Gauge Speyer is on the Rhine at kilometre 400, on the km 384–410.5 stretch. The GlW is 237 cm and the fairway depth maintained below it (TuGlW) is 210 cm; after deducting 30 cm of safety margin the official rule of thumb comes out at Speyer -57. In practice Speyer -20 is used here, +37 cm against the official rule. At high water Marke I is at 620 cm and Marke II — above which the waterway closes — at 730 cm. This gauge has 2 forecast sources: the 2-day forecast from the Hochwasserzentrale Rheinland-Pfalz (red) and the 10-day forecast from the Hochwasservorhersagezentrale Baden-Württemberg (yellow). Upstream lies Maxau, downstream Mannheim.
Warning: HVZ Baden-Württemberg forecast
Warning. The forecast may contain inaccuracies. The forecast data for this gauge is (partly) sourced from the Hochwasservorhersagezentrale Baden-Württemberg. The small chart you see when clicking the hyperlink for this gauge is the only format in which this public authority publishes its forecast. Unfortunately, the digitisation has only resulted in a very low‑resolution image. The algorithm that converts that image back into numeric values for this table may sometimes be wrong because it must OCR axis labels that are also low resolution, and cannot be guaranteed 100% correct. Always verify the original chart if the numbers appear implausible.