Mercer Lake
46.1637° N, 80.2479° W
Depth contours from the 1980 government survey. Not for navigation.
Download the depth map (SVG)Mercer Lake, Ontario. 46.1637° N, 80.2479° W
Maximum depth 18 m (1980 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/mercer-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.
- 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.
- 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).
- Guide to Eating Ontario Fish: Advisory Database, Ontario Ministry of the Environment, Conservation and Parks. Contains information licensed under the Open Government Licence – Ontario.
Mercer Lake is 18 m deep at its deepest point, deeper than 52% of the 2,688 surveyed lakes in Ontario. It covers 0.66 km² and lies 1.6 km east of North Monetville.
Government surveys have recorded 12 fish species here, including northern pike, rock bass and yellow perch.
- Maximum depth
- 18 msurveyed 1980
- deeper than 52% of the 2,688 surveyed lakes in Ontario
- Area
- 0.66 km²
- larger than 57% of the 18,731 lakes in Ontario
- Shoreline
- 10.7 km
- longer than 75% of the 18,731 lakes in Ontario
- Water clarity
- 2 mSecchi depth, 2012
- less clear than 86% of the 1,251 monitored lakes in Ontario
- Fish species
- 12
- more than 81% of the 2,454 surveyed lakes in Ontario
- Elevation
- 200 m
Today on the water
4 °C
Observed at West Nipissing, as of 4:00 a.m. EDT
calm Estimated waves, next 12 hours: up to 0.1 m. Around 5 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| 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 | W 10 | NW 20 | NW 20 | NW 20 | NW 10 | var. 5 | SE 10 | SE 10 |
| Gusts km/h | 40 | |||||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.1 | ||||
| Temp. °C | 4 | 4 | 8 | 13 | 14 | 9 | 5 | 3 |
| Precip. % | 30 | 30 | 20 | 20 | 20 | 0 | 0 | 0 |
Tonight: Mainly cloudy with 30 percent chance of showers. Wind southwest 20 km/h becoming light early this evening. Low plus 4.
Weather: West Nipissing (local forecast), as of 4:00 a.m. EDT
Sun and moon
- Civil dawn
- 7:00 a.m.
- Sunrise
- 7:30 a.m.
- Sunset
- 6:45 p.m.
- Civil dusk
- 7:15 p.m.
- Moonrise
- 6:22 a.m.
- Moonset
- 6:04 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
10% of Mercer Lake 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 from 1980 records a maximum depth of 18 m, drawn from 15 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 10 government surveys (2009–2014) that recorded them.
Forage fish and other species (5)
Forage fish
- Blackchin Shiner 1
- Bluntnose Minnow 1
- Golden Shiner 1
Other
- Brown Bullhead 5
- White Sucker 5
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 5 species from Mercer Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Largemouth Bass | 35-40 cm | 8 | Do not eat | Mercury |
| Northern Pike | 55-60 cm | 8 | 4 | Mercury |
| Smallmouth Bass | 40-45 cm | 4 | Do not eat | Mercury |
| Walleye | 40-45 cm | 4 | Do not eat | Mercury |
| White Sucker | 40-45 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 11. Check seasons and limits before you fish.
Water
Getting on the water
1 listed boat launch. marks launches on the map.
- Boat launch
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.