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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 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 comparison19
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

slide22

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 savings
Average Travel Time Savings

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

average travel time savings30
Average Travel Time Savings

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

average travel time savings31
Average Travel Time Savings

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

average travel time savings32
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 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%