The river is fed by two streams rising in the
Dorset Downs; the source of the Preston River is Spring Bottom, approximately north of Sutton Poyntz. The other stream, known as the Osmington Brook, rises further east near
Osmington. This area of the Dorset Downs is part of the
Wessex Ridgeway; the springs emerge from the upper chalk of the escarpment. From its sources, the river flows into
Sutton Poyntz where the two streams converge. The northern branch of the river fed two corn mills—Sutton Upper Mill (also known as Sutton Poyntz Mill) and Sutton Mill. Upper Mill—along with Sutton Poyntz as a whole—was the inspiration for the mill and village of Overcombe in
Thomas Hardy's
The Trumpet-Major. The stream here forms the village duck pond, which was created as the
mill race for Sutton Mill. Downstream of the mill, the river is crossed by Roman Bridge. Although the name suggests the bridge is of
Roman origin, it is more likely to have been built after the
Norman conquest of England—a hypothesis supported by
Charles Warne and
Sir Talbot Baker. Continuing south, the river flows to the east of
Jordan Hill and bisects the site of Preston Roman Villa—although at the time of the construction of the
Romano-British building, the river's course was different. The river discharges into
Bowleaze Cove,
Crossings Osmington Brook Near its source, the Osmington Brook is bridged at Hall's Farm, and is crossed by an inland section of the
South West Coast Path. A number of footpaths cross the brook at Northdown Farm, after which it is crossed by Sutton Road in Sutton Poyntz shortly upstream of the confluence with the Preston River. Upstream of Sutton Mill, a footbridge crosses the mill race before it is fed under the mill buildings. Downstream of the mill, the river is crossed by Sutton Road and Puddledock Lane, before joining with the Osmington Brook. == History ==