cedar party creek bridge replacement - mid-coast council
TRANSCRIPT
Cedar Party Creek Bridge
Replacement Community Consultation Slides
Midcoast Council have been successful in being awarded an Infrastructure NSW - Fixing Country Roads grant to progress options to replace Cedar Party Creek Bridge. Grant details:
• Grant value = $350K• Scope - to investigate options and complete design on
preferred option.• NO construction.• Complete detail design by end of 2017• A final design will allow Council to apply for a FCR grant
to fund construction.
Background
Replacement of Cedar Party Creek Bridge has been considered for numerous years. Options were considered in 1986:
• Over 500 submissions received
• Preferred option – replace existing bridge
• Cost prohibitive (even to design)
• No funding source identified
• Option was not built
Background
Current situation:• Timber bridge constructed in 1960s• Deck replaced with a Stress Laminated Timber deck in 1994• Replacement required in the next 10 years • Services over 10,000 vehicles/day (100+ heavy vehicles)• Weight limits could be imposed to maintain safety
Background
Considerations of Cedar Party Creek Bridge:• On a Regional freight route• Currently impacted by flooding (1 in 5 year event)• Adjacent to a level rail crossing (boom gates)• Adjacent intersection is confusing – priority right turn to
accommodate heavy vehicles• Important access to Wingham• Community impact during
construction phase
Background
Background
Chrissy Gollan Park
Swimming Pool Bowling Club
Schools
Wingham Town Centre
Background
Funding considerations Refurbish existing bridge
Replace bridge
Improve flood access
Improve freight route
Potential to remove level crossing
Improve intersection
Improve an asset
Availability of grants
Background
Funding considerations Refurbish existing bridge
Replace bridge
Improve flood access
Improve freight route
Potential to remove level crossing
Improve intersection
Improve an asset
Availability of grants
To be successful in achieving a grant to construct, options need to address
these considerations
Council Engineers along with bridge & road design consultants considered many options, with 8 identified for further consideration. These 8 options have been developed with consideration of:
• Community impacts such as:- local economy- community functionality- noise/air impacts- gateway to Wingham
• Consultation with:- internal stakeholders- consulting specialists- RMS, ARTC, Infrastructure NSW
Strategic design and cost estimates have been determined for each option. Options have been scored and assessed using a weighted criteria analysis.
Options
• With all options the old Cedar Party Creek bridge will be demolished. Cost and safety inhibit it being maintained for low volume vehicular or pedestrian use.
• ARTC will not support the relocation of the railway level crossing. If the rail crossing point needs to move a bridge over the tracks, high enough for double stack trains to pass underneath, would need to be included and ARTC would not contribute any funds toward this option.
Points of note
A
B
C
D
EF
G
H
H
A. Around the BackB. Rowley StC. Ruth StD. North of the RailE. Existing AlignmentF. Eastern OffsetG. Pool RelocationH. Across the Floodplain
Note:• no particular order• each option has multiple
variations
Eight options considered
The Roundabout
All options that include the current Wynter St / Combined St intersection have a common roundabout design. The roundabout requires a large volume of fill on the low side and a large cut on the high side. Significant retaining walls would be required on the south / west corner of the roundabout. It is a single lane roundabout with a mountable central island for trucks.
Around the Back
Pro’s:• Can be constructed (mostly) offline• Minimal impact to Chrissy Gollan Park• Less visual/noise impact on existing residences• Will enable future subdivision development
Con’s:• Only an option if constructed with rail overpass
(significant cost) – road could be diverted back to existing rail crossing, but why go around the back then?
• Construction of roundabout complicated – high traffic impact, lengthy construction time
• Additional 1km of road construction ($)• Impact of roundabout on properties (acquisition)• Visual impact and costly retaining walls
Construction:• Timeframe = 11 months• Detours = local detours to
permit roundabout construction.
Rowley Street
Pro’s:• Provides for a neat and visually aesthetic solution• Can be constructed offline
Con’s:• Diverts traffic past school (major safety concern)• Diverts traffic past numerous residents and
Wingham Brush (noise, environmental)• Long and expensive bridge structure (120m)• Requires upgrade to intersection of Rowley and
Combined St (further cost increase) • Cuts access to Chrissy Gollan Park
Construction:• Timeframe = 12 months• Detours = none. Traffic
control to permit tie ins at Wingham Rd and Rowley St.
Ruth Street
Pro’s:• Can be constructed offline• Removes a turning manoeuvre for the majority of
traffic flow• Improved ease for heavy vehicles moving through town
Con’s:• Takes traffic immediately past Ruth Street residents
(great impact on noise and visual – new road height approx roof height)
• Complicated solution (bridge and road parallel to creek)• Long and expensive bridge structure (140m)• Requires full acquisition of the bowling club• Cuts access to Chrissy Gollan Park
Construction:• Timeframe = 12 months• Detours = none. Traffic
control to permit tie ins at Combined St / Wynter St and Wingham Rd.
