These data are essential for partner agencies to estimate downstream flow, as well as analyze results to predict future event probabilities.
Realtime flood and historic data can be found at: USGS | National Water Dashboard
Streamflow data have been collected for around 100 years at three USGS streamgages on the Yellowstone River in southern Montana and can be used to provide probability of events occurring.
“At two streamgages, Yellowstone River at Corwin Springs and Yellowstone River at Livingston, the peak streamflow was higher than the 0.2% (or 1 in 500) flood during the recent flood event,” said Katherine Chase, USGS hydrologist. “While these floods are often referred to as greater than (or rarer than) a 1 in 500-year event, there is the same probability that they could occur in any given year.”
The provisional streamflow recorded on the Yellowstone River at Billings was between the 1% (or 1 in 100) and 0.2% (1 in 500) flood. All streamflow data are currently being reported as “provisional” until follow up analyses of the stream channel and data are completed.
The analyses used to calculate these probabilities uses data that the USGS and others have collected. Other techniques are being developed that use prehistoric data to determine what streamflows were before humans began recording data. These analyses can give more perspective to how rare these types of high flow events are.
More information from the USGS about flood frequencies can be found online.
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