Ottawa River at Mattawa water level

Name: Ottawa River at Mattawa water level (Environment and Climate Change Canada – Water Survey of Canada)
Creator: Environment and Climate Change Canada – Water Survey of Canada
License: https://open.canada.ca/en/open-government-licence-canada

River gauge, Ottawa River, Ontario, Canada

Directions

Very low for mid-October

Water level

52.25m Up 0.03 m over the last 24 hours

Measured Oct 18, 2026, 11:45 AM EDT (56 min ago)

History

7 days 30 days 1 year Years compared

20252026

Water level Normal range (10–90 %)

What this means

At 52.25 m, the Ottawa River at Mattawa is far below normal for mid-October.

The median for mid-October is 52.52 m, based on 21 years of readings, so the water level is 0.27 m below typical. On the same day last year the reading was 52.32 m, a difference of −0.06 m.

The water is rising: up 0.03 m over the past 24 hours. Over the past 30 days it has moved between 52.05 m and 52.73 m.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that.

Compared with 21 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 52.52 m0.27 m below the median for this date
Normal for this date: 52.29 m – 53.27 m8 years in 10 fall in this range (21 years of records)
Same day last year: 52.32 m−0.06 m
Lowest and highest in 30 days: 52.05 m – 52.73 m
Lowest and highest in 12 months: 52.12 m – 52.49 m

Conditions at Ottawa River at Mattawa

Low water means shallow riffles on canoe trips and warmer water for fish.

Flood advisories come from the provincial river forecast centre.

About the Ottawa River

The Ottawa River is a river in the Canadian provinces of Ontario and Quebec. It is named after the Algonquin word "to trade", as it was the major trade route of Eastern Canada at the time. For most of its length, it defines the border between these two provinces. It is a major tributary of the St. Lawrence River and the longest river in Quebec.

Weather at the gauge

Rain in the last 3 days: 10 mm. Rain that falls upstream can take hours or days to show up at a river gauge.

18 Sun 15° 2° – Wind 19 km/h

19 Mon 15° 4° – Wind 15 km/h

20 Tue 14° 3° – Wind 10 km/h

21 Wed 15° 2° – Wind 8 km/h

22 Thu 14° 4° – Wind 10 km/h

23 Fri 12° 1° – Wind 7 km/h

24 Sat 14° 0° – Wind 17 km/h

Forecast: Open-Meteo

Sunrise 07:37 AM Sunset 06:25 PM Daylight 10 hr, 48 min First quarter 51%

Map

Other gauges on the Ottawa River

Gauge	Level	Compared with normal	24 hours	Distance
Ottawa River at ThorneRiver gauge, Ottawa River	9.61 m	Normal	+0.03 m	52 km

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Mattawa River below Bouillon LakeRiver gauge, Mattawa River	8.48 m	No reference yet	+0.02 m	15 km
Aumond Creek near MattawaRiver gauge, Aumond Creek	3.64 m	Normal	±0	18 km
Wasi River near AstorvilleRiver gauge, Wasi River	8.01 m	Very low	−0.01 m	49 km
La Vase River at North BayRiver gauge, La Vase River	10.72 m	Normal	−0.10 m	53 km
Lac Témiscamingue à TémiscamingLake, Lac Témiscamingue	5.05 m	Low	−0.02 m	54 km
Chippewa Creek at North BayRiver gauge, Chippewa Creek	13.23 m	Low	−0.02 m	57 km
Lake Nipissing at North BayLake, Lake Nipissing	5.66 m	Normal	−0.01 m	59 km
Lake Timiskaming at McLarens PointLake, Lake Timiskaming	99.11 m	No reference yet	±0	72 km

Questions and answers

Is the Ottawa River at Mattawa higher than last year?

No, it is 0.06 m lower than on the same day last year, when the reading was 52.32 m.

What is a normal level for the Ottawa River at Mattawa in mid-October?

The median for mid-October is 52.52 m. In 8 years out of 10 the reading falls between 52.29 m and 53.27 m, based on 21 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 52.25 m on the gauge does not mean the water is that deep.

What is the water level of Ottawa River at Mattawa today?

On Oct 18, 2026, 11:45 AM EDT, the water level was 52.25 m. Up 0.03 m over the last 24 hours.

Is Ottawa River at Mattawa rising or falling?

Up 0.03 m over the last 24 hours. Up 0.07 m over the last 7 days.

Is the level of Ottawa River at Mattawa normal?

Very low for mid-October. Compared with 21 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:02JE013 (Agency page)
Coordinates: 46.32042, -78.71078 (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	52.25 m	2026-10-18 15:45	Provisional

Download

Embed this gauge

Add a live card for this gauge to your website. It updates on its own and links back here.

<iframe src="https://nivelmap.com/embed/19886?lang=en" width="360" height="230" style="border:0;max-width:100%" loading="lazy" title="Ottawa River at Mattawa water level"></iframe>

How to cite

Environment and Climate Change Canada – Water Survey of Canada: Ottawa River at Mattawa (eccc:02JE013). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/canada/ontario/ottawa-river-at-mattawa

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