]> 2026-04-22T15:21:55+00:00 Case study:River Idle Hallcroft (Tiln) Weir Fish Pass 500 en Approved Rock ramp construction Environment Agency Great Britain Environment Agency Flood and Coastal Risk Management No No Yes false Hallcroft weir2.jpg Hallcroft weir3.jpg Hallcroft weir4.jpg Hallcroft May (1).jpg Hallcroft May (2).jpg Hallcroft May (3).jpg Hallcroft May (4).jpg Hallcroft 17 Jun 2015.jpg Hallcroft completed 1 July 2015.jpg Hallcroft completed 1 July 2015 2.jpg Before works The weir crest following debris removal Larger boulders forming the channel bank toe No 53.342937735035,-0.96095447894186 Joel Environment Agency Rawlinson Rock ramp construction,,, ,,, Following implementation of the fish pass improvements, we will monitor the impact through on-going survey work, which can be compared to past survey results. We have long term monitoring sites up and downstream of Hallcroft weir that have been monitored since the 1990’s - upstream at Eaton and downstream at Chain Bridge. Samples are usually taken in early May, so there will be a sample just before the project takes place and then we will get post project result the following May. These standardised monitoring results can also be compared to catch returns from the local angling clubs. 21771 2015-07-01Z 2457204.5 Hallcroft completed.jpg 2011-08-31Z 2455804.5 Complete To meet targets set by the Water Framework Directive (WFD), the Environment Agency completed a programme of habitat improvement works on the River Idle which is a major tributary to the River Trent. This project concerns Hallcroft Weir (AKA as Tiln Weir) in Retford, Nottinghamshire (SK69275 83396). Hallcroft Weir, located on the River Idle in Nottinghamshire is approximately 30-35km from the confluence at which the Idle meets the tidal Trent. Not including the sluice / pumping station control structures at the confluence, Hallcroft weir is the first physical barrier encountered by upstream migrating fish. Although originally passable to some species of fish, a combination of head loss and flow limited certain species ability to pass the weir. Hallcroft Weir is an Environment Agency owned asset. The weir is a broad crested type weir spanning the full channel width and running perpendicular to the flow. Downstream of the weir is a non-official rock ramp extending from approximately 1m downstream of the weir toe for 15m. The weir at Hallcroft prevented free movement of fish, particularly in an upstream direction. It was impassable to many species of fish under most flow conditions due to velocity and depth of flow. The project aim was to increase the migratory ability of all fish species in the River Idle and in particular eels. This will lead to a more sustainable population within the catchment as the work will allow the migrating eels and other fish species to reach more upstream habitat. The total project costs a 260,000GBP. River Idle Hallcroft (Tiln) Weir Fish Pass river idle hallcroft (tiln) weir fish pass No Idle and Torne Humber River Idle from Maun/Poulter Conf to Tiln river idle from maun/poulter conf to tiln 100 - 1000 km² 105 100 - 200 m River Idle from Maun/Poulter Conf to Tiln GB104028058091 Fisheries 366 100 - 500 k€ GB104028058091 River Idle from Maun/Poulter Conf to Tiln 2015-06-23Z 2457196.5 2015-04-06Z 2457118.5 2015-06-26T14:54:09Z 2457200.1209375 2017-06-02T09:53:54Z 2457906.9124306 River Idle Hallcroft (Tiln) Weir Fish Pass 500 1 plainlist 5 [[Category:Case study]] [[Project title::!River Idle Hallcroft (Tiln) Weir Fish Pass]] [[Subcatchment title::River Idle from Maun/Poulter Conf to Tiln]] River Idle Hallcroft (Tiln) Weir Fish Pass# QUERY3710d761997795883c3dbdbdeaa59da3