Mid Calder weir

Mid Calder weir, in it’s current form, was constructed in the early 19th Century although there is evidence of a similar structure on this site dating as far back as the 16th Century. The main function of this weir is difficult to see today as there has been development of the site over the last 30 years. A mill once stood on the site of the water treatment works and would have processed the grain from the surrounding farms. Power for the mill would have come from the lade, now blocked, which ran along the river bank almost exactly where the path runs today.

Although this weir has a fish pass already, it has proved itself inadequate since it’s construction almost 40 years ago. The plan for this weir is to construct a rock ramp, a more natural solution to improving barriers to fish migration. Large boulders will be placed in front of the weir to create a series of pools which will allow fish to rest as they make their way upstream to the breeding habitat in the upper reaches of the river. This option will protect the island in front of the weir, which has become a well established woodland habitat, whilst maintaining clear passage for fish migrating upstream.

Where can I see it?

Coordinates: River Almond

55.896708, -3.476117

Located on the main river between Mid and East Calder. The best way to see the weir is on foot or bicycle on the footpath through Almondell & Calderwood country park, parking is available at Mid Calder (although often fills up) and from there is just a short walk or cycle (route 75) of about ¼ a kilometre.


FRT as part of the RiverLife project is working with West Lothian, in consultation with other stakeholders to plan the works. This will be happening in 2019 with planned works following on from this process.