The second of Limerick's River Shannon crossings is now called Sarsfield Bridge, to commemorate Patrick Sarsfield, the Earl of Lucan, who is renowned in Limerick for his role in the Williamite War and the 1691 siege and Treaty of Limerick in particular. The bridge was opened as Wellesley Bridge on 5 August 1835, following 11 years of construction. It was designed by the Scottish engineer Alexander Nimmo and based on the Pont de Neuilly in Paris. It was a particularly important development for the city as it allowed expansion to the northern shore of the river. The bridge itself consists of five large and elegant elliptical arches with an open balustrade, running from a man-made island, originally called Wellesley Pier but now known as Shannon Island, to the northern shore, and a simple flat, swivel deck with iron lattice railings crossing a canal and road from the island to what was known as Brunswick Street, now Sarsfield Street. The swivel end is no longer functional, although some of its heavy machinery is still intact underneath the roadway. A lock system has replaced the swivel section to allow for the passage of smaller boats. Apart from this, the bridge has remained largely unchanged since it opened and still has its original lamp standards.