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

Mississippi River BridgeAn Analysis of Alternatives

Expert Panel Review

Sharon Greene & Associates


Agenda

Agenda

  • Purpose and Need for New Bridge

  • Existing Conditions

  • Definition of Alternatives

  • Comparison of Alternatives


Purpose of project

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

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

Existing Downtown Crossings

McKinley Bridge

ML King Bridge

Eads Bridge

Poplar Street Bridge


Existing conditions daily crossings

Existing Conditions: Daily Crossings

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


Existing conditions downtown am peak westbound destinations

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

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 type am peak westbound destinations

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 type am peak westbound destinations

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 only west bound destinations

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

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

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

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

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

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

Comparison of Alternatives

  • Congestion Reduction

  • Network Connectivity

  • Travel Time Savings

  • Regional Economic Development Impacts

  • Potential for Revenue Generation


Congestion reduction 2020 traffic volume comparison

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 comparison1

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

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

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

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


Mississippi river bridge an analysis of alternatives

Travel Patterns

MRB: All Connections


Internal external trips analysis new mrb

Internal/External Trips Analysis:New MRB

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


Internal external trips analysis poplar street bridge

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

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

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

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 Between Key Origins and Destinations


Average travel time savings

Average Travel Time Savings

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


Average travel time savings1

Average Travel Time Savings

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


Average travel time savings2

Average Travel Time Savings

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


Average travel time savings3

Average Travel Time Savings

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


Regional economic development impacts

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

Potential Toll Revenue Generation

  • Toll Diversion Rates

  • Assumptions

  • Potential Revenue Generation

  • Potential Funding Scenario


Estimated toll diversion rates travel demand model results

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

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 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 funding scenarios travel demand model results1

Potential Funding Scenarios:Travel Demand Model Results


Potential toll bond revenue generation additional consultant assumption

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


Potential funding scenarios consultant assumptions

Potential Funding Scenarios:Consultant Assumptions


Potential funding scenarios consultant assumptions1

Potential Funding Scenarios:Consultant Assumptions


Questions

Questions?


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