We present a 225-year (1799–2024) homogenized daily water level record for the Vistula River in Warsaw, comprising 82 453 observations. Adjustments were made for gauge relocations, zero shifts, unit differences, and Julian–Gregorian discrepancies. Missing data were reconstructed using the Long Short-Term Memory (LSTM) method, applied to stage–stage relationships with downstream stations. The dataset provides a robust basis for long-term hydrological, climatic, and socio-environmental research.