River Usk River Usk The River Usk (; ) rises on the northern slopes of the Black Mountain ("y Mynydd Du"), Wales, in the westernmost part of the Brecon Beacons National Park. Initially forming the boundary between Carmarthenshire and Powys, it flows north into Usk Reservoir, then east by Sennybridge to Brecon before turning southeast to flow by Talybont-on-Usk, Crickhowell and Abergavenny after which it takes a more southerly course. Beyond the eponymous town of Usk it passes the Roman legionary fortress of Caerleon to flow through the heart of the city of Newport and into the Severn estuary at Uskmouth beyond
Newport, Washington two towns, and it is strictly a political division, separated by the straight-line state boundary. About one-half mile north of Newport, the Pend Oreille River enters Washington State and flows north to Canada. The watershed of the Pend Oreille in the Newport-Oldtown area west of the river is extremely limited. This is due to a small depression of no more than , which begins about one-half mile from the river. Unable to flow uphill, the waters (from natural springs, rainfall runoff, etc.) eventually form the Little Spokane River, and flow southwest towards Spokane. Diamond Lake, WA (elevation 2,345 ft.) is