travel capacity and travel efficiency

  • Improve system linkages and community access

  • Reduce traffic crashes

  • Reduce travel times

  • Avoid economic stagnation

Source: Mississippi River Crossing: Relocated I-70 and I-64 Connector, Final Environmental Impact Statement, March 2001.


Existing Downtown Crossings

McKinley Bridge

ML King Bridge

Eads Bridge

Poplar Street Bridge


Existing Conditions: Daily Crossings

Source: Mississippi River Crossings: Average Daily Traffic History, Illinois Department of Transportation.


Existing Conditions:Downtown AM Peak Westbound Destinations

3,877 (35%)

1,762 (16%)

10,964 TotalPeak Hour Trips

CBD

I-70

Mississippi River

3,847 (35%)

I-64

I-55

Source: Mississippi River Crossings: Overview of Travel Patterns, East-West Council of Governments, September 2005.

N

1,478 (13%)


Existing Conditions:Poplar AM Peak Westbound Destinations

979 (14%)

CBD

463 (7%)

6,767 TotalPeak Hour Trips

I-70

Mississippi River

3,847 (57%)

I-64

Poplar

I-55

Source: Mississippi River Crossings: Overview of Travel Patterns, East-West Council of Governments, September 2005.

N

1,478 (22%)


Existing Conditions:All Downtown Crossings by Vehicle TypeAM Peak, Westbound Destinations

Source: Special Traffic Counts, East-West Council of Governments, December 2006.


Existing Conditions:Poplar Street Crossings by Vehicle TypeAM Peak, Westbound Destinations

Source: Mississippi River Crossings: Overview of Travel Patterns, East-West Council of Governments, September 2005.


Existing Conditions:Poplar Street Crossings by Vehicle Type: Off-Peak OnlyWest bound Destinations

Source: Mississippi River Crossings: Overview of Travel Patterns, East-West Council of Governments, September 2005.


Alternatives Under Consideration

McKinley Bridge

Proposed IL-3

Proposed MRB

Proposed I-64

Proposed Coupler Bridge

ML King Bridge

Eads Bridge

Poplar Street Bridge


MRB: No Connections

  • Landside Improvements: None

  • Capital Cost Estimate: $999.2M (YOE)

  • Proposed Schedule: 2009-2014

  • NEPA Status: ROD proposed 2007

  • Potential Committed Funding:

    • SAFETEA-LU Earmarks: $239M

    • Additional IDOT Funding: $210M

  • Tolling Considered: Yes

Proposed MRB


MRB: With I-64 Connector

  • Landside Improvements: I-64 Connection

  • Capital Cost Estimate: $1,561.5M (YOE)

  • Proposed Schedule: 2009-2014

  • NEPA Status: ROD proposed 2007

  • Potential Committed Funding:

    • SAFETEA-LU Earmarks: $239M

    • Additional IDOT Funding: $210M

  • Tolling Considered: Yes

Proposed MRB

Proposed I-64


MRB: With I-64 and IL-3 Connections

  • Landside Improvements: I-64 Connection and IL-3 Connection

  • Capital Cost Estimate: $1,762.5M (YOE)

  • Proposed Schedule:2009-2014

  • NEPA Status:ROD proposed 2007

  • Potential Committed Funding:

    • SAFETEA-LU Earmarks: $239M

    • Additional IDOT Funding: $210M

  • Tolling Considered: Yes

Proposed IL-3

Proposed MRB

Proposed I-64


MLK Coupler Bridge

  • Landside Improvements: None

  • Capital Cost Estimate: $545.9M (YOE)

  • Proposed Schedule: 2012-2014

  • NEPA Status: Not Analyzed

  • Potential Committed Funding:

    • SAFETEA-LU Earmarks: $239M

    • Additional IDOT Funding: $210M

  • Tolling Considered: No

Proposed Coupler Bridge


Comparison of Alternatives

  • Congestion Reduction

  • Network Connectivity

  • Travel Time Savings

  • Regional Economic Development Impacts

  • Potential for Revenue Generation


Congestion Reduction:2020 Traffic Volume Comparison

391,378

392,079

391,828

391,232

391,346

391,254

391,220

381,755

371,705

246,400

246,248

242,625

234,238

233,609

230,861

230,135

232,368

214,358

Source: East-West Gateway Council of Government Travel Demand Model Run


Congestion Reduction:2020 Traffic Volume Comparison

Source: East-West Gateway Council of Government Travel Demand Model Run


Congestion Reduction:2020 AM Westbound Volume to Capacity (V/C) Ratio

Source: East-West Gateway Council of Government Travel Demand Model Run


Congestion Reduction:2020 PM Eastbound Volume to Capacity (V/C) Ratio

Source: East-West Gateway Council of Government Travel Demand Model Run


Travel Patterns

MRB: All Connections


Internal/External Trips Analysis:New MRB

Source: East-West Gateway Council of Government Travel Demand Model Run


Internal/External Trips Analysis:Poplar Street Bridge

Source: East-West Gateway Council of Government Travel Demand Model Run


Internal/External Trips Analysis:Change on Poplar Street Bridge

Source: East-West Gateway Council of Government Travel Demand Model Run


Annual Travel Time Savings:All Bridges

Source: East-West Gateway Council of Government Travel Demand Model Run


Average Travel Time for AM Westbound Trips:Poplar, New MRB, and MLK Bridges

Source: East-West Gateway Council of Government Travel Demand Model Run


Average Travel Time Between Key Origins and Destinations


Average Travel Time Savings

Source: East-West Gateway Council of Government Travel Demand Model Run


Average Travel Time Savings

Source: East-West Gateway Council of Government Travel Demand Model Run


Average Travel Time Savings

Source: East-West Gateway Council of Government Travel Demand Model Run


Average Travel Time Savings

Source: East-West Gateway Council of Government Travel Demand Model Run


Regional Economic Development Impacts

  • Little definitive data is available

  • Business community forecasts show positive impacts in qualitative terms

  • Changes in the rate of growth and traffic within the region over the last 10 years raises issues related to economic growth:

    • Will a new bridge spur new net growth, and hence contribute positively to the region’s economy?

    • Will the absence of a new bridge hinder potential growth with an inherent negative impacts on the region’s economy?


Potential Toll Revenue Generation

  • Toll Diversion Rates

  • Assumptions

  • Potential Revenue Generation

  • Potential Funding Scenario


Estimated Toll Diversion Rates:Travel Demand Model Results

Source: East-West Gateway Council of Government Travel Demand Model Run


Potential Toll Bond Revenue Generation: Assumptions

  • Weekend traffic levels: 0.5 * weekday levels

  • Annualization Factors

    • Weekday: 250

    • Weekend: 115

  • Toll Rate Scenarios:

    • $1 Auto / $3 Truck

    • $2 Auto / $4 Truck

  • Annual O&M Cost:10% of Annual Toll Revenue

  • Debt Coverage Level: 1.4

  • Bond Amortization: 30 years @ 5.75%


Potential Toll Bond Revenue Generation Estimate:Travel Demand Model Results (in millions)


Potential Funding Scenarios:Travel Demand Model Results


Potential Funding Scenarios:Travel Demand Model Results


Potential Toll Bond Revenue Generation: Additional Consultant Assumption

  • $1 Auto / $3 Truck Diversion Rate = 50%

  • $2 Auto / $4 Truck Diversion Rate = 70%


Potential Toll Bond Revenue Generation Estimate:Consultant Assumption (in millions)


Potential Funding Scenarios:Consultant Assumptions


Potential Funding Scenarios:Consultant Assumptions


Questions?


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