What does the dashed line at mile 390.5 represent?

At 0509, on 26 December, you pass under the Helena Highway Bridge (mile 661.7 AH...

At 0715, on 24 May, you are abreast the St. Catherine Bar Lt. (mile 348.6 AHP)....

At 1227, on 19 October, you pass under the Greenville Highway Bridge (mile 531.3...

At 2126, you pass Morganza Bend Light (mile 278.4 AHP). At 0122, 4 January, you...

In addition to the Army Corps of Engineers maps, data on bridge clearances may b...

As you approach Buckridge Light (mile 412.5 AHP), which type of daymark would yo...

As you approach mile 659 (AHP), you notice on the map a dashed line crossing the...

As you approach mile 425 AHP, you see a shaded area along the left descending ba...

The area between Island 67 Upper Light (mile 623.1 AHP) and Sunflower Cut-off Fo...

What are the color and shape of Togo Island daymark at mile 414.6 AHP?