Mary Lake
43.9519° N, 79.5461° W
Shoreline and neighbouring water from open government data.
Download the map (SVG)Mary Lake, Ontario. 43.9519° N, 79.5461° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/mary-lake-near-vaughan/, compiled October 9, 2026
- Canadian Geographical Names Database, Natural Resources Canada. Contains information licensed under the Open Government Licence – Canada.
- HydroLAKES v1.0, Messager et al. 2016 / WWF HydroSHEDS. Licensed under CC BY 4.0.
- Census boundaries and population, 2021, Statistics Canada. Adapted from Statistics Canada. This does not constitute an endorsement by Statistics Canada.
- Aquatic Resource Area survey points, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
- Fisheries Management Zones, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
- Lake Partner Program, Ontario Ministry of the Environment, Conservation and Parks. Contains information licensed under the Open Government Licence – Ontario.
- City page weather forecasts and alerts, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- Air Quality Health Index observations and forecasts, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
Mary Lake covers 0.19 km², making it smaller than 81% of the 18,731 lakes in Ontario. It lies 2.4 km northwest of Heritage Park.
Government surveys have recorded 6 fish species here, including northern pike, largemouth bass and pumpkinseed.
- Area
- 0.19 km²
- smaller than 81% of the 18,731 lakes in Ontario
- Shoreline
- 2.4 km
- shorter than 84% of the 18,731 lakes in Ontario
- Water clarity
- 3.8 mSecchi depth, 2013
- clearer than 58% of the 1,251 monitored lakes in Ontario
- Fish species
- 6
- more than 61% of the 2,454 surveyed lakes in Ontario
- Elevation
- 296 m
Today on the water
7.6 °C
Observed at Vaughan, as of 5:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 12 p.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast shore.
| Time | 6 a.m. | 9 a.m. | 12 p.m. | 3 p.m. | 6 p.m. | 9 p.m. | 12 a.m. | 3 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 | var. 5 |
| Gusts km/h | 50 | 50 | ||||||
| Waves (est.) m | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | |||
| Temp. °C | 6 | 10 | 14 | 17 | 16 | 11 | 7 | 5 |
| Precip. % | 40 | 40 | 40 | 20 | 20 | 0 | 0 | 0 |
Today: A mix of sun and cloud. 40 percent chance of showers this morning and early this afternoon. Wind becoming northwest 30 km/h gusting to 50 near noon. High 18. UV index 4 or moderate.
Weather: Vaughan (local forecast), as of 5:02 a.m. EDT
Sun and moon
- Civil dawn
- 6:56 a.m.
- Sunrise
- 7:25 a.m.
- Sunset
- 6:44 p.m.
- Civil dusk
- 7:13 p.m.
- Moonrise
- 6:18 a.m.
- Moonset
- 6:03 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
1 low risk
Newmarket, as of 4:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Fish
Sport fish by the share of the 7 government surveys (1400–1997) that recorded them.
Other species (1)
- Brown Bullhead 2
Numbers are the surveys that recorded each species.
Fishing regulations: Fisheries Management Zone 16. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 10 years between 2002 and 2013; the latest annual mean is 3.8 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.