It was built around 1801 just west of Carew Castle, and replaced a much older mill in the same location.

Carew Tidal Mill stands on the south end of a 150 metres (490 ft) long causeway across the Carew River, a tidal inlet east of Milford Haven.

[2] A much older mill, which may have been built in the same period as the castle, used to stand at this location.

[5] The clay core dam faced with stone encloses an 11 hectares (27 acres) mill pond.

[1] The present Carew Tidal Mill has two water wheels, one with the date of 1801, so was probably built around that time.

[4] There are two 4.8 metres (16 ft) undershot water wheels with wooden bucket paddles.

On the ground floor there is machinery for lifting the sluice gates and for the running stones.

The stone floor also houses the machine for cleaning the grain and the flour dresser.

[1] The miller's house adjoined the mill, which was essential since working hours were any time in the day or night when the tide began to ebb.

At the same time the introduction of the railway to Pembrokeshire created demand for dairy farming.

[1] The restorations and renovations cost around £100,000 and included major work to underpin and strengthen the structure, new windows and drainpipes, improvements to the interior, addition of a small reception area and an audiovisual room.