Eden BO 1448(44) Alternatives Presentation Meeting TH 13 Bridge - - PowerPoint PPT Presentation

Eden BO 1448(44) Alternatives Presentation Meeting

TH 13 – Bridge #23 over the White Branch of Gihon River

October 23, 2017

Introductions

Rob Young, P.E.

VTrans Design Project Manager

Laura Stone, P.E.

VTrans Scoping Engineer

Purpose of Meeting

• Provide an understanding of our approach to the

project

• Provide an overview of project constraints
• Discuss alternatives that were considered
• Discuss our recommended alternative
• Provide an opportunity to ask questions and voice

concerns

Location Map

13

Bridge 23 Project Location

Meeting Overview

• VTrans Project Development Process
• Project Overview

– Existing Conditions – Alternatives Considered – Recommended Alternative

• Maintenance of Traffic
• Schedule
• Summary
• Next Steps
• Questions

VTrans Project Development Process

Project Definition Project Design Construction Project Funded Project Defined Contract Award

• Quantify areas of

impact

• Environmental

permits

• Develop plans,

estimate and specifications

• Right-of-Way

process if necessary

Initiated

• Identify resources &

constraints

• Evaluate alternatives
• Public participation
• Build Consensus

Who are you representing?

• A. Municipal Official
• B. Resident
• C. Local Business
• D. School

E. Emergency Services F. Independent Organization

• G. Other

Prior to the closure, how often did you use this segment of Knowles Flat Road?

• A. Daily
• B. Weekly
• C. Monthly
• D. Rarely
• E. Never

Prior to the closure, how often did you walk

• ver the bridge?
• A. Daily
• B. Weekly
• C. Monthly
• D. Rarely
• E. Never

Prior to the closure, how often did you bike

• ver the bridge?
• A. Daily
• B. Weekly
• C. Monthly
• D. Rarely
• E. Never

What is your reason for attending this meeting?

• A. Specific Concern
• B. General Interest
• C. Live in Close Vicinity
• D. Other

Project Overview

• Existing Conditions
• Alternatives Considered
• Recommended Alternative

Description of Terms Used

Beams (Superstructure) Deck Abutment (Substructure) Bridge Rail

Cross Section of Bridge

Existing Conditions – Bridge #23

• Roadway Classification – Local Road
• Bridge Type – Bridge Removed in 2016 Due to

Failure

• Ownership – Town of Eden

Existing Conditions – Bridge #23

• The existing twin corrugated galvanized metal plate pipe

arches FAILED and have been removed

• The previous culverts probably didn’t meet the ANR

standard for BFW

• Survey has not been completed

– Expect to have all resource requests complete by January 2018

Existing Conditions - Bridge #23

• TH 13 exceeds minimum standard for width
• Utility Relocation Likely

Looking North Over the Culvert

• ADT of 720 veh/day
• DHV of 150 veh/hr
• % Trucks: 11.0
• Design Speed of 35 mph
• Class II wetlands within majority of the project area

Design Criteria and Considerations

• Disinvestment

– Two good bypass routes – Eden Central School is located on Town Highway 13 – this alternative includes the option for a pedestrian bridge

• The school serves as Eden’s primary Red Cross emergency shelter and is only

accessible via VT Route 100, limiting access in an emergency – Includes bus turnaround at each approach

• Full Bridge Replacement – Buried Structure

– May be discounted based on hydraulic findings – 80 year design life

• Full Bridge Replacement – Bridge

– 80 year design life

Alternatives Considered – Bridge #23

Proposed Typical Section

Recommended Alternative - Bridge #23

• Full Bridge Replacement

– Maintain current roadway width to match existing conditions (9’/4’ typical) – Meet minimum hydraulic recommendations for the site – ROW and utility relocation may be needed – Bridge to remain closed through construction

Proposed Example - Bridge #23

• Slab Bridge

What Will the New Bridge Look Like?

Maintenance of Traffic Options Considered

• Bridge has been closed since 2016 – makes sense to keep it

closed through construction

• ROW to be requested after survey is complete – may be

needed even with a bridge closure

Road Closure (Replacement Option)

• Detour signed by Town
• Road Closed since 2016
• 3.4 miles end-to-end

Traffic Control – Local Detour

• The shortest local detour

route, has an End-to-End distance of 3.4 miles

Recommended Scope

• Replace entire structure with structure meeting hydraulic

and geotechnical recommendations:

– Bridge to remain closed throughout construction – Utility relocation may be needed – ROW may be needed – Construction – Summer 2021

Eden BO 1448(44) Permanent Closure Full Bridge Replacement No Access Pedestrian Bridge Buried Structure Single Span Bridge Total Project Costs

(Including E & C)

$333,600 $483,600 $1,045,020 $1,197,260

Town Share (%) $8,340 (2.5%) $24,180 (5%) $52,250 (5%) $59,860 (5%) Project Development Duration

3 years 3 years 3 years 3 years

Construction Duration

2 months 3 months 8 months 8 months

Utility

No Change No Change Possible Relocation Possible Relocation

ROW Acquisition

Possible – ROW not Plotted

Design Life

N/A 80 years

Alternatives Matrix

Recommended

Which would you be most concerned about?

• A. Bridge Aesthetics
• B. Environmental

Impacts

• C. Recreational Impacts
• D. Other
• E. Not Really Concerned

Which design aspect is the most important to you?

• A. Shoulder

width/bicycle accommodations

• B. Aesthetics – Bridge

Railing

• C. Construction Year
• D. Construction Duration
• E. Cost
• F. Other

Did you find this presentation to be?

• A. Too technical in

nature

• B. Too simplified
• C. Just about right
• D. Not much use at all

Do you find the recommended scope of work satisfactory?

• A. Yes
• B. No

This is a list of a few important activities expected in the near future and is not a complete list of activities.

Wait for Town response to recommendation on proposed project

• Develop Conceptual plans and distribute for comment
• Process local agreements
• Right-of-Way process (if needed)
• Updates on project plans and estimates at each

submittal

• Request a Pre-Closure Meeting (optional here)
• Town is responsible for any chosen detour route

Next Steps – Bridge #23

Eden BO 1448(44) Questions and Comments

Town Highway 13– Bridge #23 over the White Branch of Gihon River

October 23, 2017

For more information:

• https://outside.vermont.gov/agency/vtrans/external/Projects/Structures/16J176