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See this Public Information Statement (PDF) from the National Weather Service in Burlington.
The affected USGS gauges include some we often use.
I assume that the flow models for these gauges are also being adjusted, so that calculated flows will remain unchanged for a given actual water level. The stated water level (the "stage" in feet) is relative to a reference level, so it has an element of arbitrariness. If the reference level is changed then the stated level will change, i.e., the stated level for a given flow at the gauge location will change.