Freighters Waiting Their Turn to Enter the Locks - Sault Ste. Marie, Michigan - 1940s Linen Postcard

Front: Freighters Waiting Their Turn to Enter the Locks, Sault Ste. Marie, Mich. - 1940s Linen Postcard
Back: "Approximately 25,000 ships pass through the Soo Locks during the eight months navigation period. The Weitzel Lock is 515 feet long; the Poe Lock 800 feet long; the Davis and Sabin Locks, each 1550 ft. long, or 250 feet longer than the famous Gatun Locks at Panama. Either Davis or Sabin lock can lock through two modern 600 ft. steamers at one time." Followed by a handwritten note.
Condition: Fairly good condition. There is writing on the back. The card also has some creases on the corners.
Time frame: 1940s.
Mailed. Green, 1 cent stamp
Hand color.
Publisher: Young's Studio