02 Bond Bridges Presentation — original pdf

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Urban Transportation Commission – Bond Bridges Update Agenda 1 Barton Springs Road Bridge 2 Redbud Trail Bridge 3 William Cannon Road Overpass 4 Wishbone Bridge 2 2 Barton Springs Road Bridge 100 years old built in 1926 1946 Bridge Expansion 20,000 Vehicles per day Key Entrance to Zilker Park and for Major City Events FUNDING SOURCE: • Preliminary Design: 2012, 2018 and 2020 Bonds • Design: 2020 Bond • Construction: FHWA/City 3 City Council Actions 1 Direction from Council in 2020 Bond Resolution (20200812-011): 2 Previous Council Action/Hearings: 11/30/23 – Council conducts a public hearing to recommend the bridge replacement alternative 12/12/23 – Council work session on the recommended option 12/14/23 – Council conducts a public hearing and directs Staff to pursue replacement option 03/07/24 – Council Directs TPW Director to apply for a federal bridge grant to replace the bridge 05/02/24 – Council approves additional engineering services for the bridge replacement 04/24/25 – Council approves accepting $32M in grant funds from the FHWA for bridge replacement 4 Project Development Process PRELIMINARY PHASE 2015 - 2023 DESIGN PHASE 2024 - 2027 CONSTRUCTION PHASE 2027 - 2029 PUBLIC MEETING April 2023 RESPOND TO COMMENTS Summer 2023 REFINE REPORT Fall 2023 COUNCIL ACTION December 2023 60% DESIGN + NEPA PUBLIC MEETINGS + BOARDS AND COMMISSIONS FINAL DESIGN AND PERMITTING BID AND AWARD + COUNCIL ACTION CONSTRUCTION WE ARE HERE Analysis Structural and Mobility Analysis: • • • • External Structure - Spalling Concrete • ADA compliance – Pedestrian Circulation Internal Structure – Deteriorating Steel Geotechnical Data –Replacement Design • Pedestrian and Bicycle Mobility – no improvement to existing condition Cost/Benefit Analysis – extended life vs. cost Historic Analysis: • Coordinated with US Army Corps (USACE) and Texas Historic Commission (THC) • The bridge is a contributing feature to the Zilker Park Historic Landmark designation • The Texas Historic Commission has approved potentially fully replacing the bridge. As the process continues, the final design will be reviewed and approved by USACE and THC. 6 Current Condition Spalling Concrete in Bridge Structure Concrete Cores Delamination of Beams Curb And Railing Do Not Meet Current ADA Standards Load Restricted As Of November 2023 – Heavy Vehicles Moving Eastbound Must Use Outer Lanes 7 Project Options 8 Bridge Rehabilitation Bridge Structure Rehabilitation 1 Remove Existing Bridge Deck and Spandrel Columns 2 Remaining Portion of Existing Structure 3 New Components: Exterior Pairs of Arch Ribs, Spandrel Columns, Deck, and Abutment Extensions Less than half of the original structure will remain  Remaining structure will require refacing with new material surfaces  View of old arches will be mostly blocked by new structure 9 New Bridge Features Bike Lanes Sidewalk / Path Shared Use Path Proposed Bridge  Widened Bike Lane  Accommodate off-road biker trail users  Accommodate hiking Trails  Wider Ped. Paths  Accommodate Pedestrians for Special Events  Multimodal areas to accommodate off-road hike and bike trail users  Longer service life length  Wider bridge  Better alignment for safety  Dedicated bike lanes 10 Next Steps • Initial reviews from THC and USACE indicate replacement as a viable alternative • As the project moves through NEPA process, all jurisdictional agencies and departments will review accordingly: • Texas Historic Commission • US Army Corps • COA Permitting: • City of Austin Development Services • Boards & Commissions (Environmental, Mobility, Parks, Landmarks, etc.) • Community Outreach • Project received Federal Highway Administration Bridge Improvement Program grant for $32M. • Anticipated NEPA clearance at the end of 2026, bidding in 2027 11 Example of a Bridge Replacement - Before 12 Example of a Bridge Replacement - After 13 Redbud Trail Bridge 78 years old built in 1948 No Shoulders 3’ Single Sidewalk Utility Corridor Houses 8 separate utility lines Existing Rails are Obsolete 14 Original Project Scope & Cost Total Project Cost = $130M Funding Need = $77M 15 Existing Bridge Conditions In late 2025, a Structural engineer was hired to perform a bridge assessment…. - Bridge deck and sidewalk in good condition, with small localized spalls and cracks - Existing Steel Superstructure lifespan ≈ 90 - years Substructure (Abutments and Bents) are in satisfactory condition Conclusion: By performing bridge repairs and proper maintenance, this bridge’s service life can extend for an additional 50 years. Concrete Cracks in Abutment Wingwall 16 Potential Improvements  Make suggested repairs to the superstructure, substructure and approaches  Widen existing bridge to better accommodate bicycle and pedestrian traffic  Improve bicycle and pedestrian connectivity between Red Bud Isle Park and Lake Austin Boulevard as feasible within existing ROW 17 Wishbone Bridge 18 Project Background Bridge:  Provides connectivity to trail users as well as commuters  Structure configuration and name result of public feedback  Features:  Dark sky compliant lighting  Center pergola with shade coverings  Planters, benches, bike racks, trash receptacles 19 Project Background Unity Underpass:  16’x 30’ structure replaces 5x7 box culvert  Provides connectivity between Butler Trail and Roy G Guerrero Park  Public Art Installation – AIPP funded 20 Project History PUBLIC PROCESS Nov 2018 1st Public Meeting Jun 2019 2nd Public Meeting Dec 2019 3rd Public Meeting Mar 2022 Virtual Public Meeting DELIVERY TIMELINE Preliminary Engineering 2018–2020 Design Launch 2021 Design Development 2022 Permitting & Procurement 2023–2024 Construction 2024–2025 Jul 2018 Begin Preliminary Engineering Mar 2020 Preliminary Engineering Complete Nov 2020 2020 Bond Passes Mar 2021 Council Approves RL for Add Alternates May 2021 Design Begins Nov 2021 30% Plans Submitted Jun 2022 60% Plans Submitted Aug 2022 AIPP Open Call Oct 2022 90% Plans Submitted May 2023 100% Plans Submitted Dec 2023 Construction Permit Received Apr 2024 Council Approves Construction Contract Jun 2024 NTP Issued Dec 2025 Substantial Completion Reached 21 Project Background By the numbers:  Design Duration = 35 months  Construction Duration = 18 months  Construction Contingency used = 1% 22 QUESTIONS & ANSWERS 23