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Rivers keep time

Six American rivers, each drawn as a single year: January on the left, December on the right. The pale threads are the ten individual years 2015–2024; the solid shape is the typical one. Every river has a season, and no two rivers agree on when it is — except the one where a dam decides. Tap or hover any river.

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Data & source

Source: USGS National Water Information System, daily mean discharge (parameter 00060) at six gauges, 2015–2024, fetched — · public domain. Each river is scaled to its own typical peak, because they differ by three orders of magnitude — the shapes compare, the heights do not. Provisional recent values may be revised by USGS. Six gauges chosen to contrast regimes, not to represent the country.