Rhine Water Levels 2026: Kaub Gauge Breaches the Critical Low-Water Line
Rhine river levels are near 40 cm at Kaub today, barges are sailing a fifth full.
We've tracked the Rhine since spring. In April we called the falling Kaub gauge an early warning light for the logistics industry. In June we said that light had turned amber. Today it is red - and the market is feeling it.
How low are the Rhine water levels right now?
As of today, 15 July 2026, the Rhine water level at the Kaub gauge is around 40 cm. For context, it was ~106 cm when we published on 22 June, and ~140 cm at its late-May high.
So, the answer is: the Rhine is very low right now - historically low for mid-July, weeks before the traditional low-water season starts.
The Kaub gauge, on the Middle Rhine between Koblenz and Mainz, sits at the shallowest chokepoint on the river. It sets the maximum draft and, therefore, the laden weight for every barge moving between the ARA seaports and the industrial hinterland of the Rhine valley, shared by Germany, France and Switzerland. Kaub is the reference gauge river carriers use to set low-water surcharges. The long-term average Rhine water level at Kaub is 208 cm.
Two thresholds matter now:
The GlW (Equivalent Water Level) of 77 cm at Kaub - the line below which barging becomes structurally uneconomic - has been broken, and we are well beneath it.
Around 40 cm, commercial shipping is typically suspended or operates in emergency mode. We are at that door now. The all-time record low Rhine water level at Kaub is 25 cm, set on 22 October 2018.
How do 2026 Rhine levels compare to 2018 and 2022?
We went through the historical Kaub records for summer months, and the calendar is the alarming part:
In 2018 - the benchmark Rhine drought year, Kaub average was ~220 cm in June and ~120 cm in July, eventually hitting the all-time record of 25 cm in October, triggering severe draft limits, steep low-water surcharges, and production and logistics strain across the chemical and fuel supply chains along the river for weeks.
In 2022 - the year the Rhine was only briefly effectively closed and German industry hit with bottlenecks and production declines, the July monthly mean was about 100 cm, and the low didn’t bottom out (near 32 cm) until mid-August.
In 2026, we are already near 40 cm in mid-July. If the dry pattern holds, the 2018’s October record of 25 cm might be within reach this summer.
Rhine water level forecast: what happens next?
The German Federal Institute of Hydrology (BfG) 14-day probabilistic forecast, issued today, points to a flicker of relief followed by a relapse:
Kaub is near-certain to stay below 77 cm GlW through roughly 17 July.
Rain forecast in southern Germany should bring a brief bump over 77 cm around 20–22 Jul - that is the threshold to reach to make shipping barely viable.
The forecast scales back to disruption territory after July 24, with 80%+ probability of staying under GlW until end of July.
In plain terms: expect a short, weather-driven reprieve for Rhine water levels in a few days, but not a trend reversal. Getting back to genuinely unrestricted navigation would require weeks of frequent rain across the Alpine and upper-Rhine catchment areas, and nothing in the current forecasts promises that within a reasonable forecasting horizon.
The disruption is no longer a forecast - it’s happening
Between our June note and today, the consequences moved from projection to headline. What’s widely being reported in the media across the market this week:
Barges are sailing about 20% full. A tanker barge that carries ~1,200 tonnes past Duisburg is limited to roughly 460 tonnes through Kaub.
Rates are spiking. Rotterdam–Karlsruhe tanker freight has climbed to €60–70 per tonne, up from ~€45 in late June, according to media reports.
Some operators have suspended their own barge fleets and are chartering shallow-draft vessels to keep partial service running.
Industrial exposure is building. Germany’s chemical association has signaled (per Reuters) that the sector is better prepared than it was in 2018 and that the effects are manageable for now. Analysts have also warned that a full Rhine closure for fuel distribution could require thousands of additional road tankers, potentially leading to higher pump prices in western Germany.
That last point is particularly crucial for our readers: one of the fallback plans for critical cargo deliveries is the road.
What low Rhine water levels mean for road freight
The cargo spill into the truck market is the same mechanism we’ve warned about earlier, only now it’s live. As barge payloads collapse, cargo either has to wait or move to other modes, which effectively means road or rail. A single bulk or general cargo barge equals 50 to 150 truckloads, so you wouldn’t need many diverted sailings to move the market needle.
The difference from prior drought years is the state of the road market underneath it. In 2018 and 2022 there was some slack to absorb diverted volume. In 2026 there is not. Capacity across Central and Western Europe is thin. A few hundred unplanned FTL spot requests per week in the Rhine corridor will push carrier rejection rates up and drag spot rates higher, and that pressure tends to arrive suddenly rather than gradually.
The bottom line
In April this was an early warning. In June it was amber. Today it is red, and the market is already paying low-water surcharges and splitting cargo across half-empty vessels. If you are directly affected by the developments, you have probably already activated your contingency plans. If you are only tangentially connected to these markets, have plans ready and be aware of possible local road capacity swings, particularly on liquid bulk road transport market.
And then pray for summer rain and check developments to see whether the road or rail markets in the affected areas will cross their own red lines. We’ll keep watching the water, so you can keep an eye on the road.
Oleksandr Kulish
Senior Consultant
Trimble Transportation (Transporeon)
Data: Kaub gauge readings via PEGELONLINE/WSV; 14-day forecast by the German Federal Institute of Hydrology (BfG), CC BY 4.0; figures summarized by the author. Market figures per Reuters.