It is known as St. Sunday's Beck, and flows southwards, passing through an area of woodland called Hutton Park Plantation before turning to the east.

[3] A minor road crosses the beck just before it reaches Stainton Aqueduct, constructed by the engineer John Fletcher in 1818 for the opening of the northern section of the Lancaster Canal.

[8] The B6385 road crosses at Rowell Bridge, and on its upstream side, there was a tramway bridge, where the Gatebeck Tramway crossed on its way from Gatebeck gunpowder works on the Peasey Beck to Milnthorpe railway station.

Within a short distance, it enters Fisher Tarn Reservoir, which was built under powers contained in the Kendal Corporation Act 1894.

[9] The dam is around 30 feet (9.1 m) high, and there is a central overflow section, consisting of three semi-circular sluice openings with mock medieval turrets on either side.

A small machinery house is located at the foot of the overflow channel, which has a date stone showing October 1896.

[11] Beehive Beck continues from the foot of the dam, and passes under the old Kendal to Sedbergh road.

[11] A minor road runs along the east bank of the stream, past Holme Park.

The present mill house was first occupied by the Tarn family, and carries a stone showing "J.J.T.

The mill machinery was destroyed by a fire in 1927, and although the wheel and turbine were not damaged, the cost of rebuilding was beyond the means of the owner, Mr Parkin.

[13] At Halfpenny, a hamlet that is part of the parish of Stainton, a weir channelled water into a race on the left bank, which fed Yarn Mill.

The tail race passed under the road, to the west of Mill Bridge, and joined the main channel further downstream.

[13] In 1849, the mill was operated by Greenwoods, who were carding wool, which was then used to produce stockings and blankets.

There are several components that are used to determine this, including biological status, which looks at the quantity and varieties of invertebrates, angiosperms and fish.

Like many waterways in the UK, the chemical status changed from good to fail in 2019, due to the presence of polybrominated diphenyl ethers (PBDE) and mercury compounds, neither of which had previously been included in the assessment.