_Above level_ From the Gulf of Mexico _Miles. of the sea_. To New Orleans, La., 110 10.5 " Donaldsonville, La., 188 .... " Plaquemine, La., 210 .... " Baton Rouge, La., 240 .... " Port Hudson, La., 263 .... " Bayou Sara, La., 275 .... " Mouth of the Red River, La., 315 76 " Fort Adams, Miss., 327 .... " Natchez, Miss., 387 86 " Grand Gulf, Miss., 450 .... " Warrenton, Miss., 500 .... " Vicksburg, Miss., 512 .... " Mouth of the Yazoo River, Miss., 522 .... " Milliken's Bend, La., 538 .... " Lake Providence, La., 588 .... " Greenville, Miss., 657 .... " Napoleon, Ark., and mouth of the Arkansas River, 730 .... " Mouth of White River, Ark., 756 .... " Helena, Ark., 838 .... " Mouth of St. Francis River, Ark., 848 .... " Memphis, Tenn., 928 .... " New Madrid, Mo., 1,113 .... " Columbus, Ky., 1,167 .... " Cairo, Ill., and mouth of Ohio River, 1,187 324 " Cape Girardeau, Mo., 1,237 .... " St. Louis, Mo., 1,388 382 " Mouth of the Illinois River, 1,422 .... " Upper Iowa River, Io., 1,984 .... " Mouth of St. Peter's River, Minn., 2,198 744 " Falls of St. Anthony, Minn., 2,206 856 " Lake Cass, Minn., 2,761 1,402 " Itasca Lake, Minn., 2,890 1,575 " Springs on the summit of Hauteurs de Terre, 2,896 1,680