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Context Sensitive Case
Study: Grand Avenue Bridge
July 1, 2014
MODERATOR: Craig Gaskill, TSH Engineering
Joe Elsen, Colorado Department of Transportation - DOT Perspective / Client
Brian Pettet, Pitkin County - Pitkin County, Director of Public Works, Key Stakeholder Perspective
Jim Clarke, Jacobs Engineering – Environmental Manager Perspective
Richard Henderson, Granite Construction – Contractor Perspective
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Background and History
Project Need The CSS approach
Use of an EA Use of CM/GC as
delivery method
Why the CSS Process?
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Why the CSS Process?
Regional Context
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Why the CSS Process?
Project Vicinity
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Project Vicinity
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Project Need
Why the CSS Process?
1. Improve connectivity between downtown Glenwood Springs, and the Roaring Fork Valley, with the historic Hot Springs pool area and I-70.
2. Address the functional and structural deficiencies of the bridge to improve public safety, including emergency service response, and reliability as a critical transportation route.
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•Well known problems both structurally and functionally - but technically safe.
Why the CSS Process?
Project Need
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8 Existing Bridge Pier Scour
Existing Bridge Scour Analysis Report: “. . .the bridge is scour critical due to the bridge foundations being unstable for calculated scour conditions. . . .”
Why the CSS Process?
Project Need
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Why the CSS Process?
History and Travel Patterns 1998 bridge
funding Traffic
growth
Project History
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Use of an Environmental Assessment for NEPA Clearances
Use of CM/GC as Project Delivery Method
•I-70 CSS and Community Context
Why the CSS Process?
Other Elements of the Process
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At project initiation, CDOT opted to use a CSS process • CDOT CSS Guidance • I-70 Mountain Corridor CSS Process
CSS process geared toward engaging varied interests, including: • downtown business • bike/ped • tourists/visitors • rafting community • commuters
•I-70 CSS and Community Context
Why the CSS Process?
CSS Process Used
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CSS Process driven by other challenges
• Tightly Constrained
• Highly Visible
• Highly Aesthetic Environment
Why the CSS Process?
CSS Process Used
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•I-70 CSS and Community Context
Why the CSS Process?
Project Leadership Team (PLT) established, comprised of stakeholders to oversee process
CSS Process Used
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•I-70 CSS and Community Context
The PLT
Being on the PLT–View of the Process Development
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The PLT
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Improve connectivity between downtown Glenwood Springs and the Roaring Fork Valley, with the historic Hot Springs pool and I-70.
“the bridge’s condition impairs this connection for a variety of transportation users.”
“Future traffic increases will worsen the bridge’s ability to provide connectivity.”
The EA
Purpose and Need
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Project Leadership Team developed Context Statement & Critical Success Factors. These items led to project criteria/MOEs Criteria used to evaluate alternatives.
The EA
Context Statement
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The Grand Avenue bridge, over the Colorado River, Interstate 70, and the railroad tracks, connects north and south Glenwood Springs, I-70, and State Highway 82, and the historic districts of downtown and the Glenwood Hot Springs. The bridge stands as a gateway to the city of Glenwood Springs, Glenwood Canyon, the Roaring Fork Valley, and Colorado’s western slope communities. It serves local, regional, and state travel; local commuters; emergency response; bicyclists and pedestrians. The soaring walls of Glenwood Canyon, the rich history of Glenwood Springs built at the confluence of the Colorado and Roaring Fork Rivers, mining, tourism, and recreation define a splendid and vivid context for the Grand Avenue bridge.
Context Statement and Critical Success Factors
The EA
Context Statement
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Meet current design standards Safety Pedestrian, bicycle, and ADA access Iconic structure Promote appropriate speeds Connection to 6th Street Minimize construction impacts Solve problems into the future Provide for activities and vibrant street life under the bridge Avoid and minimize environmental impacts Accommodate traffic flow and demand
and Critical Success Factors
The EA
Critical Success Factors
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Design for sustainability Looks like it grew out of the history of Glenwood Springs Positive economic impact, short and long term Invigorates activity on Wing Street Accommodates traffic flow on I-70 Maintain and enhance recreation on the river Affordable Doesn’t impact aquifer and hot springs Source of community pride Engaged public and community
and Critical Success Factors
The EA
Critical Success Factors
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Scoping Meetings held with public and agencies Helped identify issues to be included in alternatives
evaluation & EA
Historic Hot Springs Lodge and Pool
The EA
Project Scoping
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The EA
Project Scoping – Historic Properties
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The EA
Project Scoping – Historic Properties
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The EA
Project Scoping – Historic Properties
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The EA
Project Scoping – Historic Properties
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The EA
Project Scoping – Historic Properties
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The EA
Project Scoping – Historic Properties
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The EA
Project Scoping – Geothermal
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The EA
Construction impacts
Traffic congestion Lack of
transportation redundancy
Project Scoping
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•I-70 CSS and Community Context
The CM/CG Process
Bringing in the Contractor During the EA Process
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•I-70 CSS and Community Context
The CM/CG Process
Supports CSS Process: • Helps in development of alternatives and
options • Helps in better evaluating alternatives and
options • Helps collaborative decision making • Helps contractor recognize community context
and character prior to construction • Better supports multi-discipline, multi-interest
process
Bringing in the Contractor During the EA Process
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•I-70 CSS and Community Context
The CM/CG Process
