1
Mississippi River Bridge
An Analysis of Alternatives
Mississippi River Bridge
An Analysis of AlternativesExpert Panel ReviewExpert Panel Review
Sharon Greene & Associates
Sharon Greene & Associates
AgendaAgenda
●Purpose and Need for New Bridge●Existing Conditions●Definition of Alternatives●Comparison of Alternatives
Sharon Greene & Associates
Purpose of ProjectPurpose 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.
Sharon Greene & Associates
Need for ProjectNeed 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.
Sharon Greene & Associates
Existing Downtown CrossingsExisting Downtown Crossings
McKinley Bridge
ML King Bridge
Eads Bridge
Poplar Street Bridge
Sharon Greene & Associates
Existing Conditions: Daily CrossingsExisting Conditions: Daily Crossings
0
50,000
100,000
150,000
200,000
250,000
300,000
Poplar Eads MLKMcKinley I-255 I-270
US 67 Downtown Total Overal Total
Source: Mississippi River Crossings: Average Daily Traffic History, Illinois Department of Transportation.
Sharon Greene & Associates
Existing Conditions:Downtown AM Peak Westbound Destinations
Existing Conditions:Downtown AM Peak Westbound Destinations
I-64
CBD
I-70
I-55
10,964 TotalPeak Hour Trips
10,964 TotalPeak Hour Trips
3,847 (35%)3,847 (35%)
1,478 (13%)1,478 (13%)
3,877 (35%)3,877 (35%)
Source: Mississippi River Crossings: Overview of Travel Patterns, East-West Council of Governments, September 2005.
1,762 (16%)1,762 (16%)
N
Mis
siss
ipp
i Riv
er
Sharon Greene & Associates
Existing Conditions:Poplar AM Peak Westbound DestinationsExisting Conditions:Poplar AM Peak Westbound Destinations
I-64
CBD
I-70
I-55
6,767 TotalPeak Hour Trips
6,767 TotalPeak Hour Trips
3,847 (57%)3,847 (57%)
1,478 (22%)1,478 (22%)
979 (14%)979 (14%)
Source: Mississippi River Crossings: Overview of Travel Patterns, East-West Council of Governments, September 2005.
463 (7%)463 (7%)
N
Mis
siss
ipp
i Riv
er
Poplar
Sharon Greene & Associates
Existing Conditions:All Downtown Crossings by Vehicle TypeAM Peak, Westbound Destinations
Existing Conditions:All Downtown Crossings by Vehicle TypeAM Peak, Westbound Destinations
MovementPassenger Vehicles
Heavy Trucks
I-64 99% 1%
I-55/I-44 88% 12%
I-70 90% 10%
Downtown 98% 2%
Total 96% 4%
Source: Special Traffic Counts, East-West Council of Governments, December 2006.
Sharon Greene & Associates
Existing Conditions:Poplar Street Crossings by Vehicle TypeAM Peak, Westbound Destinations
Existing Conditions:Poplar Street Crossings by Vehicle TypeAM Peak, Westbound Destinations
MovementPassenger Vehicles
Heavy Trucks
I-64 99% 1%
I-55/I-44 88% 12%
I-70 79% 21%
Downtown 94% 6%
Total 95% 5%
Source: Mississippi River Crossings: Overview of Travel Patterns, East-West Council of Governments, September 2005.
Sharon Greene & Associates
Existing Conditions:Poplar Street Crossings by Vehicle Type: Off-Peak OnlyWest bound Destinations
Existing Conditions:Poplar Street Crossings by Vehicle Type: Off-Peak OnlyWest bound Destinations
MovementPassenger Vehicles
Heavy Trucks
I-64 94% 6%
I-55/I-44 70% 30%
I-70 67% 33%
Downtown 97% 3%
Total 82% 18%
Source: Mississippi River Crossings: Overview of Travel Patterns, East-West Council of Governments, September 2005.
