Canada
United States
Belgium
France
Ireland
Netherlands
United Kingdom
Austria
Czechia
Germany
Poland
Slovenia
Switzerland
Italy
Spain
Türkiye
Denmark
Finland
Norway
SwedenRideau River below Merrickville water level
River gauge, Rideau River, Ontario, Canada
Right now
Very high for mid-October
Water level
- Flow
- 21.2 m³/s
History
20252026
What this means
The Rideau River below Merrickville is well above normal at 4.63 m.
The median for mid-October is 4.45 m, based on 6 years of readings, so the water level is 0.18 m above typical. On the same day last year the reading was 4.41 m, a difference of +0.22 m.
It has barely moved over the past 24 hours. In the last month it has stayed between 4.43 m and 4.70 m.
That stands out in fall, when many rivers are usually near their lowest.
Compared with 6 years of daily readings for this time of year. How to read levels
Key numbers
- Median for this date
- 4.45 m0.18 m above the median for this date
- Normal for this date
- 4.41 m – 4.54 m8 years in 10 fall in this range (6 years of records)
- Same day last year
- 4.41 m+0.22 m
- Lowest and highest in 30 days
- 4.43 m – 4.70 m
- Lowest and highest in 12 months
- 4.41 m – 4.65 m
Flood levels and safety
A high reading on its own does not mean property is at risk. The warnings issued by the provincial river forecast centre take local defences and the forecast into account.
Readings can change quickly after heavy rain upstream, so check again before heading near the water.
About the Rideau River
The Rideau River is a river in Eastern Ontario, Canada. The river flows north from Upper Rideau Lake and empties into the Ottawa River at the Rideau Falls in Ottawa, Ontario. Its length is 146 kilometres (91 mi).
Text and image from Wikipedia and Wikimedia Commons, licensed under CC BY-SA.
Weather at the gauge
Rain in the last 3 days: 12 mm. Rain that falls upstream can take hours or days to show up at a river gauge.
Forecast: Open-Meteo
Map
Other gauges on the Rideau River
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| Rideau River below ManotickRiver gauge, Rideau River | 4.40 m | Very high | −0.02 m | 34 km |
| Rideau River at OttawaRiver gauge, Rideau River | 3.39 m | Very high | ±0 | 49 km |
| Rideau River above Rideau FallsRiver gauge, Rideau River | 5.00 m | Very high | +0.02 m | 55 km |
Nearby gauges
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| Kemptville Creek near KemptvilleRiver gauge, Kemptville Creek | 6.15 m | Very high | −0.01 m | 13 km |
| North Branch South Nation River near HeckstonRiver gauge, North Branch South Nation River | 1.23 m | Very high | −0.16 m | 24 km |
| South Nation River at SpencervilleRiver gauge, South Nation River | 11.15 m | Very high | ±0 | 25 km |
| Jock River near RichmondRiver gauge, Jock River | 6.58 m | Very high | −0.01 m | 33 km |
| Tay River in PerthRiver gauge, Tay River | 7.28 m | Low | −0.01 m | 35 km |
| Mississippi River at AppletonRiver gauge, Mississippi River | 1.73 m | Normal | +0.03 m | 35 km |
| South Branch South Nation River near Winchester SpringsRiver gauge, South Branch South Nation River | 7.78 m | Very high | −0.31 m | 36 km |
| Mississippi River at Fergusons FallsRiver gauge, Mississippi River | 3.08 m | High | +0.02 m | 38 km |
Questions and answers
Is the Rideau River below Merrickville higher than last year?
Yes, it is 0.22 m higher than on the same day last year, when the reading was 4.41 m.
What is a normal level for the Rideau River below Merrickville in mid-October?
The median for mid-October is 4.45 m. In 8 years out of 10 the reading falls between 4.41 m and 4.54 m, based on 6 years of records.
Is the river level the same as the depth of the water?
No. The reading is measured from a fixed zero mark at the gauge, so 4.63 m on the gauge does not mean the water is that deep.
What is the water level of Rideau River below Merrickville today?
On Oct 18, 2026, 10:30 AM EDT, the water level was 4.63 m. Steady over the last 24 hours.
Is Rideau River below Merrickville rising or falling?
Steady over the last 24 hours. Up 0.16 m over the last 7 days.
Is the level of Rideau River below Merrickville normal?
Very high for mid-October. Compared with 6 years of daily readings for this time of year.
How often is this data updated?
Environment and Climate Change Canada – Water Survey of Canada publishes a new reading every hour. This page refreshes within minutes of each update.
For specialists
Station codes, datum, parameters, data quality and downloads
- Operator
- Environment and Climate Change Canada – Water Survey of Canada
- Station code
eccc:02LA011(Agency page)- Coordinates
44.94995, -75.81912(WGS84)- Vertical datum
- station datum (assumed datum)
- Update interval
- every hour
- Licence
- Open Government Licence – Canada. Contains information licensed under the Open Government Licence – Canada
Published series
| Parameter | Last value | Time (UTC) | Quality |
|---|---|---|---|
| Water level | 4.63 m | 2026-10-18 14:30 | Provisional |
| Flow | 21.2 m³/s | 2026-10-18 14:30 | Provisional |
Download
Embed this gauge
Add a live card for this gauge to your website. It updates on its own and links back here.
How to cite
Environment and Climate Change Canada – Water Survey of Canada: Rideau River below Merrickville (eccc:02LA011). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/canada/ontario/rideau-river-below-merrickville
How we check values
Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.
Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer