corridor study and environmental assessment - …...2013/12/12 · sd44 / platte-winner bridge...
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MARKET
Archeology
Laboratory
(Augustana)
SD44 / PLATTE-WINNER BRIDGE
CORRIDOR STUDY AND
ENVIRONMENTAL ASSESSMENTPUBLIC MEETINGS, DECEMBER 12-13, 2017
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
PRESENTATION OVERVIEW
1) Study Team
2) Bridge/Corridor History
3) Project Objectives
4) Roadway Alignment Alternatives Screening
5) Bridge Alternatives Screening
6) Environmental Process
7) Public Input
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
INTRODUCTIONS – STUDY ADVISORY TEAM
STUDY ADVISORY TEAM
Marion Barber – FHWA Jay Larson – SDDOT
Paul Coughlin - SDGFP Tom Lehmkuhl – SDDOT
Travor Diegel – SDDOT Al Nedved - SDGFP
Steve Gramm – SDDOT Jay Peppel – SDDOT
Kevin Griese – SDDOT Claire Peschong – SDDOT
Marc Hoelscher – FHWA Brian Raecke – SDDOT
Mark Hoines – FHWA Jay Tople - SDDOT
Steve Johnson – SDDOT
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
INTRODUCTIONS – CONSULTANT TEAM
• HR Green
• Tim Thoreen – Project Manager, Environmental Task
Lead
• Jon Wiegand – Traffic and Roadway Task Lead
• Kevin Brehm – Bridge Task Lead
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
PROJECT CORRIDOR/BRIDGE HISTORY
• Bridge opened to traffic in 1966, major repairs in
1997 on two piers, 4-month closure of bridge
• 2016 SDDOT study: SD44 a top priority among our
major bridges
• Landslides in the corridor have been a long-standing
maintenance cost
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
STUDY EXPECTATIONS AND OBJECTIVES
• Conduct traffic studies to evaluate safety and
operations of the roadway today and in the future
• Complete a bridge location and type study for a
new long-term (100+ years) bridge
• Complete the environmental process necessary
to advance the project into final design
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
• Challenging soils and steep
slopes represent severe
constraints on construction of a
stable new roadway alignment
• Repairs on existing roadway
have substantially reduced
landslides on SD44 in recent
years
GEOTECHNICAL CONDITIONS
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Traffic Volumes
• Less than 900 vehicles/day
cross the bridge in 2017
• Forecast for 1,400 vehicles/day
in 2050
TRAFFIC CONDITIONS
Crash History (2012-2016)
• More than half of reported
crashes were animal collisions
• Majority of other crashes were
single-car type
• One (single-car) crash at an
intersection
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Traffic Study Findings
• No long-term issues for capacity
• Crash data do not indicate roadway design problems
• Corridor intersections are not congested and do not have crash history
• Recreation Area has safety concerns, but little documented crash data exist
Alternatives Implications
• New alignment location would have limited traffic benefits versus current alignment
• New roadway alignments will have significant geotechnical challenges (costs)
• May want to consider options at the Recreation Area for turning/ crossing conflicts
TRAFFIC STUDIES FINDINGS
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
May 2017 Public Meetings
• No closures or detours! A regionally-important crossing
• Freight corridor, emergency services, lengthy detour is a major impact
• Poor sight lines approaching the bridge (especially eastbound)
• Valuable access to Snake Creek Recreation Area
TRAFFIC & ROADWAY FEEDBACK FROM PUBLIC
Eastbound view of the bridge approach
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Scoping Initial Findings
• Deep foundations in the river (>200 feet to bedrock)
• Existing crossing location is about optimal for minimizing length of bridge
• Cannot repair existing bridge or replace in same location and meet project objectives
Alternatives Implications
• The new bridge will be in a new location, but close to existing
• Girder/slab and segmental concrete bridge types appear most feasible
• Note: bridge type determination does not appear to be influenced by alignment location decision
BRIDGE PROCESS AND FINDINGS
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
May 2017 Public Meetings
• Narrow bridge is a challenge for large vehicles (e.g. farm
equipment) to cross without conflict
• Is construction of a causeway (similar to I-90 at Chamberlain) a
possible solution?
• Can the current bridge be re-purposed for pedestrian and bike
users instead of being demolished after the new bridge is built?
BRIDGE FEEDBACK FROM PUBLIC
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Scoping - Initial Efforts
• Agency/Tribal outreach
• Public involvement
• Field studies
Environmental Findings
• Recreational resources
• Section 4(f)/6(f) properties
• Cultural resources
• Wetlands/water resources
• Social and economic resources
ENVIRONMENTAL ISSUES
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Recreational Resources
• Snake Creek Recreation Area
notable among other parks and
resources (State Parks and
Wildlife Resource Areas)
• Section 4(f) protections require
close coordination with resource
owner (SDGFP) and FHWA
regarding impact avoidance
ENVIRONMENTAL ISSUES
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Development of Evaluation Criteria
• Based on the input received from the Study Advisory
Team, Resource Agencies, and the public
• Create the criteria before we identify alternatives
• Two sets of criteria developed:
• Alignment / Roadway location
• Bridge type
SO WHAT DO THESE ISSUES MEAN?
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Five categories of criteria were developed
1. Environmental• Recreational, Cultural Resources, Water, Socioeconomic,
Construction Impact
2. Geotechnical• Conflicts with existing foundation, footprint, long-term
maintenance, initial construction cost
3. Bridge Location• Implication of alignment on bridge length, ability to remove the
existing bridge
SD44 ALIGNMENT EVALUATION CRITERIA
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Five categories of criteria were developed
4. Roadway/Traffic
• Maintenance of traffic, access, sight lines/geometry, safety,
amount of new roadway required
5. Constructability/ Cost-Effectiveness
• Constructability, staging, right-of-way, cost
SD44 ALIGNMENT EVALUATION CRITERIA
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Separately developed several location options
• Alignment alternatives reflect various measures to address the concerns identified in scoping (e.g. improve sight lines)
• Seven upstream variations of parallel and “skewed” alignments, up to 600’ feet away from current bridge
• Two downstream variations – one parallel and one skewed, up to 300’ separation
ALIGNMENT ALTERNATIVES
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Applied the criteria to alternatives
• Qualitatively evaluated each alternative (+, 0, -)
• Assess the effectiveness of strategies represented by each alternative
• Screen alternatives to a smaller set for further study and refinement
EVALUATION / SCREENING OF ALTERNATIVES
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
After screening, the following
alternatives remain under
consideration:
1. Parallel, adjacent, and upstream
2. Parallel, adjacent, and
downstream
3. “Skewed” alignment upstream
ALTERNATIVES FOR REFINEMENT
Recurring themes in the evaluation point to three key issues that will weigh heavily in determination of a Recommended Alternative:
- Geotechnical
- Section 4(f)/6(f), Snake Creek Recreation Area
- Cultural Resources
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Distance from Existing Bridge
• Based on construction methods used for current bridge, geotechnical
hazards may exist below water
• Minimize risk by locating new bridge beyond a “buffer zone”
• Currently using a 125’ separation from deepest foundations
ALIGNMENT SCREENING FACTOR
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
“N125” ALIGNMENT
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
“NORTH SKEWED” ALIGNMENT
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
“S125” ALIGNMENT
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Section 4(f) Impacts – Snake Creek Recreation Area
• Upstream or downstream alignment choice has very different impacts on the park
• Construction and long-term impacts to consider
• SDGFP involvement required for final decisions
ALIGNMENT SCREENING FACTOR
Maintenance,
Admin., &
Property Mgr.