Sharon Greene & Associates
Alternatives Under ConsiderationAlternatives Under Consideration
McKinley Bridge
ML King Bridge
Eads Bridge
Poplar Street Bridge
Proposed MRB
Proposed Coupler Bridge
Proposed IL-3
Proposed I-64
Sharon Greene & Associates
MRB: No ConnectionsMRB: 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
Sharon Greene & Associates
MRB: With I-64 ConnectorMRB: 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
Sharon Greene & Associates
MRB: With I-64 and IL-3 ConnectionsMRB: 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 MRB
Proposed I-64
Proposed IL-3
Sharon Greene & Associates
MLK Coupler BridgeMLK 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
Sharon Greene & Associates
Comparison of AlternativesComparison of Alternatives
●Congestion Reduction●Network Connectivity●Travel Time Savings●Regional Economic Development
Impacts ●Potential for Revenue Generation
Sharon Greene & Associates
2020 Average Daily Traffic by Alternative : Downtown Bridges and All Bridges
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
No Build M LK Coupler M RB, AllConnections - No
Toll
M RB, I-64Connection - No
Toll
M RB, NoConnections - No
Toll
M RB, AllConnections - $1Auto / $3 Truck
M RB, I-64Connection - $1Auto / $3 Truck
M RB, NoConnections - $1Auto / $3 Truck
M RB, AllConnections - $2Auto / $4 Truck
Downtown Bridges All Bridges
Congestion Reduction:2020 Traffic Volume ComparisonCongestion Reduction:2020 Traffic Volume Comparison
214,358
371,705
230,135
381,755 391,378
246,400
391,828
242,625
392,079
246,248
391,232
234,238
391,346
232,368
391,254
233,609
391,220
230,861
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Congestion Reduction:2020 Traffic Volume ComparisonCongestion Reduction:2020 Traffic Volume Comparison
Traffic Volume By Alternative and Toll Scenario
0
50,000
100,000
150,000
200,000
250,000
300,000
No Build MLK Coupler MRB: AllConnect - No
Toll
MRB: I-64Connect - No
Toll
MRB: NoConnect - No
Toll
MRB: AllConnect -
$1/$3
MRB: I-64Connect -
$1/$3
MRB: NoConnect -
$1/$3
MRB: AllConnect -
$2/$4
Poplar St. New MRB MLK McKinley Eads
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Congestion Reduction:2020 AM Westbound Volume to Capacity (V/C) Ratio
Congestion Reduction:2020 AM Westbound Volume to Capacity (V/C) Ratio
Traffic Congestion ReliefAM Westbound V/C Ratio By Alternative
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
No Build MLK Coupler MRB: AllConnect -
No Toll
MRB: I-64Connect -
No Toll
MRB: NoConnect -
No Toll
MRB: AllConnect -
$1 / $3
MRB: I-64Connect -
$1 / $3
MRB: NoConnect -
$1 / $3
MRB: AllConnect -
$2 / $4
Poplar New MRB MLK McKinley Eads
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Congestion Reduction:2020 PM Eastbound Volume to Capacity (V/C) Ratio
Congestion Reduction:2020 PM Eastbound Volume to Capacity (V/C) Ratio
Traffic Congestion ReliefPM Eastbound V/C Ratio By Alternative
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
No Build MLK Coupler MRB: AllConnect -
No Toll
MRB: I-64Connect -
No Toll
MRB: NoConnect -
No Toll
MRB: AllConnect -
$1 / $3
MRB: I-64Connect -
$1 / $3
MRB: NoConnect -
$1 / $3
MRB: AllConnect -
$2 / $4
Poplar New MRB MLK McKinley Eads
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Travel PatternsTravel PatternsMRB: All Connections
Sharon Greene & Associates
Internal/External Trips Analysis:New MRBInternal/External Trips Analysis:New MRB
Percent Change In External and Internal Crossings on MRBDaily Vehicle Trips
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
MRB: All Connect- No Toll
MRB: I-64Connect - No Toll
MRB: No Connect- No Toll
MRB: All Connect- $1/$3
MRB: I-64Connect - $1/$3
MRB: No Connect- $1/$3
MRB: All Connect- $2/$4
IL to MO (Internal) IL to MO (External/Through) IL to MO (External-Internal)
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Internal/External Trips Analysis:Poplar Street BridgeInternal/External Trips Analysis:Poplar Street Bridge
Percent Change In External and Internal Crossings on Poplar Daily Vehicle Trips
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
MLK Coupler MRB: AllConnect - No
