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747.20m a.s.l.
Measurement disrupted
Due to the extremely low water level of Lac des Brenets, the level measuring installations can no longer provide reliable data.
View the Federal Office for the Environment’s noticeLac des Brenets, Les Brenets · Bundesamt für Umwelt (BAFU)
Change across the visible readings
-100 cm
11/01 – 11/08
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Data & tools for Lake Brenets
Explore and compare
Reading and sourceBundesamt für Umwelt (BAFU) · 13 minutes ago
Basis of comparisonCurrent official reading and matching readings from the same station.
CalculationSeepegel derives deviation and trend transparently from the listed measurements.
Lac des Brenets, Les Brenets
Measurement at the lake. Inflow and outflow stations are identified separately.
Amtlicher Seepegel, BAFU-Station 2057
Measurement time: Nov 8, 2026, 1:20 AM
Bundesamt für Umwelt (BAFU) ↗Modelled lake temperature (1 m depth)
Alplakes model calculation, not a direct on-site measurement.
Operationelles Simstrat-1D-Modell von Alplakes/Eawag, Temperatur in 1 m Tiefe; modellierter Wert, keine lokale Messung
Measurement time: Nov 7, 2026, 11:00 PM
Alplakes (Eawag) – Simstrat-Modell ↗Water temperature compared with usual
Normal — Within the normal range for this calendar day (reference period 2023–2026).
Values for this time of year are compared over 2023–2026. The middle 50% lie between 7.0 °C and 8.2 °C. Below the 5th-percentile boundary (6.3 °C) is very low; above the 95th-percentile boundary (8.7 °C) is very high.
This seasonal assessment uses published quantiles. It is not a return period or forecast and cannot count individual historical years.
Show us your lake or river. Selected photos will appear here with your name after our review.
How to read the chart: the thick line is the current year, the thin one the median of the 1991-2020 reference period. The shaded band shows the normal range (25th–75th percentile), the dotted lines the maximum and minimum. Values above the band are unusually high for the season, below unusually low – but not an official warning.
Today at the lake
A factual data summary – not a safety or swimming clearance.
Water temperature
7.2 °C
Rather cool
Wind
4.3 km/h
Calm
Precipitation, 24h
0.3 mm
Some rain
2.3 mm in 48 h · 2.3 mm over 7 days · Gusts 9.7 km/h · 90 % humidity
Source: MeteoSwiss, station La Chaux-de-Fonds · 33 minutes ago
No protection needed.
Source: Open-Meteo
Drag the timeline to compare the daily archive images.
What is the water level of Lake Brenets? See the latest available level, its measurement time and source. Compare readings from the same station to understand the trend.
Seepegel analysis
The main station at Lac des Brenets, Les Brenets reports a water level of 747.20 m a.s.l. at Nov 8, 2026, 1:20 AM. The series is provided by Bundesamt für Umwelt (BAFU). This value is the elevation of the water surface above the official height datum, not the water depth at the shore.
A natural border lake on the Doubs, where water leaves through both the visible outlet and the limestone below.
Profile and backgroundLac des Brenets is a reservoir section of the Doubs on the Swiss–French border.
This overview includes 2 monitoring stations for water level and water temperature. Not every station provides every measurement. Track changes at the same station, checking the timestamp, unit and source notes.
The curve shows recent level changes. A seasonal median, where available, compares the same time of year. Water can rise while remaining below that median: trend and comparison answer different questions. Neither replaces an official warning.
Data status
