In order to create a navigable channel from Lough Allen it will be necessary for Waterways Ireland to conduct dredging operations at a number of locations. In the lower reaches of the river, dredging will mainly involve removing deposited and compacted silt from the point where the river enters Lough Allen and from a number of isolated stretches along the river. In the stretch immediately downstream of Annagh Upper, bedrock is present and will have to be removed to provide navigable depth for boat traffic. A weir is to be constructed from this bedrock across the river to the same height as the existing rock shelf, in order to retain existing water levels upstream of the new moorings.

The works also include creating a ‘lay-by’ to accommodate a 16 berth public marina consisting of floating walkways and finger jetties. An access ramp to the moorings specially adapted for disabled users of the navigation will be provided. In addition to the provision of water and sensitive lighting on the moorings, the area is to be landscaped and provided with a car park, public footpaths and seating.

The floating jetty configuration, as opposed to a fixed arrangement, will maintain a consistent freeboard between the water level and the deck of the jetty, allowing easy access for boat users using the navigation, regardless of water level. This arrangement for the moorings not only maintains the full width of the river for navigation but also provides shelter and room to manoeuvre for boats using the facility.

By David Foxwell