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The Lagan Weir, in Belfast, Northern Ireland, crosses the River Lagan between the Queen Elizabeth Bridge and the M3 cross-harbour bridge.[1] Prior to the building of the weir, the river would be subject to tidal fluctuations, and low tide would expose mudflats, which were unsightly and emitted a strong odour, particularly in the summer months. Opened in 1994, the weir was seen by the Laganside Corporation as a catalyst for its redevelopment projects and was judged to be the "centrepiece" of that effort.[1][2] The weir also incorporates a footbridge.