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Galway County Council proposes to realign a sector of the N59 national secondary road where it skirts the northern shore of Derrylea lake, roughly 5 km east of Clifden, in Connemara. The N59 national secondary road is the coastal route between Galway and Sligo, via Clifden, Westport and Ballina. The present scheme proposes to realign a sector of that route about 5 km east of Clifden, where it skirts the north shore of Derrylea lake and the smaller, neighbouring Loughanemlagh. The total length of the new sector will be 3.8 km and it lies between NGR 069453 249777 and NGR 073042 249272. The aim of the work is to improve road safety and shorten journey times by achieving higher design standards in the new or realigned section. Some of the improvements will follow the line of the existing road but about half of the work will involve realignment. An assessment, by means of desk-based research and a walkover survey, of the architectural and archaeological heritage of the area to be impacted by the proposed road works was undertaken by Jerry O'Sullivan, archaeologist with the National Road Design Office (NRDO), Galway (O'Sullivan 2005). Information from that report has been freely used in this report. The assessment identified a 5m diameter, sub-circular structure in the townland of Derrylea (Moyrus parish, Ballynahinch barony). This structure is the subject of the present report. The test trenching was commissioned by Feidhlim McGillycuddy, Roads and Transportation Unit, Galway County Council, on advice from Jerry O'Sullivan NRDO Galway.