Reports of roads that are clear in heavy rain are just as useful as flooded ones. They tell us the level a road can cope with.
The measure is the highest gauge level in the 12 hours before a given moment, because roads stay under water for several hours after the stream peaks. For each road the model estimates the level at which it becomes impassable, allowing ±0.15 m of scatter from rain falling in different places, debris in culverts and timing. Every "flooded" report pulls that level down; every "passable" or "clear" report pushes it up. Reports from the public count for half as much as the site owner's own checked observations. Roads with no "clear" or "passable" reports have no lower bound, so their low-level chances are cautious guesses. The probability words follow the UK government's probability yardstick.
The bold figure is the highest level in the 12 hours before the report, at the road's own gauge. The other gauge columns show the same measure for comparison. Figures marked * are estimates; hover over them for details.
The highest daily peaks on record from the EA hydrology archive. If you have flood photos from any of these days, please report them.