Bringing in the Contractor During the EA Process • Contractor perspective of coming into the CSS process while the EA was being developed
• Contractor involvement in the Grand Avenue Bridge CM/GC process:
• allows for highly innovative process through 3 party collaboration
• provides for inherent VE allowing for enhanced constructability - Design can be tailored to construction method
• reduces risk of innovation • Contractor has better understanding of what outside factors
contributed to design and will be able to better accommodate during construction
• better defines scope of the project • provides better environmental stewardship • better address third party concerns. • Provides resource for owner/designer when weighing out
different options under consideration
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – The Many Challenges
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Challenges & Opportunities
Working out the Details – Proposed Action
(Summary)
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Challenges & Opportunities
1979 Bypass Alignment
Working out the Details – Competing Needs for the Funding
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – The Role of Elected Officials
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•I-70 CSS and Community Context
Challenges & Opportunities
Match
Match
Working out the Details – How Travel Patterns Influence Alignment
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – How the Bridge Incorporated a New Roundabout
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Utility relocations CDOT Bike and Pedestrian Policy Directive 1602.0 Historic use of Grand Avenue Bridge Current width of pedestrian bridge Potential to improve pedestrian and bicycle connections Clearances to future I-70 eastbound acceleration lane Existing grade on
pedestrian bridge Aesthetics Mitigation Context Sensitive
Solutions (CSS) Cost
•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – How the Bridge Incorporated a New Pedestrian Bridge
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – How the Bridge Incorporated a
New Pedestrian Bridge
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•I-70 CSS and Community Context
Challenges & Opportunities
•Section to be Developed – Craig Midland Avenue capacity during detour
Working out the Details – CARmageddon, Glenwood Springs Style
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – The Role of Models – Some Work for “the Public”
and some Don’t
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – Access Control Plans and Bridge Width
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – Americans with Disabilities Act (ADA)
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – Public Input into Design Detail
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•I-70 CSS and Community Context
Challenges & Opportunities
Metaphysics (Natural Sciences)
Ethics (Social Sciences)
Aesthetics (Arts)
Truth The Good
Beauty
Working out the Details – The Role of Aesthetics in Finding a Solution
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•I-70 CSS and Community Context
Challenges & Opportunities
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•I-70 CSS and Community Context
Challenges & Opportunities
Historic Impacts • Working closely
with Historic Preservation Groups
• Creative Mitigation (e.g. transparent noise barriers, railroad history documentation)
Working out the Details – Historic Impacts
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•I-70 CSS and Community Context
Challenges & Opportunities
Economic/Transportation • Construction-related impacts • Pedestrian access across river during approx. 2-month
full bridge closure • ABC techniques to minimize full bridge closure
Visual • New pedestrian bridge and roundabout would create a
visual gateway and sense of entry into Glenwood Springs.
• Structure type for new pedestrian bridge will not obstruct ridge & mountain views
Working out the Details
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•I-70 CSS and Community Context
Challenges & Opportunities
Water Resources/Aquatic • Temporary river impacts from construction causeways • Construction staging to avoid & minimize effects to
spawning trout • Preventative measures to avoid construction impacts to
geothermal • Removal of invasive species in riparian areas and
revegetation with natives
Working out the Details
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Challenges & Opportunities
• Funding constraints related to the Colorado Bridge Enterprise funding
Colorado Bridge Enterprise bridges (partial map)
Working out the Details – Funding Constraints
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – Keeping the “Hot” in Glenwood Hot Springs
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – Detours and New Bridges
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – Working with and on top of UPRR
• Approximately 20 trains per day (Freight and Passenger) • Project will require intimate interaction with the UPRR • Able to leverage contractor’s previous relationship to develop a crossing plan
• Initial location was selected based on preferred location by contractor – UPRR did not like location proposed
• We were able to jointly develop a location that met our needs and satisfied UPRR concerns with minimal impact to construction operations
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•I-70 CSS and Community Context
Challenges & Opportunities
Working out the Details – Working with and on top of UPRR
• Project will require us to “Slide” the bridge over the UPRR tracks
• Due to involving the contractor early we were able to bring UPRR representatives to the site and explain the process in a more relaxed environment
• Were able to address their concerns and incorporate in to the project requirements
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• Rafters affected river access options • Hot Springs Pool affected river
access options • Tourist season added time
constraints to project • Volume of motorists/pedestrians
dictated additional scope and added constraints
Working out the Details – How Visitor Use Affected Construction Plans
Challenges & Opportunities
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Working out the Details – Construction Phasing and Lack of Redundancy
Challenges & Opportunities
Lack of redundancy of utilities on existing bridge required that they be relocated first
Linear phasing added to project duration During design we were able to identify some
items that could be changed in order to save duration while still meeting stake holder needs
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Balancing the needs of construction while accommodating the river users and adjacent businesses
Time constraints due to visitors, fish spawning seasons and river flow
Historic property constraints Tight space constraints
Working out the Details – Construction Challenges
Challenges & Opportunities
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•I-70 CSS and Community Context
Lessons Learned
NEPA – Jim Clarke PLT (Key Stakeholders) – Brian
Pettet Design – Craig Gaskill Contractor – Rich Henderson Client – Joe Elsen
From Various Perspectives
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•I-70 CSS and Community Context
Q&A