HomeMy WebLinkAboutPW US 101-I-580 Multimodal and Local Access Improvement Project PPTI-580 Interchange Proof of Concept Study City of San Rafael November Council Meeting November 7, 2022 I-580 Interchange Proof of Concept Study2 Interchange Concept Study Background ➢Problem/Purpose of Study •Provide additional/alternate access to/from East San Rafael •Address congestion on Bellam Blvd. •Provide additional evacuation route ➢Study initiated to evaluate an I-580 Interchange concept midway between Bellam Blvd. and Sir Francis Drake •Planning level study (10% Design) •Evaluation of right-of-way design considerations, environmental issues & cost •Traffic analysis is not part of the study •Did not evaluate other interchange concepts or locations ➢Coordination •With the Resilient Shore team •With City of San Rafael & County Supervisors I-580 Interchange Proof of Concept Study3 Concept Location KERNER BLVD KERNER BLVD CMSA FRANCISCO BLVD EAST HOME DEPOT I-580 Interchange Proof of Concept Study4 Concept Overview Proposed Interchange Location Extend and Connect Kerner Blvd KERNER BLVD Convert portion of Kerner Blvd (Between Bellam Blvd to Irene St) to two way traffic KERNER BLVD CMSA Close Existing EB I-580 Access to and from Bellam Blvd FRANCISCO BLVD EAST I-580 Interchange Proof of Concept Study5 New Route from Canal to RSR Bridge From Canal to RSR US-101/I-580 Multi-Modal and Local Access Improvement Project6I-580 Interchange Proof of Concept Study➢Standard “Diamond” interchange designed to Caltrans standards ➢Maintain centerline and profile of I-580 ➢Concept does not address sea level rise. Freeway stays at current elevation ➢Close existing Bellam Boulevard on-ramp to EB I-580 Interchange Concept Assumptions I-580 Interchange Proof of Concept Study7I-580 Interchange Proof of Concept StudyOn Retained Fill/Retaining Walls On Bridge Structure Interchange Concept Total Costs $270M -$300M Francisco Blvd. East I-580 Interchange Proof of Concept Study8 Right of Way Needs Full Acquisition –15 parcels Partial Acquisition –21 to 25 parcels I-580 Interchange Proof of Concept Study9 Interchange Concept –Findings Traffic, Design, & Constructability ➢Currently defined/approved land use and traffic plans do not support a new interchange ➢Leaving partial interchange at Bellam Blvd is likely not approvable ➢Significant design exceptions required from Caltrans and FHWA ➢Truck access to CMSA would be restricted by steeper grade (8%+) on Andersen Dr. I-580 Interchange Proof of Concept Study10 Interchange Concept –Findings Environmental ➢Wetland, habitat, and open space impacts for Kerner Extension and along Andersen Dr. ➢Substantial visual impacts from structures and retaining walls on both sides of I-580 ➢Longer travel distance to and from the Canal Neighborhood to access EB I-580 –potential environmental justice issue Right of Way ➢Substantial right of way impacts on both sides of the freeway •Realignment of Francisco Blvd. East •Realignment and steeper grades on Andersen •15 full acquisitions and 21 to 25 partial acquisitions Cost ➢Interchange concept is costly and unfunded (total costs $270M -$300M) ➢The proposed US-101/I-580 Multi-Modal and Local Access Improvement Project cost would increase for some connector ramp alternatives I-580 Interchange Proof of Concept Study11 Proof of Concept Study Conclusions ➢Land use and traffic studies by City of San Rafael would be needed to support a new interchange •Priority Development Area (PDA) –OBAG Grant Proposal ➢Impacts to Highway Operations -Close interchange spacing and freeway to freeway distances do not meet Caltrans/FHWA standards –difficult to be approved ➢Closing existing on/off ramps at Bellam Blvd. would be difficult to approve, may be of concern to the community and trigger environmental justice issues ➢Business, right-of-way, visual, and environmental issues –further evaluation needed ➢Interchange is very expensive and unfunded ➢An option to consider if a future study is initiated •Simple overcrossing over I-580 ➢Bellam improvements are being considered as part of 101-580 Multi-modal & Local Access Improvement Project US-101/I-580 Multi- Modal and Local Access Improvement Project Status Update I-580 Interchange Proof of Concept Study13 Alternatives Under Consideration US-101/I-580 Multi-Modal and Local Access Improvement Project13 US-101/I-580 Multi-Modal and Local Access Improvement Project14 Build Alternatives Cost Update Concept Design Speed (mph)Preliminary Cost(1,2,3) Alternative 2 45 $241M Alternative 3A 35 $192M Alternative 3B (Modified)35 $200M Alternative 6 45 $315M 1.In 2031 Dollars –Escalation to midpoint of duration of construction 2.Costs do not include additional Bellam improvements 3.35% Contingency Existing Funding includes: •$135M of Regional Measure 3 Funds •$16.5M of Measure AA Funds US-101/I-580 Multi-Modal and Local Access Improvement Project15 Project Summary Schedule Current Phase US-101/I-580 Multi-Modal and Local Access Improvement Project16 Future Public Outreach Activities ➢Stakeholder Working Group in early 2023 ➢Equity outreach and capacity building with the Canal Neighborhood ➢Coordination with City of San Rafael Community Development and Public Works ➢Environmental Scoping planned for 2023 US-101/I-580 Multi-Modal and Local Access Improvement Project17 Questions? US-101/I-580 Multi-Modal and Local Access Improvement Project18 BACKUP SLIDES US-101/I-580 Multi-Modal and Local Access Improvement Project19 Alternative 2 –Simms St Cost: $241M Design Speed: 45 mph Height: 25 to 45 Ft Vertical scale is exaggerated 10:1 US-101/I-580 Multi-Modal and Local Access Improvement Project20 Alternative 3A –“Low Speed A” Cost: $192M Design Speed: 35 mph Height: Up to 25 ft Vertical scale is exaggerated 10:1 US-101/I-580 Multi-Modal and Local Access Improvement Project21 Modified Alternative 3B with New Bellam Exit Cost: $200M+ Design Speed: 35 mph Height: Up to 22 ft US-101/I-580 Multi-Modal and Local Access Improvement Project22 Alternative 6 -Andersen Dr Mid-Way Vertical scale is exaggerated 10:1 ±60 Andersen DriveJacoby St ±90 Cost: $315M+ Design Speed: 45 mph Height: 60 to 90ft I-580 Interchange Proof of Concept Study23 Caltrans/FHWA Design Exceptions Design Exception Design Standard Proposed Design Interchange Spacing – Urban 1 Mile 0.79 Mile to Bellam 0.51 Mile to SFD Interchange Spacing – Freeway to Freeway 2 Mile 0.79 Mile Isolated Ramps Full access interchange No EB On-ramp at Bellam Profile Grade < 8 %>8% along Andersen Distance Between Successive Ramps 1000 ft 475’ between existing EB off at Bellam and New EB off Ramp to Intersection 400 ft EB Ramps to Andersen/New cross- road intersection = 250’ WB Ramps to Kerner/New cross- road intersection = 364’