North of the Rail
Pro’s:• Decommission two existing level crossings• Only requires one small bridge
Con’s:• Unappealing entrance to Wingham (effectively
bypasses Wingham)• Diverts light vehicle traffic away from the CBD• Poor cost benefit ration - requires an upgrade to
Farquar Street to accommodate B Doubles and requires acquisition/demolition of numerous properties
• Cuts access to Chrissy Gollan Park
Construction:• Timeframe = 11 months• Detours = local detours to
permit construction on Price St.
Existing Alignment
Pro’s:• Cost effective• Can be implemented
with or without a bridge over the rail line.
• Minimal change to the current approach to Wingham
Con’s:• Significant impact on traffic during construction• Temp bridge crossing connecting to Mortimer St for light vehicles (6 months+) • Detour for semi-trailers and B-doubles via Gloucester Road - 6 months +
(additional time and running costs, deterioration of detour route)• Construction of roundabout complicated – high traffic impact, lengthy
construction time• Impact of roundabout on properties (acquisition)• Visual impact and costly retaining walls• Significant impact to Chrissy Gollan Park
Construction:• Timeframe = 12 months• 4 month Detour = heavy vehicles via The Bucketts Way
and Gloucester Rd (additional 24km and 21 minutes). Light vehicles via temporary bridge to Mortimer St high flood susceptibility in which case detour via Tinonee if Bight Bridge is passable otherwise Burrell Creek).
Eastern Offset
Pro’s:• Some of this project could be constructed offline• Gives priority to heavy vehicles moving through
town
Con’s:• Only an option if constructed with rail overpass
(significant cost)• Chrissy Gollan Park consumed• Major property impact - requires partial
acquisition of the bowling club and 3 other lots• Staging of roundabout complicated and costly
Construction:• Timeframe = 12 months• Detours = local detours to
permit roundabout construction.
Pool RelocationPro’s:• Cost effective• Attractive entry to
Wingham• Removes a turning
manoeuvre for the majority of traffic flow
• Improved ease for heavy vehicles moving through town (improved safety and freight movement)
• Minimal land acquisition or retaining walls
• Constructed offline• Can be implemented
without a rail grade separation
Con’s:• Pool to be relocated
(funded in this project)• Some impact on Chrissy
Gollan Park• Bridge located on a
radius/extra width for turning lanes
Construction:• Timeframe = 10 months• Detours = traffic control
required to permit tie-ins at Wingham Rd and Combined St.
Across the Floodplain
Pro’s:• Can be constructed offline
Con’s:• Diverts traffic past a school and residents• Additional 2km of greenfield road construction ($)• Requires massive amount of fill (or viaduct) to cross the
floodplain • Unstable ground• Flood prone / flooding issues
Construction:• Timeframe = 14 months• Detours = traffic control required to
permit Wingham Rd tie-in and construction along East Combined St.
Weighted Criteria Score
Strategic Cost Estimate
No Rail Overpass Road Overpass
Around the Back 75 $20.4m $39.2m
Rowley St 59 n/a $28.9m
Ruth St 42 n/a $35.8m
North of Rail 38 n/a $25.6m
Existing Alignment 102 $18.4m $32.1m
Eastern Offset 96 n/a $33.0m
Pool Relocation 129 $19.1m $29.0m
Across the Floodplain Has not been priced or scored
Summary of Options
Summary of Options
Fixing Country Roads grant for construction will support the cost to relocate the swimming pool if this is the preferred option and the Benefit Cost Ratio (BCR) stacks up.
Swimming pool funding will not stretch beyond like for like replacement.
Existing pool is estimated at $1.5m to replace.
For $1.5m, you could get a new 6 lane 50m outdoor non heated swimming pool or a 6 lane 25m pool with a covered children’s wet play area.
Visitations per year (includes all) = 17,000 (93 per day)
Annual maintenance = $50k, Annual operating costs $140k
Significant upgrades required to prolong life
Swimming Pool
Existing Alignment – more pictures
Pool Relocation – more pics
Community suggested option: Queen Street
Pro’s:• Existing Cedar Party Creek Bridge character remains• Heavy vehicles detour further away from CBD
Con’s:• Heavy vehicles diverted past 37 homes and a pre-
school (currently 28 homes)• Queen St is not flood free• Maintenance burden remains to keep Cedar Party
Creek Bridge and this bridge will still have a limited life even with light vehicles only
• Intersection at Combined / Wynter St can not be improved.
Construction:• Timeframe = 12 months• Detours = local detours to
permit construction of connections to Wingham Rd and Queen St.
Budget Estimate = $23m
Features:• Roundabout at intersection
of Youngs Rd / Wingham Rd• Roundabout at intersection
of new road and Queen Street
• Improvements required at roundabout at Dennes St / Farquar St roundabout
• Improvements of the Farquhar St bridge required