Current flow: 0.83 m³/s. Navigation is authorized between 1.5 and 52 m³/s. Official SPW data.
⛔
Gendron → Anseremme — Navigation forbidden — 2026-09-29 at 17:04
Today the SPW forbids paddling on the Gendron → Anseremme section (the half-descent to Dinant that we offer). Booking is unavailable until the section reopens.
💧 Flow : 0.83 m³/s📍 Height : 0.162 m🌡️ Water : 16.7°C🌬️ Feels like : 15.4°C🔍 Depth : 35 cm
🛶 Section-by-section — official SPW / ODWB data
Which sections of the Lesse are open today?
The Lesse is split into independently regulated sections by the SPW. One section can be closed (upstream low water) while another stays perfectly navigable — that is why kayaks are out even when a section is forbidden.
The Lesse is navigable by kayak when its flow is between 1.5 and 52.0 m³/s. It is currently 0.8 m³/s: navigation is forbidden. Official SPW data, updated every 15 minutes.
Flow interpretation
What does the Lesse's current flow tell you?
The highlighted row matches your current situation (0.83 m³/s). Hydrometric station SPW 8221 Gendron.
Flow (m³/s)
Level
Status
Interpretation
0 – 1.5
Too low
⛔ Forbidden
No navigation allowed, to protect the rocky bed and the biodiversity of the Lesse.
1.5 – 6
Very calm
⚠️ Caution
Navigable, with the rocky bottom sometimes visible. Suited to experienced paddlers.
6 – 25
Ideal conditions
✅ Allowed
Ideal flow for every level. Clear water, and families are welcome.
25 – 45
Steady current
✅ Allowed
Good flow and a faster descent. Beginners should stay alert.
45 – 52
Strong current
⚠️ Caution
Navigable, but powerful. Not advised for under 8s or absolute beginners.
> 52
Flood — Forbidden
⛔ Forbidden
Flood flow (> 52 m³/s). Navigation forbidden for your safety.
🚩 Official marking
Navigation flags — Lesse in real time
The active flag for a flow of 0.8 m³/s
is the Green flag. The safety rules (age, life jackets, dogs) depend on each flag.
🟢
Green flag
Flow below 10 m³/s
Navigation: Easy
📝 DescriptionPleasant conditions and low water current.
👶 Min. age5 years, with an adult in the same kayak
🦺 Life jacketsMandatory for children under 12 only (provided).
🐕 DogsAllowed
🔵
Blue flag
Flow between 10 and 20 m³/s
Navigation: Careful
📝 DescriptionWater that is slightly cool, and/or a slightly faster current.
👶 Min. age8 years, with an adult in the same kayak
🦺 Life jacketsMandatory for all (provided free of charge).
🐕 DogsNot advised
🟠
Orange flag
Flow between 20 and 30 m³/s
Navigation: Sporty
📝 DescriptionCool temperatures and/or a relatively fast current, so vigilance is required. Follow the instructions for passing the weirs.
👶 Min. age12 years, with an adult in the same kayak
🦺 Life jacketsMandatory for all (provided free of charge).
🐕 DogsForbidden
🔴
Red flag
Flow above 30 m³/s
Navigation: Very sporty
📝 DescriptionA fast current and a high water level. Weir instructions are mandatory. Because capsizing is very likely, this is reserved for people comfortable in water.
👶 Min. age15 years, with an adult in the same kayak
🦺 Life jacketsMandatory for all (provided free of charge).
🐕 DogsForbidden
Flow visualisation (m³/s)
Status: Too low (0.83 m³/s)
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Forecast · flow and weather
Navigation forecast — Lesse
Day-by-day estimate based on the weather forecast and past flow data. The official status is set every day by the SPW.
🔒 No reopening expected until Sunday 4 Oct: the flow should peak around 1.3 m³/s, and 1.5 m³/s is needed to paddle.
Today⛔
29 Sep
Closed
💧 0.8 m³/smeasured
Wednesday⛔
30 Sep
Closed
💧 1 m³/sestimated
Thursday⛔
1 Oct
Closed
💧 1.3 m³/sestimated
Friday⛔
2 Oct
Closed
💧 1.3 m³/sestimated
Saturday⛔
3 Oct
Closed
💧 1.2 m³/sestimated
Sunday⛔
4 Oct
Closed
💧 1.1 m³/sestimated
Water level, safety & regulations — the Lesse
🌊 Water level & navigability
Can you kayak on the Lesse today?
Navigation on the Lesse is currently forbidden. Measured discharge: 0.8 m³/s, height: 0.16 m (reading from 29/09/2026 à 17:00). Navigable threshold: 1.5 to 52.0 m³/s (station SPW 8221 Gendron). Always check the live indicator just before setting off, as the discharge can change quickly.
What is the water level of the Lesse right now?
The current level of the Lesse is 0.16 m for a discharge of 0.8 m³/s, water temperature: 16.7°C.
What is the official navigability threshold for the Lesse?
The Lesse is officially navigable between 1.5 and 52.0 m³/s, measured at station SPW 8221 Gendron. These thresholds are based on the hydrometric network data of the Service Public de Wallonie (SPW) and regional waterway navigation regulations. Full detail on our reference page for navigable flow rates in Wallonia (FR).
