Shannon Bridge is by far the newest River Shannon crossing in Limerick city centre. It was built in the late 1980s, and connects to a relief road that passes through a bird sanctuary and runs around the north of the city. The bridge is still at times referred to as "The New Bridge", For some time after its construction, the bridge was also termed "The Whistling Bridge" — the fencing on the bridge resonated with the winds coming up the Shannon Estuary, producing a shrill whistling sound. In extreme winds, the sound was quite deafening. Simple grills were added, and the effect was ceased.
Source: Wikipedia