The much-repaired water wheel, dating from the seventeenth century, and the corn milling machinery are still intact.

[2] Beyond Tetford the river is joined by Double Dike, and flows south through woodland, passing to the west of Somersby and Bag Enderby.

Here it is joined by a second stream, which rises on the eastern slope of Castcliffe Hill in Fulletby, close to the 280-foot (85 m) contour.

[1] The railway line between Boston and Skegness crosses to the north bank, and then follows the course of the river to below Wainfleet All Saints.

Thorpe Culvert pumping station, owned by the IDB, is located just before the second bridge, and after it, the Wainfleet Relief Channel turns off, passing under the railway almost immediately.

[1] Crow's Bridge has an elliptical arch constructed of red bricks, and was designed by the engineer John Rennie in 1812.

[5] Croft Lane bridge is next, after which the A52 and the Boston to Skegness railway cross, and the relief channel rejoins Wainfleet Haven.

[7] Below the outfall, Gibraltar Point National Nature Reserve is located to the east among the dunes and saltings.

[11] As the layers of rock continue to dip to the east, they are covered by boulder clay, gravel and alluvium.

[12] Flow on the upper river is measured by a gauging station at Partney Mill, consisting of a Crump weir with a 16-foot (5 m) crest.

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 most rivers 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.

Because the old channel ran through the manor of Croft, and was used to supply drinking water for cattle, an agreement for its management was reached in 1240.

At the request of Lindsey Marsh IDB, a small team of volunteers began to restore the station and the engines in 1994, and the site is opened for visitors three times a year.

The town was much closer to the sea at that time, but the gradual silting of the channel and the enclosure of land on both sides of it saw the demise of the port, with its function taken over by Boston.