Eden BO 1448(44) Alternatives Presentation MeetingTH 13 – Bridge #23 over the White Branch of Gihon RiverOctober 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 23Project 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

ProjectFunded

ProjectDefined

ContractAward

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 OfficialB. ResidentC. Local BusinessD. SchoolE. Emergency ServicesF. Independent 

OrganizationG. Other

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

A. DailyB. WeeklyC. MonthlyD. RarelyE. Never

Prior to the closure, how often did you walk over the bridge?

A. DailyB. WeeklyC. MonthlyD. RarelyE. Never

Prior to the closure, how often did you bike over the bridge?

A. DailyB. WeeklyC. MonthlyD. RarelyE. Never

What is your reason for attending this meeting?

A. Specific ConcernB. General InterestC. Live in Close VicinityD. 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 StructureSingle 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 months8 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 AestheticsB. Environmental 

ImpactsC. Recreational ImpactsD. OtherE. Not Really Concerned

Which design aspect is the most important to you?

A. Shoulder width/bicycle accommodations

B. Aesthetics – Bridge Railing

C. Construction YearD. Construction DurationE. CostF. Other

Did you find this presentation to be?

A. Too technical in nature

B. Too simplifiedC. Just about rightD. Not much use at all

Do you find the recommended scope of work satisfactory?

A. YesB. 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 CommentsTown Highway 13– Bridge #23 over the White Branch of Gihon RiverOctober 23, 2017

For more information: https://outside.vermont.gov/agency/vtrans/external/Projects/Structures/16J176