The AARC project (Partner 1 [Westcountry Rivers Trust]) in collaboration with a consortium of riparian owners and the Environment Agency, undertook the replacement of Head Weir on the River Mole, one of the main tributaries of Devon’s River Taw. The project was designed to replace the old weir and fish pass with a state-of-the-art pool and riffle system that will be the first of its kind in Britain.
The old Head Weir was a 2m high smooth-faced concrete chute that, despite having a fish pass on it, was regarded by many as an almost complete barrier to fish migration up the River Mole to the large spawning and nursery areas that are known to exist in its headwaters.
Weir today, gone tomorrow
The video in this post shows the moment the digger opened the channel and the River Mole began to flow through the Natural Fish pass. The last part of the video is speeded up a little to show the filling up of the fish pass, so the diggers do appear to be moving a little fast!