Nottawasaga River near Alliston water level

Name: Nottawasaga River near Alliston 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, Nottawasaga River, Ontario, Canada

Directions

Normal for mid-October

Water level

6.73m Steady over the last 24 hours

Measured Oct 19, 2026, 01:05 PM EDT (1 hour ago)

Flow: 1.66 m³/s

History

7 days 30 days 1 year Years compared

20252026

Water level Normal range (10–90 %)

What this means

Water levels are unremarkable at Nottawasaga River near Alliston, where the gauge shows 6.73 m.

The median for mid-October is 6.77 m, based on 21 years of readings, so the water level is 0.04 m below typical. On the same day last year the reading was 6.76 m, a difference of −0.02 m.

It has barely moved over the past 24 hours. The 30-day range is 6.71 m – 6.81 m.

Fall is often low-water season on rivers, until steadier rain returns.

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

Key numbers

Median for this date: 6.77 m0.04 m below the median for this date
Normal for this date: 6.69 m – 6.90 m8 years in 10 fall in this range (21 years of records)
Same day last year: 6.76 m−0.02 m
Lowest and highest in 30 days: 6.71 m – 6.81 m
Lowest and highest in 12 months: 6.72 m – 7.24 m

Freshet, ice and paddling

Open-water season is the time for canoe trips and fishing, though rapids change character with every few centimetres of water.

Flood advisories come from the provincial river forecast centre.

About the Nottawasaga River

The Nottawasaga River is a river in Simcoe County and Dufferin County in Central Ontario, Canada. It is part of the Great Lakes Basin, and is a tributary of Lake Huron. The river flows from the Orangeville Reservoir in the town of Orangeville, Dufferin County, through the Niagara Escarpment and the Minesing Wetlands, the latter a wetland of international significance, and empties into Nottawasaga Bay, an inlet of Georgian Bay on Lake Huron, at the town of Wasaga Beach, Simcoe County.

Weather at the gauge

Rain in the last 3 days: 6.1 mm. Rain that falls upstream can take hours or days to show up at a river gauge.

19 Mon 20° 4° – Wind 27 km/h

20 Tue 15° 4° – Wind 11 km/h

21 Wed 16° 2° – Wind 9 km/h

22 Thu 18° 6° – Wind 14 km/h

23 Fri 14° 5° – Wind 15 km/h

24 Sat 17° 3° – Wind 13 km/h

25 Sun 19° 7° – Wind 26 km/h

Forecast: Open-Meteo

Sunrise 07:40 AM Sunset 06:31 PM Daylight 10 hr, 51 min First quarter 61%

Map

Other gauges on the Nottawasaga River

Gauge	Level	Compared with normal	24 hours	Distance
Nottawasaga River at HockleyRiver gauge, Nottawasaga River	0.68 m	Low	−0.01 m	11 km
Nottawasaga River near BaxterRiver gauge, Nottawasaga River	5.47 m	Normal	−0.03 m	16 km
Nottawasaga River near EdenvaleRiver gauge, Nottawasaga River	4.43 m	Normal	−0.03 m	42 km

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Boyne River at Earl Rowe ParkRiver gauge, Boyne River	2.85 m	Normal	−0.02 m	4.7 km
Innisfil Creek near AllistonRiver gauge, Innisfil Creek	1.96 m	Normal	−0.03 m	9.0 km
Beeton Creek near TottenhamRiver gauge, Beeton Creek	5.68 m	Normal	±0	9.7 km
Pine River near EverettRiver gauge, Pine River	−0.03 m	Very low	−0.01 m	11 km
Humber River at Highway No. 9River gauge, Humber River	2.22 m	Low	+0.01 m	16 km
Schomberg River near SchombergRiver gauge, Schomberg River	1.35 m	Normal	+0.03 m	20 km
Humber River near PalgraveRiver gauge, Humber River	8.20 m	Low	−0.01 m	21 km
Mad River at AveningRiver gauge, Mad River	1.04 m	Low	−0.03 m	26 km

Questions and answers

Is the Nottawasaga River near Alliston higher than last year?

No, it is 0.02 m lower than on the same day last year, when the reading was 6.76 m.

What is a normal level for the Nottawasaga River near Alliston in mid-October?

The median for mid-October is 6.77 m. In 8 years out of 10 the reading falls between 6.69 m and 6.90 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 6.73 m on the gauge does not mean the water is that deep.

What is the water level of Nottawasaga River near Alliston today?

On Oct 19, 2026, 01:05 PM EDT, the water level was 6.73 m. Steady over the last 24 hours.

Is Nottawasaga River near Alliston rising or falling?

Steady over the last 24 hours. Steady over the last 7 days.

Is the level of Nottawasaga River near Alliston normal?

Normal 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:02ED101 (Agency page)
Coordinates: 44.11058, -79.89028 (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	6.73 m	2026-10-19 17:05	Provisional
Flow	1.66 m³/s	2026-10-19 17:05	Provisional

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How to cite

Environment and Climate Change Canada – Water Survey of Canada: Nottawasaga River near Alliston (eccc:02ED101). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/canada/ontario/nottawasaga-river-near-alliston

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