National Water Prediction Service

• Gauge reached a flood categoryTriggers when a river gauge's latest reading, its forecast, or either rises to or above the flood category you choose, once on the way up.

• List gaugesList the river gauges in a state or an area with their latest reading, forecast and flood category, optionally only those flooding or forecast to flood, the most flooded first.
• Get gaugeGet one river gauge: where it is, the stages at which flooding begins, its latest reading and forecast with their flood category, its highest crest and its hydrograph.
• Get flood impactsGet what floods at each river level at a gauge, in NOAA's words, and which levels the latest reading and the forecast reach.
• Get flood crestsGet the highest crests on record at a gauge, or its most recent ones, with the day, stage, flow and flood category.
• Get stage and flowGet a gauge's readings of the river's height and flow over the past hours, its forecast, or both.
• Get rating tableGet the flow the river carries at each stage at a gauge.
• Get upstream and downstream gaugesList the gauges upstream and downstream of a gauge, nearest first.
• Get reachGet a stretch of river in the National Water Model: its river, the reaches flowing into and out of it, and its streamflow forecasts.
• Get streamflowGet the National Water Model's hour by hour streamflow for a stretch of river: the recent past, the next 18 hours or the next 10 days.

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