Missouri River in Western Montana

Latitude N47 47.154" W109 15.64".  Lewis and Clark passed here, westbound on May 27, 1805 on mile 2393 of their traverse, corrected to mile approximately mile 1973 on plate 214/215 of the Plamondon Charts.  Lewis's eastbound group passed here on July 30, 1806.  This image has been slightly adjusted for color and reduced in size from the original.  The original image, adjusted for color and saved as a jpeg is 4.6MB.  With an unsharp filter applied, that image is  5.9MB.