Our work River work Access for migrating fish All river fish need to migrate at various points in their life cycle or at various times of year. They do this for a variety of reasons: to spawn; to make best use of feeding opportunities and to take refuge from extreme flows are just three examples. The rivers Wye and Usk are host to a number of species that need open, unhindered access upstream and downstream to thrive. Obstacles to fish migration can be man-made (weirs, pipe bridges, dams, bridge footings) or natural (waterfalls and timber blockages, for example). All can have significant negative impacts on a river’s fish populations. For more information on these effects and the situation in the Wye and Usk, please see here. “Restoring access remains by far the most cost effective river management action that can be undertaken” The Foundation's Fish Access Work Since 1996, the Foundation and its partners have embarked on an ambitious programme of restoring as much free access to migrating fish as possible. Since then we have completed over two hundred “easements” on both rivers. These range from unblocking timber jams and removing old weirs to the construction of complex fish passes. In total, we have restored full access to over 800km of the Wye and Usk. Restoring access remains the most important and by far the most cost effective river management action that can be undertaken on either river. Fish Access Maps Use the links below to see each year's map and how this work has opened up our catchments for migrating fish: 1972 1995 2009 2015 2016 2017 We are very grateful to the Environment Agency, Natural Resources Wales and the many other organisations who have helped us in this area of our work.