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Ordinance amending the FY 2018/2019 Capital Improvements Project Budget; Amendment (Change order) No.1 to professional engineering and surveying services Contract with Kimley Horn and Associates for hydraulic analysis and agency coordination of Rock Island Road Bridge at Bear Creek in the amount of $38,400. Cost will be adjusted in Interlocal Agreement with Dallas County
Presenter
Romin Khavari, City Engineer; Gabriel Johnson, Director of Public Works and Walter Shumac, Transportation Director
Recommended Action
Approve
Analysis
In 2012, Dallas County engaged Kimley-Horn (KH) to provide a Bridge Scour and Bridge Condition Assessment Study. The study noted that erosion presented a significant risk to the bridge's substructure. Since funding was not immediately available at the time to implement the Study's preferred technical alternative of replacing the bridge, an interim erosion mitigation measure was proposed. In 2013 Dallas County engaged KH to design the interim erosion mitigation measure to protect the bridge's header banks and abutments against further erosion and to structurally reinforce the bridge bents. The City of Grand Prairie (City) and Dallas County (County) requested KH to perform the tasks necessary to develop the preliminary design to replace the existing bridge with a new bridge.
The ultimate typical street section for Rock Island Road will be four-lane divided. The proposed crossing at Bear Creek will be two, twin bridges matching the 4-lane divided typical section and is anticipated to be approximately 320 feet long. A hydraulic study will be performed on Bear Creek as a part of the preliminary design to determine the actual length and elevation of the bridge structures. The preliminary design for both (twin) bridges will be provided. The City and County will phase the implementation of the ultimate road and bridge improvements by just building one of the two proposed bridges. The length of embankment and roadway im...
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