Mary Lake at Port Sydney
Water level and flow at gauge 02EB021, Ontario. The level is below normal for October. In the last 24 hours it has been steady.
Latest reading Oct 25, 6 AM local standard time (3 hours ago) · data checked · we check every 30 minutes
Compared with a normal October
Normal for October (middle half of 22 years of monthly averages): 8.47 m27.80 ft – 8.53 m27.98 ft, median 8.50 m27.90 ft.
April 27, 2019 · approved records 2003–2024 (HYDAT). Right now the level is 1.05 m3.46 ft below that record.
Last 30 days
Hourly readings · shaded: normal range for this month
This year compared with past years
Daily water level
Normal range: monthly averages of 22 years (lighter band: 10th–90th percentile). Past years: approved daily means from HYDAT, the Water Survey of Canada archive (the latest year published is 2025). 2026: daily means of the provisional real-time readings collected by Canada River Levels since October 22, 2026.
Weather near this gauge
Sunny. Becoming a mix of sun and cloud this afternoon. Fog patches dissipating this morning. Wind becoming southwest 20 km/h late this morning. High 17. UV index 3 or moderate.
Mainly cloudy. 40 percent chance of showers late this evening and overnight. Low 9.
Mainly cloudy. 40 percent chance of showers early in the morning. Wind north 20 km/h becoming light late in the morning. High 11. UV index 2 or low.
Cloudy periods. Low minus 6.
Forecast for Huntsville (13 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| North Branch Muskoka RiverPort Sydney · 1 km | 0.74 m2.41 ft | Below normal |
| Fairy LakeHuntsville · 13 km | 6.25 m20.51 ft | Very low |
| Lake of BaysBaysville · 15 km | 10.21 m33.51 ft | Normal |
| South Branch Muskoka RiverBaysville · 15 km | 7.42 m24.35 ft | Very low |
| Big East RiverHuntsville · 21 km | 5.12 m16.80 ft | Very low |
| Lake MuskokaBeaumaris · 24 km | 9.32 m30.56 ft | Below normal |
About this gauge
Station: 02EB021 · Mary Lake at Port Sydney
Location: 45.2199, -79.2764 · Ontario
Water levels are measured from a local reference point at each gauge, not from sea level, so they cannot be compared between gauges.
Official sources
For flood warnings, advisories and approved data, always use these official services:
Questions
What is the water level of the Mary Lake at Port Sydney today?
The latest reading (Oct 25, 6 AM, local standard time) is 8.47 m (27.79 ft).
Is the Mary Lake at Port Sydney high right now?
The level is below normal for October.
Is the Mary Lake rising or falling?
In the last 24 hours it has been steady.
What is the highest water level ever recorded on the Mary Lake at Port Sydney?
9.52 m (31.25 ft) on April 27, 2019, the highest instantaneous level in the approved records of the Water Survey of Canada (2003–2024). Events after 2024 are not yet in the approved archive.
Where does this data come from?
Gauge 02EB021 of the Water Survey of Canada (Environment and Climate Change Canada). Real-time data are provisional and may be revised. We check for new readings every 30 minutes. Canada River Levels is not an official source.