Boat launch
and access
Dump Station
Welcome
Center and
campgrounds
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Snake Creek Recreation Area
• Topography of the park varies
• Access to facilities during and after construction will be evaluated during this next phase of work
RECREATIONAL RESOURCES
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Snake Creek
Recreation Area
• Campground
facilities on
south side of
SD44
• Nearest sites
sheltered by
trees
RECREATIONAL RESOURCES
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
West Side Boat
Ramp
• Additional boat
ramp capacity
outside of SCRA
• Downstream
side (versus
SCRA access on
upstream side)
RECREATIONAL RESOURCES
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Initial scoping of bridge types left two major types
• Girder/Slab
• variations for steel or concrete, constant depth or variable)
• Concrete Segmental
• using balanced cantilever construction technique to achieve
longer span lengths
BRIDGE ALTERNATIVES
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Features
• Common bridge type (including
existing SD44 bridge)
• Span length: 100’ to 450’
• Conventional construction
MAJOR BRIDGE TYPE – GIRDER/SLAB
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Features
• Concrete bridge
• Span length: 100’ to 650’
• Comparatively expensive
construction – has been used
in North Dakota
MAJOR BRIDGE TYPE – SEGMENTAL
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Continued screening of the bridge options, with pre-determined evaluation criteria
• Maintenance
• Environmental Footprint (foundations)
• Staging/Construction impacts
• Construction duration
• Constructability
• Cost
• Other risk factors
BRIDGE ALTERNATIVES EVALUATION
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
For this location, the Segmental Concrete bridge type is disadvantaged in many areas:
• Staging (large area needed)
• Contractor experience
• Cost
• Maintenance
Recommend elimination of this bridge type
REMAINING BRIDGE TYPES
Factors in decision-making for
remaining girder/slab bridge
types.
• Optimizing the # of foundations
• Ice load capacity (ability to
withstand ice impacts)
• Cost
• Constructability
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
Ice loading is considered to be the key factor behind previous
damage that caused bridge closure:
• Water levels of Lake Francis Case can vary by more than 20 feet in
a year
• Spring thaw causes thick ice to move downstream
• Rising water levels make the exact impact elevation uncertain
• Ultimately, this factor could provide incentive for slightly longer
spans
WHAT IS ICE LOADING?
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
ENVIRONMENTAL STUDY PATH AHEAD
• Conduct agency coordination for key issues:• Section 4(f)/6(f) with SDGFP
• Section 106 (Cultural Resources) with USACE
• Finish field studies in spring 2018
• Prepare Environmental Assessment
• Determine a Preferred Alternative and share it with the public for comment
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
PUBLIC INVOLVEMENT OVERVIEW
• One more set of public meetings anticipated for
this project (publication of the EA)
• Agency/Tribal Outreach
• Website (www.sd44bridge.com)
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
PROJECT SCHEDULE
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
PROJECT SCHEDULE
• In General, Four Phases• 1) Scoping & Data Collection (January – May 2017)
• Public Information Meeting #1 – May 22 & 23
• 2) Alternatives Development (May – Dec. 2017)• Public Information Meeting #2 – tonight
• 3) Select Preferred Alternative (Dec. ‘17 – Apr. ‘18)
• 4) Complete NEPA/Recommendations (Feb. – July 2018)• Public Information Meeting #3 – Summer 2018
SD44 / PLATTE-WINNER BRIDGE CORRIDOR STUDY AND EA
PLEASE LEAVE YOUR COMMENTS WITH US!
• Comment Forms are available
• Complete tonight, or send to us by January 3, 2018
• Visit web site for updates: www.sd44bridge.comProject Contacts
Tim Thoreen, PMP
HR Green
tthoreen@hrgreen.com
651-659-7777
Steve Gramm, PE
South Dakota Department of Transportation
steve.gramm@state.sd.us
605-773-6641
MARKET
Archeology
Laboratory
(Augustana)
SD44 / PLATTE-WINNER BRIDGE
CORRIDOR STUDY AND
ENVIRONMENTAL ASSESSMENTPUBLIC MEETINGS, DECEMBER 12-13, 2017
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