The first tow of the season went up the Missouri River and passed by the Hermann riverfront last Monday. Capt. Steve Engemann of Hermann Sand & Gravel piloted the motor vessel, Mary Lynn, that was pushing four fertilizer barges to Brunswick, Mo. Barge traffic on the Missouri River usually opens the middle of March.The first tow of the season went up the Missouri River and passed by the Hermann riverfront last Monday. Capt. Steve Engemann of Hermann Sand & Gravel piloted the motor vessel, Mary Lynn, that was pushing four fertilizer barges to Brunswick, Mo. Barge traffic on the Missouri River usually opens the middle of March.