Nepahwin Lake
46.4624° N, 80.9835° W
Depth contours from the government survey. Not for navigation.
Download the depth map (SVG)Nepahwin Lake, Ontario. 46.4624° N, 80.9835° W
Maximum depth 22 m. Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/nepahwin-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.
- Fish stocking for recreational purposes, 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.
- Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.
Nepahwin Lake is 22 m deep at its deepest point, deeper than 66% of the 2,688 surveyed lakes in Ontario. It covers 1.29 km² and lies beside Lo-Ellen.
Government surveys have recorded 1 fish species here: splake.
- Maximum depth
- 22 m
- deeper than 66% of the 2,688 surveyed lakes in Ontario
- Area
- 1.29 km²
- larger than 73% of the 18,731 lakes in Ontario
- Shoreline
- 9.6 km
- longer than 73% of the 18,731 lakes in Ontario
- Water clarity
- 3.1 mSecchi depth, 2025
- less clear than 59% of the 1,251 monitored lakes in Ontario
- Fish species
- 1
- fewer than 100% of the 2,454 surveyed lakes in Ontario
- Elevation
- 258 m
Today on the water
3.6 °C
Observed at Greater Sudbury, as of 3:00 a.m. EDT
calm Estimated waves, next 12 hours: up to 0.1 m. Around 4 a.m., wind from the west: the west shore is sheltered, waves build toward the east 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 | 0.1 | 0.1 | 0.1 | |||
| 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
- 6:06 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
11% of Nepahwin Lake is shallower than 3 m, and 53% is deeper than 10 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 22 m, drawn from 110 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
- SplakeStocked
Stocking
Splake14,200 fish in 5 years, most recently 2021
All stocking records (5)
| Year | Species | Fish | Stage |
|---|---|---|---|
| 2021 | Splake | 4,000 | Yearlings |
| 2020 | Splake | 2,000 | Yearlings |
| 2019 | Splake | 3,000 | Yearlings |
| 2018 | Splake | 2,200 | Yearlings |
| 2017 | Splake | 3,000 | Yearlings |
Eating your catch
The provincial guide to eating fish (2026) sets limits for 10 species from Nepahwin Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Trout | 60-65 cm | Do not eat | Do not eat | PCB |
| Northern Pike | 55-60 cm | 1 | Do not eat | PFAS |
| Rock Bass | 15-20 cm | 1 | Do not eat | PFAS |
| Smallmouth Bass | 35-40 cm | Do not eat | Do not eat | PFAS |
| Splake | 45-50 cm | Do not eat | Do not eat | PCB |
| Walleye | 65-70 cm | Do not eat | Do not eat | PCB |
| Yellow Perch | 20-25 cm | 4 | 4 | PFAS |
| Brown Bullhead | 25-30 cm | 4 | 4 | PCB |
| Rainbow Smelt | 15-20 cm | 1 | Do not eat | PCB, PFAS |
| White Sucker | 45-50 cm | 1 | Do not eat | PCB |
* 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 9 years between 2003 and 2025; the latest annual mean is 3.1 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.