Mary Lake at Port Sydney water level

Name: Mary Lake at Port Sydney 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

Lake, Mary Lake, Ontario, Canada

Directions

High for mid-October

Water level

8.53m Up 0.01 m over the last 24 hours

Measured Oct 16, 2026, 04:45 PM EDT (1 hour ago)

History

7 days 30 days 10 years Years compared

202020212022202320242026

Water level Normal range (10–90 %)

What this means

Mary Lake at Port Sydney is above normal at 8.53 m.

That puts it 0.04 m above the median of 8.49 m for mid-October, based on 11 years of readings.

It has risen 0.01 m over the past 24 hours. In the last month it has stayed between 8.48 m and 8.67 m.

Many reservoirs reach their low point of the year in fall, before winter rain and snow start the refill.

Compared with 11 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 8.49 m0.04 m above the median for this date
Normal for this date: 8.42 m – 8.55 m8 years in 10 fall in this range (11 years of records)
Lowest and highest in 30 days: 8.48 m – 8.67 m

On the water at Mary Lake at Port Sydney

Above-normal levels often mean flooded shoreline trees and debris on the surface. Slow down near the edges.

Wear a life jacket on the water. Most boating deaths involve people who were not wearing one.

Weather at the gauge

The forecast is not available right now.

Sunrise 07:35 AM Sunset 06:32 PM Daylight 10h 57m First quarter 34 %

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
North Branch Muskoka River at Port SydneyRiver gauge, North Branch Muskoka River	0.90 m	Normal	+0.07 m	0.8 km
Fairy Lake at HuntsvilleLake, Fairy Lake	6.28 m	Normal	+0.01 m	13 km
Lake of Bays at BaysvilleLake, Lake of Bays	10.22 m	High	+0.02 m	15 km
South Branch Muskoka River at BaysvilleRiver gauge, South Branch Muskoka River	7.52 m	Very low	+0.01 m	15 km
Big East River near HuntsvilleRiver gauge, Big East River	5.23 m	Low	0.00 m	21 km
Lake Muskoka at BeaumarisLake, Lake Muskoka	9.33 m	Normal	0.00 m	24 km
Oxtongue River near DwightRiver gauge, Oxtongue River	2.91 m	Very low	+0.05 m	25 km
Lake Rosseau at Port CarlingLake, Lake Rosseau	8.80 m	Normal	+0.02 m	26 km

Questions and answers

How often is Mary Lake at Port Sydney updated?

Several times an hour. New readings from Environment and Climate Change Canada – Water Survey of Canada appear here as they arrive. Latest: Oct 16, 2026, 04:45 PM EDT.

Is Mary Lake at Port Sydney rising or falling?

It is rising, by 0.01 m over the past 24 hours.

What is the water level of Mary Lake at Port Sydney today?

On Oct 16, 2026, 04:45 PM EDT, the water level was 8.53 m. Up 0.01 m over the last 24 hours.

Is Mary Lake at Port Sydney rising or falling?

Up 0.01 m over the last 24 hours. Up 0.04 m over the last 7 days.

Is the level of Mary Lake at Port Sydney normal?

High for mid-October. Compared with 11 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.

Where does this data come from?

The values come directly from Environment and Climate Change Canada – Water Survey of Canada, the official operator of this gauge, and are published under the Open Government Licence – Canada. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: Environment and Climate Change Canada – Water Survey of Canada
Station code: eccc:02EB021 (Agency page)
Coordinates: 45.21986, -79.27639 (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 `stage`	8.53 m	2026-10-16 20:45	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/19600?lang=en" width="360" height="230" style="border:0;max-width:100%" loading="lazy" title="Mary Lake at Port Sydney water level"></iframe>

How to cite

Environment and Climate Change Canada – Water Survey of Canada: Mary Lake at Port Sydney (eccc:02EB021). Accessed October 16, 2026 via Nivelmap, https://nivelmap.com/en/canada/ontario/mary-lake-at-port-sydney

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