As part of the Vision 2025 Tulsa County bond issue, the City of Bixby is making improvements to Haikey Creek to alleviate flooding issues. CGA Engineers was selected to provide construction documents. This meant leading a team of design professionals needed for full development. The project team included Aerial Data Service for aerial surveys, His Inc., for FEMA hydraulics and hydrology, and Eagle Environmental for environmental documents.
This project began with a partnership between the City of Bixby and the US Army Corps of Engineers to identify alternatives to eliminate flooding issues along and adjacent to Haikey Creek. Once the preferred alternative was identified, the design team began working on document preparation.
The preferred alternative included the construction of a diversion channel and a relief channel to drainage areas to the west of Haikey Creek. Secondly, improvements to Haikey Creek itself were made. The project was broken into two separate sets of construction plans. One for the diversion and floodplain relief channels and one set for the Haikey Creek channel.
The diversion and flood plain relief channels will follow the old creek alignment and one tributary forming a "y" shape. The basic design of the diversion channel is a 40 foot wide 15 foot deep channel improvement where the flood plain relief channel, the short leg of the "y", is a 30 feet wide. The channel construction required the design of several bridge boxes. On the diversion channel, all bridge boxes are triple cels 14.5 foot wide boxes of varying height according to the water surface profiles. On the flood plain relief channel, the boxes are 14.5 foot wide double cell boxes.
The improvements to Haikey Creek include both bench channels and diversion channels to increase capacity. Both the diversion and benches were designed to reduce environmental impacts. Areas between the diversions and the existing channel were listed as mitigation areas, again reducing environmental impacts.
The final plans for both phases of the project have been submitted and the 404 permit issued. This project is currently under construction.
The following is a list of major items included in the project.
Construction Cost - $12,000,000.00