Why can navigation be forbidden even in good weather?
A river's level depends on rain that fell upstream, sometimes days earlier and dozens of kilometres away. the Lesse can therefore be in flood under a blue sky. Only the discharge actually measured at the station is authoritative, never the look of the sky.
Can I be alerted when navigation becomes possible again?
Yes. The “Alert me” button, available on the site's water level pages, signs you up for an email notification as soon as the navigation status of the Lesse changes. See the Lesse's live water level.
🎒 Preparing your descent
What is the best time to kayak on the Lesse?
The best period depends on discharge, weather and regulations. Spring and autumn often offer generous discharge; summer is the busiest and can see the level drop during dry spells. The best habit is always to check the discharge on the day itself.
Can you kayak on the Lesse after heavy rain?
Heavy rain can quickly raise the discharge. This can temporarily improve conditions if the level was too low, but a large rise can also make the current dangerous. Check the discharge and any restrictions before setting off.
Can you kayak on the Lesse when it's raining?
Light rain doesn't prevent a descent. However, a thunderstorm, heavy rainfall or a rapid rise in water level can make navigation dangerous. In case of a storm, take shelter and follow safety instructions.
What should I do if the water level changes during my descent on the Lesse?
If you notice a rapid rise in the current, a flood, or a significant deterioration of conditions, reach the bank as soon as possible in a safe area and get out of the water. Do not try to continue your route at all costs.
🛟 Safety
Do you need to know how to swim to kayak on the Lesse?
Knowing how to swim is strongly recommended. Wearing a suitable buoyancy aid remains essential, but it does not replace swimming skills and basic safety rules.
Is a life jacket mandatory?
Always wear a suitable, properly fitted buoyancy aid. It is provided with every rental. Check with the operator which equipment is provided and the rules that apply to your chosen route.
What is the minimum age to kayak on the Lesse?
The minimum age depends on the route, the day's discharge, weather conditions and the operator's rules. Children must be supervised at all times by a responsible adult, in a suitable two-seater or family kayak.
Do you need a wetsuit to paddle on the Lesse?
This mainly depends on water temperature, weather, season and the risk of falling in. The colder the water, the more important a suitable wetsuit becomes. Check the temperature shown on the dashboard before setting off.
What should you do if you capsize (fall in the water) on the Lesse?
Stay calm, stay with your boat if possible and head to a safe bank. Never try to fight against a powerful current.
🗺️ Route
Which kayak route should you choose on the Lesse?
The choice depends on your level, the desired duration, your physical condition and the day's discharge. Short, calm routes suit beginners and families better, while longer routes demand more endurance.
How long does a kayak descent on the Lesse take?
Duration depends on the chosen route, the discharge, the wind, breaks and the participants' level. Times shown on the site are therefore estimates, not guaranteed schedules.
Can you stop during a descent on the Lesse?
Stopping options depend on the route and authorised zones. Respect access points, private property, protected areas and any landing bans.
📅 Booking & conditions
What happens if navigation is forbidden on the day of my booking?
Contact the operator you booked with to find out the options for postponement, cancellation or refund: the exact conditions depend on the specific booking.
Can you book if the water level is currently too low?
Yes, you can check availability for a future date, but a booking does not guarantee navigation conditions: the actual level must always be checked before departure.
When should you check the water level of the Lesse before setting off?
Ideally the day before to plan your visit, then again on the morning itself or just before getting on the water. In unstable weather or heavy rain, check conditions regularly.
🌿 Environment
Why should you respect navigation restrictions on the Lesse?
Restrictions are not only about kayakers' safety: they also help preserve the riverbed, aquatic habitats and sensitive natural areas.
Can you land anywhere along the Lesse?
No. Only use authorised access and landing areas, and respect private property as well as protected natural areas.
How can you kayak without damaging the Lesse?
Leave no litter, avoid touching or moving stones and vegetation, respect sensitive areas and limit noise. Best practice is to leave the river in the same state you found it.
📊 Data & reliability
Where does the discharge data shown on this page come from?
The hydrological data shown is based on information from the Service Public de Wallonie (SPW) measuring stations, supplemented where indicated by weather data and our own forecasting calculations.
Can I use this page as my only source to decide whether to paddle?
No. This page is an information and decision-support tool. Also check any official restrictions, the weather, local conditions and the instructions of the operator or competent authorities before any outing.
Why can the discharge shown here differ from what's shown elsewhere?
Services may use different stations, different measurement times or different calculation methods. Always check the station, the measurement time and the source before comparing two values.
🚨 In case of emergency
What should I do if I fall in the water on the Lesse?
Keep your life jacket on, stay away from obstacles and try to reach a safe area. If you cannot get out of the water or are injured, contact emergency services immediately.
What should I do in case of a sudden flood on the Lesse?
Get out of the water as soon as it can be done safely and move away from the riverbed. Never try to cross a flooded current, and follow the authorities' instructions.
What number should you call in an emergency in Belgium?
Dial 112, Belgium's single emergency number for any intervention by rescue services (police, fire brigade, ambulance).