| Wayoh Reservoir | |
| Location: | Edgworth, Lancashire, England |
| Coords: | 53.6469°N -2.4064°W |
| Pushpin Map: | United Kingdom Blackburn with Darwen |
| Pushpin Map Caption: | Shown within Blackburn with Darwen |
Wayoh Reservoir is a water reservoir in the town of Edgworth, Lancashire, England. It was completed on 28 April 1876 to supply water to Bolton.[1] [2] Wayoh, together with the Turton and Entwistle Reservoir, make up 50% of Bolton's drinking water.[3]
In 1962 in response to an increasing demand for drinking water in Bolton, a treatment plant was built and the reservoir enlarged to its present capacity of . Today the treatment plant can supply almost of drinking water per day.
The reservoir is crossed by the earlier built Armsgrove Viaduct; which was built between 1847 and 1848 by the Blackburn, Darwen and Bolton Railway to bridge Bradshaw Brook.[4]