Tulsa and West Tulsa Levees A and B are on the Arkansas River in Tulsa County, Oklahoma. The levees are earth embankments averaging 15 feet tall and each being about five miles long and they are connected by concrete floodwalls built over a box culvert floodway structure that allows a major road and a railway to cross the mouth of Bigheart Creek. The levees were constructed by the U.S. Army Corps of Engineers and after completion in 1944 ownership was transferred to Tulsa County Drainage District No. 12 for continued operations, maintenance, repair, rehabilitation, and replacement actions. There are approximately 6,275 people who live and work behind this levee. Without the levee, it is estimated that some 3,072 residential and commercial structures valued up to $1.13 billion dollars could be flooded. Additional environmental consequences could result if Superfund site behind levee is flooded. Loss of life is possible if the levee were to fail or overtop during a flood. The levees have a history of poor performance. During the 1984 record rainfall event in Tulsa, Bigheart and Harlow Creeks overtopped levees causing extensive erosion and foundation failure of floodwalls. Dozens of residential structures were flooded and many were demolished. The 05OCT1986 flood of record with a 307,000 CFS flow on the Arkansas River loaded levees to about 80% of their total height and breaches were barely contained by flood fighting efforts. Significant repairs were made after both events but concerns remain with aging culverts, plugged toe drains and relief wells, and antiquated pumping stations that are all now more than 70 years old.