The Environment Agency state that it is around 16 miles (26 km) long, although not all of that length is called the Saredon Brook on maps.

After passing under the motorway and the A5 road it flows through two ponds and turns to the west, running to the north of the hamlet of Little Wyrley.

It then divides into two, with one channel running along the north side of the A5 road and the other passing under it into a large pond on the north-east edge of Churchbridge.

The government and Midland Expressway, who would operate the new road, were persuaded to provide a larger culvert, although the cost of it was to be paid by the Trust.

An appeal led by the actor David Suchet raised the finance, and the brook flows through a much larger culvert than it would otherwise have done.

It heads north-eastwards, passing through two large ponds, and significant portions of it are culverted beneath housing estates in Great Wyrley and Churchbridge.

After passing through Latherford Lane bridge, carrying another minor road, a short aqueduct crosses the brook.

Finally, to the west of the village of Coven, the brook discharges into the River Penk, which flows towards the north at this point.

The site of the mill and pond are now beneath industrial buildings in Lakeside Business Park on the north side of Walkmill Way.

The tail race joined the overflow from the mill pond, and emptied into the Saredon Brook after passing under the canal in a culvert.

The mill stream began to the east of the West Coast Main Line, and ran close to the brook on its southern side.

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), perfluorooctane sulphonate (PFOS) and mercury compounds, none of which had previously been included in the assessment.