Surprise Lake
48.6209° N, 89.3341° W
Shoreline and neighbouring water from open government data.
Download the map (SVG)Surprise Lake, Ontario. 48.6209° N, 89.3341° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/surprise-lake-near-thunder-bay/, 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.
- Fishing access 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).
Surprise Lake covers 0.48 km², making it smaller than 51% of the 18,731 lakes in Ontario. It lies 3.5 km north of Lappe.
- Area
- 0.48 km²
- smaller than 51% of the 18,731 lakes in Ontario
- Shoreline
- 5.8 km
- longer than 55% of the 18,731 lakes in Ontario
- Water clarity
- 1.9 mSecchi depth, 2024
- less clear than 87% of the 1,251 monitored lakes in Ontario
- Elevation
- 456 m
Today on the water
0 °C
Observed at Thunder Bay, as of 4:00 a.m. EDT
calm Estimated waves, next 12 hours: up to 0.1 m.
| Time | 5 a.m. | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. | 2 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | var. 5 | var. 5 | SE 10 | SE 10 | E 20 | SE 20 | SE 15 | SE 10 |
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |||
| Temp. °C | 1 | -1 | 7 | 13 | 14 | 9 | 9 | 10 |
| Precip. % | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Tonight: Partly cloudy with 40 percent chance of showers early this evening. Clearing this evening. Wind west 20 km/h becoming light this evening. Low minus 1.
Weather: Thunder Bay (local forecast), as of 4:01 a.m. EDT
Sun and moon
- Civil dawn
- 7:37 a.m.
- Sunrise
- 8:08 a.m.
- Sunset
- 7:19 p.m.
- Civil dusk
- 7:51 p.m.
- Moonrise
- 7:01 a.m.
- Moonset
- 6:38 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
1 low risk
Thunder Bay, as of 4:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Water
Clarity was measured with a Secchi disk in 3 years between 2017 and 2024; the latest annual mean is 1.9 m.
Getting on the water
1 listed boat launch; 1 with parking listed. marks launches on the map.
- Suprise Lake Access
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.