Sheffield Long Lake
44.5953° N, 77.0097° W
Depth contours from the 1979 government survey. Not for navigation.
Download the depth map (SVG)Sheffield Long Lake, Ontario. 44.5953° N, 77.0097° W
Maximum depth 30 m (1979 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/sheffield-long-lake/, 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.
Sheffield Long Lake is 30 m deep at its deepest point, deeper than 78% of the 2,688 surveyed lakes in Ontario. It covers 0.93 km² and lies beside Gull Creek.
Government surveys have recorded 15 fish species here, including bluegill, black crappie and northern pike.
- Maximum depth
- 30 msurveyed 1979
- deeper than 78% of the 2,688 surveyed lakes in Ontario
- Area
- 0.93 km²
- larger than 66% of the 18,731 lakes in Ontario
- Shoreline
- 11.7 km
- longer than 77% of the 18,731 lakes in Ontario
- Water clarity
- 2.3 mSecchi depth, 2008
- less clear than 80% of the 1,251 monitored lakes in Ontario
- Fish species
- 15
- more than 89% of the 2,454 surveyed lakes in Ontario
- Elevation
- 186 m
Today on the water
2.5 °C
Observed at Kaladar, 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 | 4 | 7 | 11 | 13 | 12 | 6 | 2 | 0 |
| 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 14. UV index 4 or moderate.
Weather: Kaladar (local forecast), as of 5:02 a.m. EDT
Sun and moon
- Civil dawn
- 6:46 a.m.
- Sunrise
- 7:15 a.m.
- Sunset
- 6:33 p.m.
- Civil dusk
- 7:03 p.m.
- Moonrise
- 6:07 a.m.
- Moonset
- 5:52 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
2 low risk
Belleville, as of 4:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Depth
The government depth survey from 1979 records a maximum depth of 30 m, drawn from 3 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 12 government surveys (2010–2010) that recorded them.
Other species (6)
- Yellow Bullhead 5
- Brown Bullhead 4
- Shorthead Redhorse 2
- White Sucker 2
- Greater Redhorse 1
- Silver Redhorse 1
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 7 species from Sheffield Long Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Black Crappie | 20-25 cm | 12 | 8 | PFAS |
| Bluegill | 15-20 cm | 8 | 8 | PFAS |
| Largemouth Bass | 30-35 cm | 8 | 4 | PFAS |
| Northern Pike | 55-60 cm | 8 | 4 | PFAS |
| Smallmouth Bass | 35-40 cm | 4 | Do not eat | PFAS |
| Walleye | 40-45 cm | 8 | Do not eat | Mercury |
| Yellow Perch | 20-25 cm | 16 | 8 | Mercury |
* 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 18. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 4 years between 2005 and 2008; the latest annual mean is 2.3 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.