Title
CONTRACT K-1718-55: A PROJECT AGREEMENT BY AND BETWEEN THE CITY OF NORMAN, OKLAHOMA, AND THE OKLAHOMA DEPARTMENT OF TRANSPORTATION (ODOT) IN THE AMOUNT OF $1,120,000 FOR THE CITY'S SHARE FOR PROJECT STP-114(C)(255)AG, STATE JOB. 26836(04), FOR THE WEST MAIN STREET BRIDGE AT BROOKHAVEN CREEK AND ADOPTION OF RESOLUTION R-1718-30.
Body
BACKGROUND: The existing West Main Street Bridge over Brookhaven Creek was constructed in 1972. This bridge is identified in the Storm Water Master Plan (SWMP) as being "hydraulically deficient" because it is unable to convey a ten-year (10%) storm. This condition likely caused the bridge to sustain serious damage in the flash flooding event of August 19, 2007. City crews made temporary emergency repairs at that time to keep the bridge in service. On January 27, 2009, the Norman City Council approved programming Resolution R-0809-96, requesting federal funds to replace the bridge and roadway approaches on West Main Street over Brookhaven Creek, located 1/2 mile west of 36th Avenue West.
The existing West Main Street Bridge consists of two 55' long by 9.5' by 6.4' arch pipes that were constructed in 1972. The existing arch pipe bridge structure will be removed and replaced with a triple cell 16 foot by 8 foot Reinforced Concrete Box (RCB) that will be capable of handling the 100-year 1% storm, meeting the City of Norman Design Standards. In addition, approximately 2,900 feet of channel improvements will occur from just upstream of Main Street south to Willow Grove Drive. These improvements will consist of an Anchored Reinforced Vegetation System (ARVS) for the majority of the channel and a Mechanically Stabilized Earth (MSE) retaining wall installed at a 2:1 or 3:1 slope. The channel improvements will allow a larger discharge below the bridge, without raising the Base Flood Elevation (BFE) anywhere along the creek, and decrease stream bank erosion. Included in the improvements is the planting of 2,300 1-inch diameter...
Click here for full text