Stakeholders Working Group August 22, 2012 1
Project Update How we got New Information here 2
How we got here Need to fix bridge / Colorado Bridge Enterprise funding Environmental Assessment to determine best way to address this need 3
How we got here (cont.) Alternatives development and evaluation process to select best alternative Public input to understand issues and gain input 4
How we got here (cont.) Independent Peer Review Current Alternatives 1 and 3 5
Alternatives 6
Alternatives 7
Alternatives 8
Viewsheds – View to Downtown 9
Viewsheds – View from Hot Springs 3A & E 1A 1B 3D 10
Viewsheds – View from I-70 WB 3A & E 1A 1B 3D 11
Viewsheds – View from 7 th Street 1A 1B 12
Viewsheds – View from 7 th Street 3A & E 3D 13
Bicycle Pedestrian Options 14
Bicycle Pedestrian Options Alternative 3A 15
Bicycle Pedestrian Options Alternative 3E 16
Bicycle Pedestrian Options 17
Traffic Simulations 18
Other Considerations 19
Next Steps 20
THANK YOU for attending the Public Open House 21
Background Informationi 22
Project Schedule If the project receives the federally required approvals, construction would begin in late 2014. Tasks 2011 2012 2013 2014 Initiation & Feasibility Alternatives NEPA Documentation Design Construction Start 23
Alternatives Screening Process 24
Level 2 Screening Criteria Purpose & Need Criteria Additional Criteria Additional Criteria (continued) Design and Feasibility Community Purpose & Need Element #1: Improve Connectivity Relative cost of alternative Relative harmony with community Between Downtown and Hot Relative ability of alternative to meet design Consistent with City Planning Springs standards For Through Traffic Relative ability to reduce and minimize construction impacts Relative ability to construct Purpose & Need Element #2: Relative ability to minimize private property impacts Environmental Address Functional, Structural, Emergency Service, Reliability Relative ability to incorporate sustainable elements into Relative impacts to historic resources design Relative ability to minimize risk of Visual/aesthetics - General-from river, pool, etc. bridge closure Transportation Relative ability to address Visual/aesthetics - Cooper and/or Colorado Relative ability to safely accommodate transportation users structural deficiencies Visual/aesthetics - Grand Avenue Relative ability to reduce and minimize construction impacts Relative ability to improve emergency access Relative noise and air quality impacts Relative ability to maintain and improve multimodal Relative ability to address connections Relative impacts to parks and recreation resources functional deficiencies Relative ability to maintain or improve transportation Relative impacts to water and aquatic resources Relative bridge life operations 25
Phasing Possibilities and Options Outside – Inside Concept Under this phasing option, new bridge supporting structures would be built to the outside of the existing bridge, leaving 4 lanes on the existing bridge during most of the construction period. Once the outer supporting structure is completed, the driving surface of the new bridge would be filled in either incrementally or during a full closure (+/- 1 month). The existing bridge would ultimately be removed. 26
Phasing Possibilities and Options Half – Half Concept 27
Phasing Possibilities and Options Slide-in Concept Prefabricated bridge parts are built off site but nearby, and slid into place. Prefabricated Slide in Unit Spans 28
Phasing Possibilities and Options Slide-in Concept Phase 1 Phase 2 Remove existing bridge Build superstructure to west on falsework Build new columns under existing bridge Slide new superstructure onto new columns 29
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