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<br />. <br /> <br />. <br /> <br />. <br /> <br />,~. North Bay Road Pedestrian/Emergency Vehicle Bridge and Town Center Observation Deck & Boardwalk <br />"U', <br /> <br />2. PEDESTRIAN / EMERGENCY VEHICLE BRIDGE <br /> <br />2.1. <br /> <br />PROJECT ISSUES FOIl. BRIDGE <br /> <br />The current geometric environment of the project offers several challenges lI'om a bridge development <br />perspective that has to be addressed carefully in a methodical process. <br /> <br />. Variable Horizontal Geometry <br />. Vertical Clearance (Low Prolile/at grade) <br />. Ease of construction <br />. No right of way acquisition. <br /> <br />2.].]. Span Configuration <br /> <br />The first challenge is the span configuration. From our observation, the perpendicular channel <br />width at the proposed crossing is approximately one hundred feet. Close attention to the travel <br />way alignment requirements yield a skewed span arrangement of approximately 30 to 40 degrees. <br />This of course increases the span length to approximately one hundred thirty feet. As the span gets <br />longer the span depth requirements get deeper. Given that the requirements are that this bridge <br />crossing be at grade: as a result, it stands to reason that the alignment requirements will have an <br />affect on vertical clearance. Understanding that the approaches to the bridges are set by right of <br />way and travel way constraints, two options here considered for the span arrangement: <br /> <br />. Multiple Spans <br />· Single Span <br /> <br />Multiple Span Conti2;uration <br />The following are the benelits of a Multispan configuration: <br /> <br />· Would result in the most economical short term cost solution. <br />· Ease of construction. <br /> <br />Multi Span would have the following disadvantages: <br /> <br />· Introduction of structures into water <br />· Multi-span bridge represents multiple joints; as a result adds to maintenance cost. <br /> <br />Sin2;le Span Confi2;uration <br />A single span configuration offers several opportunities for this site. Mainly: <br /> <br />· Improved Aesthetic. <br /> <br />· Increased Safety (No obstructions to the channel for recreational users) <br /> <br />Request for Qualifications No. 07-03-01 <br /> <br />Page 5 of 15 <br />