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Final Location Hydraulic Report June 2009

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FINAL LOCATION HYDRAULIC REPORT Anna Maria Island Bridge Project Development and Environment Study SR 64 (Manatee Avenue) From SR 789 (East Bay Drive) to Perico Bay Boulevard Manatee County, Florida Financial Project ID: 424436-1-21-01 Prepared for: Florida Department of Transportation District Environmental Management Office 801 North Broadway P.O. Box 1249 Bartow, FL 33831 June 2009 FINAL LOCATION HYDRAULIC REPORT Anna Maria Island Bridge Project Development and Environment Study SR 64 (Manatee Avenue) From SR 789 (East Bay Drive) to Perico Bay Boulevard Manatee County, Florida Financial Project ID: 424436-1-21-01 Prepared for: Florida Department of Transportation District Environmental Management Office 801 North Broadway P.O. Box 1249 Bartow, FL 33831 Prepared by: 482 S. Keller Road Orlando, Florida 32810 June 2009 EXECUTIVE SUMMARY The Florida Department of Transportation (FDOT) is conducting a Project Development and Environment (PD&E) Study for improvement alternatives along SR 64 (Manatee Avenue), from west of SR 789 (East Bay Drive) to east of Perico Bay Boulevard in Manatee County, Florida. The Anna Maria Island Bridge, constructed in 1957, is one of three bridge facilities that provide vehicular access over Anna Maria Island Sound/Gulf Intracoastal Waterway to and from Anna Maria Island. The PD&E Study evaluates alternatives to address the problem of the deteriorating bascule bridge on SR 64 (Manatee Avenue), the most northerly access, which is a designated evacuation route. The purpose of the PD&E Study is to provide documented environmental and engineering analyses to assist FDOT and the United States Coast Guard (USCG) in reaching a decision on the type, location and conceptual design of the necessary improvements. Bridge inspection reports have shown that the Anna Maria Island Bridge is functionally obsolete. The structural condition is anticipated to deteriorate further as the bridge surpasses its service life of 50 years. Substandard geometry such as the lack of shoulders, 9-inch (in) wide concrete curbs separating the travel lanes from the sidewalk and obsolete bridge railing contribute to the functional obsolescence of the existing structure. Viable improvement alternatives considered for this facility include rehabilitation and replacement of the current bridge. The development of a new corridor would result in significant social and environmental impacts, and would not address the problem of the deteriorating SR 64 (Manatee Avenue) bridge. Therefore, developing a new corridor or improving a parallel roadway is not an option for this project. Three general bridge replacement alternatives were evaluated for this PD&E Study: • Alternative 1 − Low-Level Bascule: This concept proposes building a new bascule bridge with a minimum vertical navigational clearance of 21 feet (ft) above mean high water (MHW) when the bascule leaves are lowered. This is the established vertical guide clearance set by the USCG. • Alternative 2 − Mid-Level Bascule: This concept proposes a replacement bascule bridge with a navigation clearance of 45 ft. Based on data provided by the bridge tender at Anna Maria Island Bridge and allowing for tidal fluctuations, this height would allow approximately 39 percent of the waterway users that currently require the bridge to open to pass without an opening. • Alternative 3 – High-Level Fixed-Span: This concept proposes a high-level fixed-span replacement bridge over the existing Gulf Intracoastal Waterway navigation channel. The vertical navigational clearance will be 65 ft. Based on data provided by the bridge tender at the Anna Maria Island Bridge and allowing for tidal fluctuations, this height would allow greater than 99 percent of boats that currently require the existing bridge to open to safely navigate under the proposed structure. A tunnel was also evaluated but found to be non-viable. Anna Maria Island Bridge PD&E Study Final Location Hydraulic Report i Bridge replacement alignment alternatives to the left, center and right (north, center and south) of the existing bridge were considered. A centered alignment would conflict with the existing bridge, and traffic could not be maintained on the existing bridge during construction. Therefore, the centered alignment was eliminated from further consideration. The combination of three bridge types and two alignments (northern and southern) result in six viable bridge replacement alternatives. Additionally, two proposed two-lane undivided bridge typical sections are being considered for all of the bridge replacement alternatives in this study. Both typical sections include two 12-ft lanes and two 10-ft shoulders which can accommodate bicyclists and disabled vehicles. Typical Section A