I-84 Mainline Crosses RR Twice Why I-84 was elevated when - - PowerPoint PPT Presentation

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I-84 Mainline Crosses RR Twice Why I-84 was elevated when - - PowerPoint PPT Presentation

Jan 07, 2024 213 likes •432 views

I-84 Mainline Crosses RR Twice Why I-84 was elevated when constructed in 1960s Currently 80% of highway is elevated (30 acres) Orange = elevated or structure Mainline Alternatives Alternative 1: No-Build Green Alternative 2

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SLIDE 1
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SLIDE 2

I-84 Mainline Crosses RR Twice

Why I-84 was elevated when constructed in 1960s

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SLIDE 3

Currently 80% of highway is elevated (30 acres)

Orange = elevated or structure

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SLIDE 4
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SLIDE 5

Mainline Alternatives

  • Alternative 1: No-Build

Green

  • Alternative 2 (elevated)

Blue

  • Alternative 3 (lowered)

Yellow

  • Alternative 4 (tunnel)

Brown

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SLIDE 6

Cost in $ Billions

Probabilistic Cost Estimate Ranges

Alternatives

$- $2.0 $4.0 $6.0 $8.0 $10.0 $12.0 $14.0

No-Build Elevated Highway Lowered Highway Tunneled Highway $3.1 $2.5 $12.1 $9.7 $5.3 $4.3 $6.2 $4.9

August 2015

Based on risk based cost analyses

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Cost Range and Project Status

Estimated Project Cost

Planning 30% Design 100% Design Construction Management Initial Probabilistic Range Significant Risks Realized Few Risks Realized Currently at 5-10%

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Lowered Highway

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Preliminary Estimated Program Costs

(Lowered Highway)

  • Hard Costs

Approx.

  • Construction

$ 1.5 b

  • Utilities

100 m 1.6 b

  • Soft Costs
  • Program Management

50 m

  • Design Engineering

120 m

  • Construction Engineering

230 m

  • Property Acquisition

180 m 0.6 b

  • Escalation

1.5 b

  • Risk Costs

0.6 – 1.6 b

Total 4.3 – 5.3 b

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SLIDE 10

Major Cost Elements (Lowered Hwy)

  • Freeway & ramps
  • Extensive local roads (new & reconstructed)
  • Bridges
  • Viaduct demolition
  • Construction staging
  • Traffic control
  • Railroad relocation (not a typical project cost)
  • Utility relocations
  • Cost escalation on all elements

expensive in downtown area

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SLIDE 11

Existing Conditions (West)

N

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Existing I-84 Mainline Exit 46: Sisson Ave. Exit 47: Sigourney St. N

Existing Mainline and Ramps (West)

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Subject to changed based upon ongoing analysis and design

Preliminary

Option W3-3

Proposed Roadway Layout

N

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East Coast Greenway

Subject to changed based upon ongoing analysis and design

CONCEPTUAL - FOR ILLUSTRATIVE PURPOSES ONLY

N

Option W3-3

Potential Complete Streets

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SLIDE 15

Existing Conditions (East)

N

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SLIDE 16

Exit 49: High St. Exit 50: Trumbull St. Exit 48A: Capitol Ave. Exit 48B: Asylum St. Exit 48: Asylum Ave. Exit 47: Sigourney St. N

Existing Mainline and Ramps (East)

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N

Existing Railroad (East)

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Relocated Railroad Station Annex Preliminary

Subject to change based upon ongoing analysis and design

N

Relocated Railroad and New Station Annex

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Preliminary

Subject to change based upon ongoing analysis and design

N

Option 3B: E2(S)

Proposed Roadway Layout

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SLIDE 20

East Coast Greenway

Subject to changed based upon ongoing analysis and design.

CONCEPTUAL - FOR ILLUSTRATIVE PURPOSES ONLY

Exploring Flower St. Reconnection

N

Option 3B: E2(S)

Potential Complete Streets

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SLIDE 21

Preliminary

Subject to change based upon ongoing analysis and design

N

Lowered Options W3-3 & 3B E2(S) shows extensive reconnections & modification needed on local road network