Toll
MRB: I-64Connect - No
Toll
MRB: NoConnect - No
Toll
MRB: AllConnect -
$1/$3
MRB: I-64Connect - $1/$3
MRB: NoConnect - $1/$3
MRB: AllConnect - $2/$4
IL to MO (Internal) IL to MO (External/Through) IL to MO (External-Internal)
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Internal/External Trips Analysis:Change on Poplar Street BridgeInternal/External Trips Analysis:Change on Poplar Street Bridge
Change In Crossings on Poplar Bridge Compared to No Build: Daily Vehicle Trips
-35,000
-30,000
-25,000
-20,000
-15,000
-10,000
-5,000
0
5,000
10,000
MLK Coupler
MRB: AllConnect - No
Toll
MRB: I-64Connect - No
Toll
MRB: NoConnect - No
Toll
MRB: AllConnect -
$1/$3
MRB: I-64Connect -
$1/$3
MRB: NoConnect -
$1/$3
MRB: AllConnect -
$2/$4
IL to MO (Internal) IL to MO (External/Through) IL to MO (External-Internal)
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Annual Travel Time Savings:All BridgesAnnual Travel Time Savings:All Bridges
Annual Weekday Travel Time Savings Compared to No Build:AM Westbound Vehicle Trips - All Bridges
(Hours)
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
MLK Coupler MRB: AllConnect - No
Toll
MRB: I-64Connect - No
Toll
MRB: NoConnect - No
Toll
MRB: AllConnect -
$1/$3
MRB: I-64Connect -
$1/$3
MRB: NoConnect -
$1/$3
MRB: AllConnect -
$2/$4
All Bridges
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
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 BridgesAverage Per Vehicle Travel Time:
AM Westbound Trips(Minutes)
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
No Build MLK Coupler MRB: AllConnect -
No Toll
MRB: I-64Connect -
No Toll
MRB: NoConnect -
No Toll
MRB: AllConnect -
$1 / $3
MRB: I-64Connect -
$1 / $3
MRB: NoConnect -
$1 / $3
MRB: AllConnect -
$2 / $4
Poplar St. New MRB MLK
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Average Travel Time Between Key Origins and DestinationsAverage Travel Time Between Key Origins and Destinations
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Average Travel Time SavingsAverage Travel Time SavingsAverage Travel Time Savings Compared to No Build:
Trips Between Key Regional Origins and BJC Hospital(Minutes)
0
1
2
3
4
MLK Coupler MRB: AllConnect - No
Toll
MRB: I-64Connect - No
Toll
MRB: NoConnect - No
Toll
MRB: AllConnect -
$1/$3
MRB: I-64Connect - $1/$3
MRB: NoConnect - $1/$3
MRB: AllConnect - $2/$4
Edwardsville to BJC Hospital Collinsville to BJC Hospital Belleville to BJC Hospital
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Average Travel Time SavingsAverage Travel Time SavingsAverage Travel Time Savings Compared to No Build:
Trips Between Key Regional Origins and Clayton(Minutes)
0
1
2
3
4
MLK Coupler MRB: AllConnect - No
Toll
MRB: I-64Connect - No
Toll
MRB: NoConnect - No
Toll
MRB: AllConnect -
$1/$3
MRB: I-64Connect - $1/$3
MRB: NoConnect - $1/$3
MRB: AllConnect - $2/$4
Edwardsville to Clayton Collinsville to Clayton Belleville to Clayton
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Average Travel Time SavingsAverage Travel Time SavingsAverage Travel Time Savings Compared to No Build:
Trips Between Key Regional Origins and Lambert International Airport(Minutes)
0
1
2
3
4
MLK Coupler MRB: AllConnect - No
Toll
MRB: I-64Connect - No
Toll
MRB: NoConnect - No
Toll
MRB: AllConnect -
$1/$3
MRB: I-64Connect - $1/$3
MRB: NoConnect - $1/$3
MRB: AllConnect - $2/$4
Edwardsville to Lambert Int. Airport Collinsville to Lambert Int. Airport Belleville to Lambert Int. Airport
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Average Travel Time SavingsAverage Travel Time SavingsAverage Travel Time Savings Compared to No Build:
Trips Between Key Regional Origins and Westport Plaza(Minutes)
0
1
2
3
4
MLK Coupler MRB: AllConnect - No
Toll
MRB: I-64Connect - No
Toll
MRB: NoConnect - No
Toll
MRB: AllConnect -
$1/$3
MRB: I-64Connect - $1/$3
MRB: NoConnect - $1/$3
MRB: AllConnect - $2/$4
Edwardsville to Westport Plaza Collinsville to Westport Plaza Belleville to Westport Plaza
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Regional Economic Development ImpactsRegional 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?
