A well-preserved example of a tidal water mill dating to sometime between 684 and 720 AD. It was found in association with a mill pond, water trough and wattle revetments/fish traps. The dual-chuted construction of the mill and the size of the wheel-pit suggests that horizontal wheels would have powered the mill. it does not seem to have been use for long before it was demolished possibly due to rising water level and silting. A number of the timbers are currently under conservation. Preliminary investigation has revealed a number of axe marks and on one of the larger chute timbers compass marks; evidence of the use of geometry. The dam comprised of two parallel revetments 3.2m apart. Construction consisted of planks on edge and piles. The space between the revetments was filled with sandy silt and the two pentroughs were housed into the surviving upper edges of both revetments. The pentroughs were housed in dam revetments to achieve a fall of 0.50m at an angle of less than 10 degrees. Construction consisted of splitting and hollowing a large trunk. Location accurate to 2m based on available information.