Sclulpture commemorating the rescue by Tom Lee, a black man, of 23 white survivors after the M.E. Norman sank in rough waters on the river in 1925. Though Lee could not swim, he continued to pull survivors out of the river from his skiff.
The number and letter are updated periodically to allow boats on the river to know the river's depth and if the level of the water is rising or falling. The depth when this photo was taken was 14 feet and the river level was falling. This information is important for the many tugs that ply the Mississippi River.