Sharon Greene & Associates
Potential Toll Revenue GenerationPotential Toll Revenue Generation●Toll Diversion Rates●Assumptions●Potential Revenue Generation●Potential Funding Scenario
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Estimated Toll Diversion Rates:Travel Demand Model Results Estimated Toll Diversion Rates:Travel Demand Model Results
New MRB Estimated Diversion Rates
0%
25%
50%
75%
100%
MRB: All Connect - $1/$3 MRB: I-64 Connect - $1/$3 MRB: No Connect - $1/$3 MRB: All Connect - $2/$4
All Vehicles Autos Trucks
Source: East-West Gateway Council of Government Travel Demand Model Run
Sharon Greene & Associates
Potential Toll Bond Revenue Generation: AssumptionsPotential 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%
Sharon Greene & Associates
Potential Toll Bond Revenue Generation Estimate:Travel Demand Model Results (in millions)
Potential Toll Bond Revenue Generation Estimate:Travel Demand Model Results (in millions)
MRB: All Connect -
$1/$3
MRB: I-64 Connect -
$1/$3
MRB: No Connect -
$1/$3
MRB: All Connect -
$2/$4
2020 Annual Auto Volume 6.96 6.99 5.43 2.33
2020 Annual Truck Volume 0.62 622,380 0.56 0.76
Annual Toll Revenue $8.81 $8.86 $7.10 $7.71
Annual O&M Estimate $0.88 $0.89 $0.71 $0.77
Annual Net Revenue $7.93 $7.96 $6.39 $6.94
Available for Bonding (1.4 Coverage)
$5.66 $5.70 $4.57 $4.96
Bond Issue $80.00 $80.00 $64.00 $70.00
Percent of Total Project Costs 4.54% 5.12% 6.41% 3.97%
Additional Cost to Project (Interest on Bonds)
$89.72 $89.72 $71.78 $78.5
Sharon Greene & Associates
Potential Funding Scenarios:Travel Demand Model ResultsPotential Funding Scenarios:Travel Demand Model Results
Potential Funding Scenario/ Funding Gap Analysis(in millions)
$0
$200
$400
$600
$800
$1,000
$1,200
$1,400
$1,600
$1,800
$2,000
Funding Gap $1,234 $1,033 $486 $1,244
Potential Toll Revenue Bonds $80 $80 $64 $70
Potential Additional IDOT $210 $210 $210 $210
SAFETEA-LU Earmarks $239 $239 $239 $239
MRB: All Connect - $1/$3 MRB: I-64 Connect - $1/$3 MRB: No Connect - $1/$3 MRB: All Connect - $2/$4
Sharon Greene & Associates
Potential Funding Scenarios:Travel Demand Model ResultsPotential Funding Scenarios:Travel Demand Model Results
Potential Funding Scenario/ Funding Gap Analysis(Percent of Total Project Costs)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Funding Gap 70% 66% 49% 71%
Potential Toll Revenue Bonds 5% 5% 6% 4%
Potential Additional IDOT 12% 13% 21% 12%
SAFETEA-LU Earmarks 14% 15% 24% 14%
MRB: All Connect - $1/$3 MRB: I-64 Connect - $1/$3 MRB: No Connect - $1/$3 MRB: All Connect - $2/$4
Sharon Greene & Associates
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%
Sharon Greene & Associates
Potential Toll Bond Revenue Generation Estimate:Consultant Assumption (in millions)
Potential Toll Bond Revenue Generation Estimate:Consultant Assumption (in millions)
MRB: All Connect -
$1/$3
MRB: I-64 Connect -
$1/$3
MRB: No Connect -
$1/$3
MRB: All Connect -
$2/$4
2020 Annual Auto Volume 13.45 13.14 8.15 8.07
2020 Annual Truck Volume 2.74 2.54 1.86 1.65
Annual Toll Revenue $21.68 $20.75 $13.73 $22.73
Annual O&M Estimate $2.17 $2.08 $1.37 $2.72
Annual Net Revenue $19.51 $18.68 $12.36 $20.45
Available for Bonding (1.4 Coverage)
$13.94 $13.34 $8.82 $14.61
Bond Issue $195.00 $189.00 $172.00 $205.00
Percent of Total Project Costs 11.06% 12.10% 17.21% 11.63%
Additional Cost to Project (Interest on Bonds)
$218.69 $211.96 $192.86 $229.90
Sharon Greene & Associates
Potential Funding Scenarios:Consultant AssumptionsPotential Funding Scenarios:Consultant Assumptions
Potential Funding Scenario/ Funding Gap AnalysisConsultant Assumptions
(in millions)
$0
$200
$400
$600
$800
$1,000
$1,200
$1,400
$1,600
$1,800
$2,000
Potential Toll Revenue Bonds $1,119 $924 $378 $1,109
Potential Additional IDOT $195 $189 $172 $205
IDOT STIP $210 $210 $210 $210
SAFETEA-LU Earmarks $239 $239 $239 $239
MRB: All Connect - $1/$3 MRB: I-64 Connect - $1/$3 MRB: No Connect - $1/$3 MRB: All Connect - $2/$4
Sharon Greene & Associates
Potential Funding Scenarios:Consultant AssumptionsPotential Funding Scenarios:Consultant Assumptions
Potential Funding Scenario/ Funding Gap AnalysisConsultant Assumptions
(Percent of Total Project Costs)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Potential Toll Revenue Bonds 63% 59% 38% 63%
Potential Additional IDOT 11% 12% 17% 12%
IDOT STIP 12% 13% 21% 12%
SAFETEA-LU Earmarks 14% 15% 24% 14%
MRB: All Connect - $1/$3 MRB: I-64 Connect - $1/$3 MRB: No Connect - $1/$3 MRB: All Connect - $2/$4
Sharon Greene & Associates
Questions?Questions?