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
13 Location Map
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 Initiated Project Project Contract Funded Defined Award Project Project Design Construction Definition Quantify areas of Identify resources & impact constraints Environmental Evaluate alternatives permits Public participation Develop plans, Build Consensus estimate and specifications Right-of-Way process if necessary
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 over the bridge? A. Daily B. Weekly C. Monthly D. Rarely E. Never
Prior to the closure, how often did you bike over 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 Bridge Rail Deck Beams (Superstructure) Abutment (Substructure) 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
Looking North Over the Culvert Existing Conditions - Bridge #23 TH 13 exceeds minimum standard for width Utility Relocation Likely
Design Criteria and Considerations 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
Alternatives Considered – Bridge #23 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
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
What Will the New Bridge Look Like? Proposed Example - Bridge #23 Slab Bridge
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
Alternatives Matrix Recommended Permanent Closure Full Bridge Replacement Eden BO 1448(44) Single Span No Access Pedestrian Bridge Buried Structure Bridge Total Project Costs $333,600 $483,600 $1,045,020 $1,197,260 (Including E & C) $8,340 (2.5%) $24,180 (5%) $52,250 (5%) $59,860 (5%) Town Share (%) 3 years 3 years 3 years 3 years Project Development Duration 8 months 8 months 2 months 3 months Construction Duration No Change No Change Possible Relocation Possible Relocation Utility ROW Acquisition Possible – ROW not Plotted N/A 80 years Design Life
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
Next Steps – Bridge #23 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
For more information: https://outside.vermont.gov/agency/vtrans/external/Projects/Structures/16J176 Eden BO 1448(44) Questions and Comments Town Highway 13– Bridge #23 over the White Branch of Gihon River October 23, 2017
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