This report describes the results of an archaeological excavation carried out in advance of construction of the N25 Waterford City Bypass. Waterford City Council procured two archaeological services contracts in February 2002. The contracts covered the assessment of 274 hectares of land required for construction of the bypass and made provision for the excavation and preservation by record of any previously undocumented archaeological sites identified. Contract 1 was awarded to Archaeological Consultancy Services Ltd; Contract 2 was awarded to Archaeological Developments Services Ltd. Geophysical survey and test excavations commenced on the scheme in March 2002 and assessment works continued on-site until July 2002. Following receipt of statutory approval for the scheme in October 2002 archaeological excavation services recommenced in 2003; these works comprised the excavation of remains identified during the previous year’s test excavations. Additional test excavations were also carried out in lands that had been inaccessible the previous year. In early 2004 Waterford City Council awarded archaeological services Contract 3 to Headland Archaeology Ltd. This contract covered the completion of test excavations in a number of areas and the excavation of sites identified in 2003. Contract 3 commenced in February 2004 and site works continued until January 2005. By that time all the available lands which were to be acquired for the bypass, as originally designed, had been archaeologically assessed and all identified archaeological remains impacted by the bypass had been excavated and preserved by record. In total 68 excavation licences were issued for the excavation of 71 sites under Contracts, 1, 2 and 3. In 2003 test excavations in Woodstown townland uncovered extensive archaeological remains associated with a previously undocumented Viking-Age settlement (designated Woodstown 6) which extended along approximately 500 m of the proposed bypass and also extended outside the boundary of the lands acquired for road construction. In February 2005 the Minister for Environment, Heritage & Local Government declared the Woodstown site a National Monument and, using powers acquired under the National Monuments (Amendment) Act (2004), directed Waterford City Council to identify an alternative route for the section of the bypass so the monument could be preserved in situ. Additional test excavations and geophysical surveys were undertaken on the 25 hectares of land required for the Woodstown Alternative Alignment in 2006 as an extension to Contract 1. Following receipt of statutory approval 12 archaeological sites identified on the alternative route were excavated by Archaeological Consultancy Services Ltd between April and July 2007. These excavations were carried out under Ministerial Direction ref. no. A037, though part of one site (Bawnfune 2) identified during topsoil stripping of the wayleave for the diversion of a gas pipeline was excavated in 2006. Archaeological monitoring of construction works in previously inaccessible areas (approximately 4% of the total scheme) was carried out by Sheila Lane & Associates on behalf of Celtic Roads Group, the consortium that had been awarded the Public Private Partnership (PPP). Construction works in 11 areas were archaeologically monitored between June 2006 and September 2009, under Ministerial Direction ref. no. A037. The only significant archaeological site identified was a fulacht fia in Newrath (designated Newrath M) which was excavated and preserved by record. Rathpatrick 10 consisted of multiple phase of activity uncovered in two areas (Areas A, C and D) in three adjacent pasture fields on the east side of a stream. The earliest activity was uncovered in Area A it consisted of a hearth associated with a concentration of stake-holes and small linear slots. A sample of ash charcoal from the pit's basal fill returned a radiocarbon date of 2132–1949 cal BC. The second phase of activity on the site is represented by a fulacht fia which had evidence of three phases of use. The first phases consisted of two sub-circular troughs, sealed beneath a compact deposit contained burnt stone; a sample of alder charcoal from the basal fill of one pit returned a radiocarbon date of 1500–1410 cal BC. This deposit was cut by a third trough which was sealed beneath a crescentic deposit of burnt mound material. A fourth trough was found between the two terminals of the crescent. The third phase of activity is represented by features uncovered in Areas A and D. A cereal-drying kiln was found in Area D it comprised a rectangular bowl, flue and rakeout pit, surrounded by a semi-circular slot-trench. Charred barley and wheat grains were recovered from the fill of the rakeout pit, a sample of wheat grain from the basal fill of the rakeout pit returned a radiocarbon date of cal AD 1170–1258. The slot-trench contained sherds of locally manufactured cooking pots of 13th- to 14th-century date. An arrangement of six oak planks set side by side was found in the former bed of the stream. One of the planks returned a dendrochronological end date of AD 1118, suggesting that the felling took place later than the mid 12th century. The function of this feature is unclear, it may have been a trackway or could have been the last vestiges of a structure built in the bed of the stream such as a mill. A late 12th- to 13th-century AD copper-alloy stickpin was found in the stream-bed at the same stratigraphical level as the planks. A scatter of post-holes was identified along the bank of the stream. The ground plans of four possible rectangular post-built structures were discerned amongst the post-holes. The northernmost and most convincing structure was located in a square area delimited by two converging stream channels, just east of the oak plank structure. It comprised an arrangement of 19 stake-holes and post-holes which defined an area 9.5 m by 6.5 m, oriented north–south. A pit, located adjacent to the south-west corner of the structure contained sherds of 13th- to 14th-century locally manufactured pottery. A series of regular linear features identified adjacent to the structures in Area A were interpreted as wheel ruts.