Long Lake
46.364° N, 81.0957° W
Depth contours from the government survey. Not for navigation.
Download the depth map (SVG)Long Lake, Ontario. 46.364° N, 81.0957° W
Maximum depth 38 m. Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/long-lake-near-grand-sudbury/, 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.
- Bathymetry lines and survey index, Ontario Ministry of Natural Resources. 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).
- Guide to Eating Ontario Fish: Advisory Database, Ontario Ministry of the Environment, Conservation and Parks. Contains information licensed under the Open Government Licence – Ontario.
Long Lake is 38 m deep at its deepest point, deeper than 88% of the 2,688 surveyed lakes in Ontario. It covers 8.62 km² and lies beside Rheault.
Government surveys have recorded 13 fish species here, including walleye, smallmouth bass and cisco.
- Maximum depth
- 38 m
- deeper than 88% of the 2,688 surveyed lakes in Ontario
- Area
- 8.62 km²
- larger than 94% of the 18,731 lakes in Ontario
- Shoreline
- 48.1 km
- longer than 95% of the 18,731 lakes in Ontario
- Water clarity
- 3.6 mSecchi depth, 2025
- clearer than 52% of the 1,251 monitored lakes in Ontario
- Fish species
- 13
- more than 84% of the 2,454 surveyed lakes in Ontario
- Elevation
- 224 m
Today on the water
3.6 °C
Observed at Greater Sudbury, as of 3:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 8 a.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast shore.
| Time | 4 a.m. | 7 a.m. | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 10 | W 10 | NW 20 | NW 20 | NW 20 | NW 10 | var. 5 | SE 10 |
| Gusts km/h | 40 | 40 | ||||||
| Waves (est.) m | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | |||
| Temp. °C | 5 | 4 | 7 | 10 | 12 | 10 | 7 | 5 |
| Precip. % | 30 | 30 | 30 | 20 | 20 | 0 | 0 | 0 |
Tonight: Mainly cloudy with 30 percent chance of showers. Wind west 20 km/h gusting to 40 becoming light this evening. Low plus 4.
Weather: Greater Sudbury (local forecast), as of 3:02 a.m. EDT
Sun and moon
- Civil dawn
- 7:03 a.m.
- Sunrise
- 7:33 a.m.
- Sunset
- 6:48 p.m.
- Civil dusk
- 7:18 p.m.
- Moonrise
- 6:25 a.m.
- Moonset
- 6:07 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
1 low risk
Sudbury, as of 3:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Depth
27% of Long Lake is shallower than 3 m, and 5% is deeper than 20 m.
How to read it: the lake’s area is sorted from the shore to the deepest point. Where the curve is flat, large areas share one depth (flats and weed beds); where it drops, depth changes quickly (drop-offs).
The government depth survey records a maximum depth of 38 m, drawn from 373 depth contours.
- Download the depth map (SVG)Printing this page gives the map on one sheet, with scale and sources.
Not for navigation. Depths are from government surveys and may be outdated.
Fish
Sport fish by the share of the 35 government surveys that recorded them.
Forage fish and other species (7)
Forage fish
- Central Mudminnow 2
- Creek Chub 2
- Brook Stickleback 1
- Fathead Minnow 1
- Northern Redbelly Dace 1
Other
- White Sucker 14
- Brown Bullhead 3
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 8 species from Long Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Trout | 65-70 cm | 4 | 4 | PFAS |
| Northern Pike | 55-60 cm | 4 | 4 | PFAS |
| Smallmouth Bass | 35-40 cm | 4 | 4 | Arsenic, PFAS |
| Walleye | 40-45 cm | 2 | Do not eat | PFAS |
| Yellow Perch | 20-25 cm | 4 | 4 | PFAS |
| Brown Bullhead | 30-35 cm | 8 | 8 | PFAS |
| Cisco (Lake Herring) | 30-35 cm | Do not eat | Do not eat | PFAS |
| White Sucker | 40-45 cm | 2 | Do not eat | PFAS |
* As defined in the guide, including children and people who are or may become pregnant. Limits are for the length the guide lists most often; they change with the size of the fish. Read the official guide
Fishing regulations: Fisheries Management Zone 10. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 19 years between 1999 and 2025; the latest annual mean is 3.6 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.