includes one 12-ft sidewalk along the north side of the bridge, separated from the shoulder by a concrete barrier wall. A 4.5-ft high pedestrian/bicycle railing will be provided on the outside of the 12-ft sidewalk. There will be no sidewalk on the south side. Typical Section B includes a 10-ft sidewalk along both the north and south sides of the bridge. The designations “A” and “B” have been added to the alternative names accordingly. All of the bridge replacement alternatives are within the coastal floodplain and are subject to flooding to some degree due to tidal storm surges. All bridge replacement alternatives will have some minor impact to the floodplain but flood elevations and risks will not be increased due to the changes in vertical or horizontal alignments presented in this study. Anna Maria Island Bridge PD&E Study Final Location Hydraulic Report ii TABLE OF CONTENTS Section Title Page EXECUTIVE SUMMARY .................................................................................. i TABLE OF CONTENTS....................................................................................iii LIST OF FIGURES .............................................................................................v 1.0 INTRODUCTION ............................................................................................. 1-1 1.1 Purpose................................................................................................... 1-1 1.2 Project Description.................................................................................1-1 1.3 Project Need........................................................................................... 1-3 2.0 ALTERNATIVES CONSIDERED................................................................... 2-1 2.1 Corridor Analysis................................................................................... 2-1 2.2 No-Build Alternative............................................................................. 2-1 2.3 Transportation Systems Management Alternative................................. 2-1 2.4 Rehabilitation Alternative...................................................................... 2-2 2.5 Bridge Replacement Alternatives .......................................................... 2-2 2.5.1 Typical Sections................................................................... 2-2 2.5.2 Horizontal Alignments......................................................... 2-5 2.5.3 South Alternative................................................................. 2-5 2.5.4 North Alternative................................................................. 2-5 2.5.5 Bridge Type......................................................................... 2-8 2.6 Proposed Bridge Replacement Alternatives ......................................... 2-11 2.6.1 Alternative 1BN – Low-Level Bascule, Typical Section B, North Alignment .................................. 2-11 2.6.2 Alternative 1BS – Low-Level Bascule, Typical Section B, South Alignment .................................. 2-13 2.6.3 Alternative 2BN – Mid-Level Bascule, Typical Section B, North Alignment .................................. 2-14 2.6.4 Alternative 2BS – Mid-Level Bascule, Typical Section B, South Alignment .................................. 2-15 2.6.5 Alternative 3BN – High-Level Fixed-Bridge, Typical Section B, North Alignment .................................. 2-16 2.6.6 Alternative 3BS – High-Level Fixed-Bridge, Typical Section B, South Alignment .................................. 2-17 Anna Maria Island Bridge PD&E Study Final Location Hydraulic Report iii P:\Projects\FDOT\D1\Anna_Maria_Bridge\Reports\LHR\Final LHR\Final for Production\FINAL_LHR_June2009.doc TABLE OF CONTENTS (CONT.) Section Title Page 3.0 ANALYSIS OF FLOODPLAIN IMPACTS ..................................................... 3-1 3.1 Project Setting and Land Use................................................................. 3-1 3.2 National Flood Insurance Program Communities.................................. 3-1 3.3 Floodplains............................................................................................. 3-6 3.3.1 Floodplain Impacts Mid and Low-Level Alternatives......... 3-6 3.3.2 Floodplain Impacts High-Level Alternative ........................ 3-6 3.3.3 Other Cross Drains.............................................................. 3-10 3.3.4 Stormwater Management Facilities .................................... 3-10 4.0 STUDY REQUIREMENTS.............................................................................. 4-1 4.1 Discussion.............................................................................................. 4-1 4.2 Items to be Addressed............................................................................ 4-1 4.2.1 Items Regarding Floodplain
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