San Martin Boulevard over Riviera Bay Project Development & Environment (PD&E) Study Update PID A

Transcription

1 San Martin Boulevard over Riviera Bay Development & Environment (PD&E) Study Update PID A June 12, 2018

2 Location & Limits Unincorporated Pinellas County City of St. Petersburg 2

3 Overview Of Alternatives No Build Alternative Alternatives Considered but Eliminated Rehabilitation / Widening Alternative Alternative High-Level and Mid-Level Fixed Span Alternatives Does not meet current design high water clearance elevations Existing bridge condition and unknown foundations not conducive to widening Significant impacts to surrounding environment and community Significant impacts to adjacent street networks Concerns with existing channel depth, canal width and dockage space Movable Bridge Alternative Significantly higher construction cost than fixed alternatives Increased long-term maintenance and operational costs Proposed Build Replacement Alternatives Left-shifted (West) Alignment Centered Alignment Right-shifted (East) Alignment Highest Feasible Profile Reconstruction Alternatives (Fixed Bridge) Improves navigational clearances Eliminates impacts to adjacent neighborhoods 3

4 Build Replacement Alternatives WEST ALIGNMENT CENTER ALIGNMENT EAST ALIGNMENT Weedon Island Weedon Island Weedon Island 4 Stakeholder Preferred Alternative

5 North Bay Trail Extension Evaluation Stakeholder Preferred Alternative 5

6 Alternatives Comparison Matrix 50 ±19 Alternative Cost Service Life No-Build / Rehabilitation NR* N/A West Alignment $ M 75 years Center Alignment $ M 75 years East Alignment $ M 75 years Stakeholder Preferred Alternative * Not recommended due to unknown foundations and existing bridge condition. 6

7 4 th St. N. Sea Level Rise Base Conditions (0 Inundation) End Weedon Island Begin Riviera Bay Renaissance 7

8 4 th St. N. Sea Level Rise Base Conditions (1 Inundation) End Weedon Island Impacts to Low Lying Natural Areas Begin Riviera Bay Renaissance 8

9 4 th St. N. Sea Level Rise Base Conditions (2 Inundation) End Impacts to San Martin Blvd. Weedon Island Begin Riviera Bay Renaissance Impacts to Residential Neighborhoods 9

10 4 th St. N. Sea Level Rise Base Conditions (3 Inundation) End Significant Impacts to San Martin Blvd. Weedon Island Begin Riviera Bay Renaissance Significant Impacts to 83 rd Ave. 10

11 4 th St. N. Sea Level Rise Base Conditions (4 Inundation) End Loss of Connectivity on San Martin Blvd. Weedon Island Begin Riviera Bay Renaissance Impacts to Streets 11

12 4 th St. N. Sea Level Rise Base Conditions (5 Inundation) End Regional Roadway Impacts Weedon Island Begin Riviera Bay Renaissance Regional Impacts to Neighborhoods 12

13 4 th St. N. Sea Level Rise Base Conditions (6 Inundation) End Weedon Island Significant Regional Impacts Begin Riviera Bay Renaissance 13

14 Sea Level Rise (LSML) Sea Level Rise ions Summary 7 6 >7 Duke Energy Power Plant Inundation Impacts to Riviera Bay Lots NOAA SEA LEVEL RISE PROJECTIONS (2012) 5 BRIDGE 75 YEAR DESIGN LIFE ~3.6 Inundation Impacts to Renaissance Lots ~3.3 Inundation Impacts to Riviera Bay Streets ~2.0 Inundation Impacts to San Martin Blvd. ~1.5 Inundation Impacts to 83 rd Ave. Low Int. Low Int. High High Begin Impacts to San Martin Blvd > Elevation Data from : NOAA Office for Coastal Management Coastal Inundation Digital Elevation Model: Aggregate Record Publication Date: Year 14

15 Current Status Construction Schedule Construction funding proposed in Penny IV Stakeholder Preferred Alternatives: Eastern Bridge Alignment Eastern Trail Alignment Pinellas BCC work session SLR Presentation & Update June 12, 2018: Recommendation to finish PD&E Study with Stakeholder Preferred Alternative. 15