<P> Just past Yarm, the River Leven joins the Tees, before passing the settlements of Eaglescliffe, Ingleby Barwick and Thornaby - on - Tees . Now nearing the sea, the Tees becomes an important commercial waterway, with the ports of Stockton - on - Tees and Middlesbrough on its banks . It passes through the Tees Barrage between these ports, turning tidal downstream from the barrage . </P> <P> Teesport is built on reclaimed land on the south side of the Tees estuary below Middlesbrough . </P> <Table> <Tr> <Th> Monitoring station </Th> <Th> Station elevation </Th> <Th> Low water level </Th> <Th> High water level </Th> <Th> Record high level </Th> </Tr> <Tr> <Td> Middleton - on - Tees </Td> <Td> 216 m (709 ft) </Td> <Td> 0.37 m (1.2 ft) </Td> <Td> 1.5 m (4.9 ft) </Td> <Td> 3.19 m (10.5 ft) </Td> </Tr> <Tr> <Td> Barnard Castle (Startforth) </Td> <Td> 141 m (463 ft) </Td> <Td> 0.46 m (1.5 ft) </Td> <Td> 1.4 m (4.6 ft) </Td> <Td> 2.68 m (8.8 ft) </Td> </Tr> <Tr> <Td> Broken Scar (Darlington) </Td> <Td> 41 m (135 ft) </Td> <Td> 0.54 m (1.8 ft) </Td> <Td> 1.7 m (5.6 ft) </Td> <Td> 3.28 m (10.8 ft) </Td> </Tr> <Tr> <Td> Low Moor (Low Dinsdale) </Td> <Td> 18 m (59 ft) </Td> <Td> 0.31 m (1.0 ft) </Td> <Td> 4 m (13 ft) </Td> <Td> 6.32 m (20.7 ft) </Td> </Tr> <Tr> <Td> Yarm </Td> <Td> 7 m (23 ft) </Td> <Td> 0.45 m (1.5 ft) </Td> <Td> 2.05 m (6.7 ft) </Td> <Td> 4.08 m (13.4 ft) </Td> </Tr> </Table> <Tr> <Th> Monitoring station </Th> <Th> Station elevation </Th> <Th> Low water level </Th> <Th> High water level </Th> <Th> Record high level </Th> </Tr>

What height above sea level is the river at yarm
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