on the left bank of the arkansas river, the levee extends from river mile 531.0 near sand springs, oklahoma, downstream to river mile 521.4 at tulsa. on the right bank, the levee extends from near river mile 526.7 downstream to river mile 521.3 and is adjacent to the major portion of the business and residential districts in west tulsa. approximately 12.4 miles of levees were constructed prior to february 1938 in accordance with plans contained in hd 308, 74th congress, 1st session. improvements and additions to the levees were initiated in the fall of 1943 and were completed in the spring of 1945.