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.