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The material below taken from this URL describes how to reduce the GT
from 2200 to less than 100.
http://www.cawreckdivers.org/Wrecks/sacramento.htm
Upon its arrival, the listing Sacramento was pumped dry and dry docked
so that it could begin its modification for use a fishing barge. Railing
was built on both of her open double ends and her massive paddle wheels
were cut down. During the salvage of her engines back in the scrap yard,
heavy firebrick was carelessly thrown over to one side, causing the
Sacramento to take on a noticeable list. So, to put the barge back on an
even keel, 400 tons of concrete ballast was used to balance the weight.
Since the sinking of the Olympic II in 1940, laws regarding fishing
barges became much more strict. Regulations requiring bulkheading
(creating watertight compartments) were made and sometime thereafter, a
restriction was imposed that limited the size of fishing barges to 100
tons. The Sacramento at 2,200 tons, well exceeded this limit. To
calculate a vessel's tonnage, simple measurements are taken which are
plugged into a formula thus saving the time consuming task of measuring
every room and compartment on the vessel. However, some compartments are
not counted in the measurement. An old "trick" to reduce a vessel's
registered tonnage (to reduce payments in harbors, canals, etc., where
fees are based on tonnage) was to put bulkheads in key places, and to
add "tonnage doors." By using these methods, Hale was able to reduce the
Sacramento's registered tonnage down to 87 gross tons. Likewise, another
barge once owned by Hale and the Redondo Sport Fishing company, the
Retriever was reduced down to 99 tons.
Capt. Mike Maurice
Wilsonville, Near Portland Oregon
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