The mast could be taken down so that the trow could go under bridges, such as the bridge at Worcester and the many bridges up and downstream. The mast was stepped in a three sided frame open at the rear but closed with an iron pin or rope lashing. From the top of the mast a forestay ran down to the bow winch. To lower the mast the pin was removed and the winch slackened off to let the mast fall towards the stern. The reverse operation pulled the mast up. One such Trow, called "Joan", was owned by a timber merchant called Oliver Luff. He used her to bring timber from Tintern, Monmouthshire into 'The Back' now called 'Welsh Back' in Bristol's Floating Harbour, where he owned two timber yards. A pub, the Llandoger Trow is situated in Bristol. Trows were seaworthy, as with an added keel they could take 90 tons of salt from Droitwich to France across the English Channel. The flat-bottomed trows sailed on the sea by hauling a 20-foot (6.1 m) log of wood under the hull strapped with chains to stop the hull sliding sideways.
There are two traditional types of Severn Trow. Prior to the 1840s the River Severn was tidal up to Worcester. The trows that were used on the tidal portion of the River were called Downstream Trows whilst those that sailed north of Worcester were called Upstream Trows and were smaller. An example of a Downstream Trow, the Spry, is at the Blists Hill site of the Ironbridge Gorge Museums. During the summer the flow of water was often very low and so the trows were pulled over the resultant shallows. A rope was attached to the mast and the men who pulled the boats were called bow hauliers. The men would enter into a contract with the captain of the trow in the many pubs along the Severn riverbanks, and there was a right of way along the bankside.
A smaller version of the above (18 feet (5.5 m) max) is peculiar to the Fleet lagoon in Dorset. It is used primarily for the transport of mackerel caught by seine net fishing crews off Chesil Beach. Once caught they are boxed and transported across to the mainland by these flat-bottomed boats. Unlike the River Severn version the Fleet variant is only ever towed, rowed or punted and has no mast or sail.
Trow may be pronounced as trō (rhyming with "crow") or as trou (rhyming with "cow"). The former pronunciation was the usual one throughout Worcestershire, Shropshire and Dorset. While the latter exists regionally, dictionaries often give only the former pronunciation.
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