Lake Merwin siteid=519 · WA

Water level & flow 2017-09-30 .. 2026-09-16 · SWOT depth track + USGS NWIS gauges · one linked timeline

filter: normal range & outlook fill (Mar–Jun) · drain (Jul–Oct) zoom or pan either chart — the other follows elevation trend: robust smoothing + outlier removal · raw value on hover

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Inflow / outflow USGS NWIS daily discharge · same timeline as above

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