Doug Kerr
Well-known member
The Mississippi River, together with its tributaries (notably the Missouri River, itself about 2300 miles long and the longest "single-named" river in North America) forms a continuous waterway over 3700 miles in length. It is thus only exceeded in length among the world's rivers by the Nile, the Amazon, and possibly the Yangtze.
The furthest tributary of the system arises in northern Montana, and the Mississippi itself discharges into the Gulf of Mexico through a complex and porous delta southeast of New Orleans, Louisiana.
Since the earliest days of the westward expansion of the US, the Mississippi has played an important role in travel and transport (as well of course as its role in hydrologic drainage).
An important format for the transport of a wide range of goods along the Mississippi is the river barge, of which there are many types. They are typically about 200 feet long and 35 feet wide. They are usually gathered into rigid flotillas called "tows', propelled from the rear by rigidly-attached diesel-powered tug boats (called, in particular, push tugs or pushboats).
The term "tow" goes back to earlier river practice in which one or more boats or barges were "towed" from the front by a towboat.
In the portion of the river south of St Louis, Missouri (in which there are no locks), tows of up to 40 barges - eight barges wide, five lengthwise - are practical (in some cases, even larger). Above St. Louis, the largest standard tow is 15 barges (three wide, five lengthwise). The entire tow, including the push tug, is about 1/4 mile in length.
Typically, the barges in the front have a sloped ("raked") bottom to the bow to reduce drag. The other barges may in fact have "box" ends (although "rake" barges may be used any place in the tow).
Here we see a very small tow (three barges):
Douglas A. Kerr: Three-barge tow on the lower Mississippi
The push tug here is unidentified.
Here we see a typical "small" push tug, the Dottie D:
Douglas A. Kerr: Push tug Dottie D
The Dottie D is 60 feet long and has a total propulsive power of 800 hp. Its rectangular hull is typical of many modern push tugs.
Now for something a bit bigger, the FR Bigelow:
Douglas A. Kerr: Push tug F R Bigelow
The F R Bigelow is 166 feet long and has a total propulsive power of 7200 hp.
Here we see something a bit different, the Robert J Bouchard
Douglas A. Kerr: Push tug Robert J Bouchard
The Robert J Bouchard is 127 feet long and has a total propulsive power of 6140 hp. Note the elevated pilot house, very useful to allow the captain to see over a long tow (especially when the barge has a deckhouse or such, as in this case) and in any case to give better visibility of the river ahead.
The hull of the Bouchard has a more traditional tugboat shape.
Note that here that the barge (an oil barge) has a "push notch" in the rear to receive the bow of the push tug. Only one barge is involved (both the tug and the barge are operated by the same company, and these two are permanently "paired" - they were in fact built as a "pair"). This barge has an overall length of 468 feet.
The tug and the barge are connected with a special coupling interface - the Intercon Coupler System. The complete arrangement is called an articulated tug-barge unit (ATB).
But that's a story all its own.
Best regards,
Doug
The furthest tributary of the system arises in northern Montana, and the Mississippi itself discharges into the Gulf of Mexico through a complex and porous delta southeast of New Orleans, Louisiana.
Since the earliest days of the westward expansion of the US, the Mississippi has played an important role in travel and transport (as well of course as its role in hydrologic drainage).
An important format for the transport of a wide range of goods along the Mississippi is the river barge, of which there are many types. They are typically about 200 feet long and 35 feet wide. They are usually gathered into rigid flotillas called "tows', propelled from the rear by rigidly-attached diesel-powered tug boats (called, in particular, push tugs or pushboats).
The term "tow" goes back to earlier river practice in which one or more boats or barges were "towed" from the front by a towboat.
In the portion of the river south of St Louis, Missouri (in which there are no locks), tows of up to 40 barges - eight barges wide, five lengthwise - are practical (in some cases, even larger). Above St. Louis, the largest standard tow is 15 barges (three wide, five lengthwise). The entire tow, including the push tug, is about 1/4 mile in length.
Typically, the barges in the front have a sloped ("raked") bottom to the bow to reduce drag. The other barges may in fact have "box" ends (although "rake" barges may be used any place in the tow).
Here we see a very small tow (three barges):

Douglas A. Kerr: Three-barge tow on the lower Mississippi
full metadata
The push tug here is unidentified.
Here we see a typical "small" push tug, the Dottie D:

Douglas A. Kerr: Push tug Dottie D
full metadata
The Dottie D is 60 feet long and has a total propulsive power of 800 hp. Its rectangular hull is typical of many modern push tugs.
Now for something a bit bigger, the FR Bigelow:

Douglas A. Kerr: Push tug F R Bigelow
full metadata
The F R Bigelow is 166 feet long and has a total propulsive power of 7200 hp.
Here we see something a bit different, the Robert J Bouchard

Douglas A. Kerr: Push tug Robert J Bouchard
full metadata
The Robert J Bouchard is 127 feet long and has a total propulsive power of 6140 hp. Note the elevated pilot house, very useful to allow the captain to see over a long tow (especially when the barge has a deckhouse or such, as in this case) and in any case to give better visibility of the river ahead.
The hull of the Bouchard has a more traditional tugboat shape.
Note that here that the barge (an oil barge) has a "push notch" in the rear to receive the bow of the push tug. Only one barge is involved (both the tug and the barge are operated by the same company, and these two are permanently "paired" - they were in fact built as a "pair"). This barge has an overall length of 468 feet.
The tug and the barge are connected with a special coupling interface - the Intercon Coupler System. The complete arrangement is called an articulated tug-barge unit (ATB).
But that's a story all its own.
Best regards,
Doug