Marlin Engineering, Inc. - Laserfiche WebLink

Home Browse Search

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engineering Services for Government Infrastructure RFQ No_ 07-03-01 1.3 Need For the Project -e No existing connection at this location exists over the finger canal providing north- south connection in addition to the already congested Collins Avenue. The proposed North Bay Road Pedestrian/Bike and Emergency Vehicle bridge will connect the southern end of North Bay Road, just south of 174th Street, to the south bank of the canal, with a pedestrian section continuing south to 172nd Street. The bridge will provide a much needed alternate north-south connection within the City. The ultimate design will be for a two- lane, two way facility with sidewalks for the entire project length. At this time the usage of the facility will be for pedestrians, bicycles and emergency vehicles; regular vehicular traffic is precluded due to a total available width of only 20' at the south end of the project where right of way is restricted to a 20' easement. Future considerations should evaluate the acquisition of the required right of way on the south end to fully convert this facility into a full fledged vehicular traffic structure. This pedestrian facility will be connected to a proposed Town Center Park Observation Deck and Boardwalk providing pedestrian connectivity from the Town Center Park located adjacent to Collins Avenue into the proposed pedestrian bridge while providing a scenic element to the users. 1.4 Alignment Horizontal: The City of Sunny Isles Beach envisions a pedestrian bridge providing connectivity as described in the "Need for the Project" section although the conditions for the alignment are not ideal given that the approach locations do not align along a tangent line. An alignment must be set on the western side of the right of way line which delineates the southeast boundary of the 20 feet easement on the southern approach. There is an existing building that abuts the 20 feet easement, being this approach the controlling point for the layout of the alignment. The approach at the northern bank the available right of way width is 50 feet and the conditions for the approach are adequate for a smooth landing. Vertical: The City's request is to construct a pedestrian bridge to expand the canal, landfall to landfall. The vertical alignment presents a challenge, as different permitting agencies will require minimum clearances over the waterways. In order to satisfy the requirements of the permitting agencies and comply with American with Disabilities Act (ADA) a delicate balance must be achieved in the design of this structure in order to satisfy all applicable criteria. A more detailed description will be depicted under the "Technical Approach and Implementation" section. 1.5 Environmental Issues Vegetation: A preliminary vegetation survey of the project area has been conducted. The mangrove dominated littoral zone consists of red (Rhizophora mangle), black (Avicennia germinans) and white mangroves (Laguncularia racemosa). These mangroves lie within the littoral zone waterward of the mean high water line, but landward of the mean low water line. Red mangrove is the dominant species, encompassing approximately 75% of the mangrove canopy. White and black mangroves make up the remaining 15% and 10% of the mangrove canopy, respectively. The average height of these mangroves is approximately 20 ft, with new growth ranging 1 to 3 ft and taller trees exceeding 30 ft. Above the mean high water line where mangroves do not dominate the area, a few upland species are present. The southern limit of the vegetation is located at the fence bordering the Salem House property. Photographs of the area are provided below. >-- .1 PROPOSED PEDESTRIAN BRIDGE LOCATION I ~~~~,