St. Mary Lake
48.8917° N, 123.5456° W
Shoreline and neighbouring water from open government data.
Download the map (SVG)St. Mary Lake, British Columbia. 48.8917° N, 123.5456° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/bc/st-mary-lake-near-duncan/, 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.
- Known BC Fish Observations and BC Fish Distributions, Government of British Columbia. Contains information licensed under the Open Government Licence – British Columbia.
- Bathymetric Maps – Open, Government of British Columbia. Contains information licensed under the Open Government Licence – British Columbia.
- Wildlife Management Units, Government of British Columbia. Contains information licensed under the Open Government Licence – British Columbia.
- Real-time hydrometric data, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- National Water Data Archive (HYDAT) daily means, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- 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).
St. Mary Lake covers 1.78 km², making it larger than 81% of the 4,577 lakes in British Columbia. It lies 1.6 km southwest of Fernwood.
Government surveys have recorded 5 fish species here, including cutthroat trout, rainbow trout and steelhead.
- Area
- 1.78 km²
- larger than 81% of the 4,577 lakes in British Columbia
- Shoreline
- 7.7 km
- longer than 75% of the 4,577 lakes in British Columbia
- Fish species
- 5
- more than 70% of the 2,793 surveyed lakes in British Columbia
- Elevation
- 44 m
Today on the water
15.6 °C
Observed at Duncan, as of 1:00 a.m. PDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 3 a.m., wind from the southeast: the southeast shore is sheltered, waves build toward the northwest shore.
| Time | 2 a.m. | 5 a.m. | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | var. 5 | SE 20 | SW 20 | SW 20 | NW 20 | NW 20 | W 10 | W 10 |
| Gusts km/h | 40 | 40 | 40 | 40 | 40 | |||
| Waves (est.) m | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | |||
| Temp. °C | 11 | 11 | 12 | 14 | 16 | 15 | 11 | 8 |
| Precip. % | 20 | 80 | 20 | 20 | 60 | 60 | 30 | 30 |
Tonight: A few clouds. Increasing cloudiness this evening then rain beginning overnight. Wind becoming southeast 20 km/h gusting to 40 except gusting to 60 near the Strait of Georgia overnight. Low 11.
Weather: Duncan (local forecast), as of 1:02 a.m. PDT
Sun and moon
- Civil dawn
- 6:54 a.m.
- Sunrise
- 7:25 a.m.
- Sunset
- 6:36 p.m.
- Civil dusk
- 7:07 p.m.
- Moonrise
- 6:25 a.m.
- Moonset
- 5:56 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
2 low risk
Duncan, as of 1:00 a.m. PDT
Follow this lake by email: a weekly summary of conditions.
Depth
- Official government depth map (PDF)1991 survey
Not for navigation. Depths are from government surveys and may be outdated.
Fish
Sport fish by the share of the 122 government surveys (1920–2026) that recorded them.
Forage fish and other species (1)
- Threespine Stickleback 1
Numbers are the surveys that recorded each species.
Fishing regulations: Region 1 – Vancouver Island. Check seasons and limits before you fish.
Follow this lake
Every Friday by email: the Environment Canada forecast, the water level at the nearest gauge and any weather alerts in effect.