Tay Bridge disaster warned of their unreliability, and declined to estimate conditions at Dundee from readings taken elsewhere. One modern interpretation of available information suggests winds were gusting to . Usage of the bridge was restricted to one train at a time by a signalling block system using a baton as a token. At 7:13 p.m. a train from the south (consisting of a 4-4-0 locomotive, its tender, five passenger carriages, and a luggage van (brake van) slowed to pick up the baton from the signal cabin at the south end of the bridge, then headed out onto the bridge, picking up speed.
River Tay froze over as far as the Tay Road Bridge, and ice floes remained for weeks despite a thaw. Several places along the Tay take their names from it, or are believed to have done so: The river is of high biodiversity value and is both a Site of Special Scientific Interest (SSSI) and a Special Area of Conservation. The SAC designation notes the river's importance for salmon ("Salmo salar"), otters ("Lutra lutra"), brook lampreys ("Lampetra planeri"), river lampreys ("Lampetra fluviatilis"), and sea lampreys ("Petromyzon marinus") . Tha Tay also maintains flagship population of Freshwater pearl mussel ("Margaritifea margaritifera"). Freshwater pearl