What is the current water level of Mary Lake?

The current water level of Mary Lake (Ontario) is 8.50 m, measured Nov 4, 8:45 a.m. at Water Survey of Canada gauge 02EB021.

Is the water level at Mary Lake rising or falling?

The level is currently rising: 0.03 m over the past seven days.

How does the current level compare with the last 16 days?

Over the past 16 days the gauge ranged from 8.47 to 8.50 m. The current reading sits near the top of that range.

Where does the water level data for Mary Lake come from?

Readings come from the Mary Lake At Port Sydney gauge (02EB021) in Water Survey of Canada's realtime hydrometric network (ECCC), refreshed every 5 minutes to an hour depending on the station — loaded server-side on this page, fresh on every visit.

Mary Lake water level

Water level recorded at Water Survey of Canada gauge 02EB021, refreshed every 5 minutes to an hour depending on the station.

Good to know 📏 Reading Water Survey of Canada gauges: what the level number means 💨 Gust factor: an indicator of jibe-crash risk

Current level

8.50m

measured Nov 4, 8:45 a.m.

24-hour change

+0.01m

rising

7-day change

+0.03m

rising

Range (16 days)

8.47–8.50m

lowest to highest daily reading

Water levels, day by day

Date	Water level	Δ vs previous day
Nov 4●	8.50	0
Nov 3	8.50	↑ 0.01
Nov 2	8.50	0
Nov 1	8.49	↑ 0.01
Oct 31	8.49	0
Oct 30	8.48	0
Oct 29	8.48	0
Oct 28	8.47	0
Oct 27	8.47	0
Oct 26	8.47	0
Oct 25	8.47	0
Oct 24	8.47	0
Oct 23	8.47	↓ 0.01
Oct 22	8.48	0

Readings fetched Nov 4, 9:41 a.m. (just now); the chart below loads the current trace live from Water Survey of Canada.

Mary Lake water level — common questions

What is the current water level of Mary Lake?: The current water level of Mary Lake (Ontario) is 8.50 m, measured Nov 4, 8:45 a.m. at Water Survey of Canada gauge 02EB021.
Is the water level at Mary Lake rising or falling?: The level is currently rising: 0.03 m over the past seven days.
How does the current level compare with the last 16 days?: Over the past 16 days the gauge ranged from 8.47 to 8.50 m. The current reading sits near the top of that range.
Where does the water level data for Mary Lake come from?: Readings come from the Mary Lake At Port Sydney gauge (02EB021) in Water Survey of Canada's realtime hydrometric network (ECCC), refreshed every 5 minutes to an hour depending on the station — loaded server-side on this page, fresh on every visit.

Water level history

Water level · WSC gauge 02EB021

Reading the chart. Water Survey of Canada gauges report water level in metres above the station’s datum. The absolute number matters less than the trend: a falling level means shrinking launch depth and exposed shoals, a rising one means floating debris and lost beach.

Water levels respond to dam operations, irrigation drawdown, snowmelt, and recent rainfall. For launch decisions, combine the trend here with the wind forecast — low water plus strong wind makes steep, tired ramps.