Oastler Lake
45.3173° N, 79.9667° W
Depth contours from the 1970 government survey. Not for navigation.
Download the depth map (SVG)Oastler Lake, Ontario. 45.3173° N, 79.9667° W
Maximum depth 18.3 m (1970 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/oastler-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.
- 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).
- 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.
Oastler Lake is 18.3 m deep at its deepest point, deeper than 54% of the 2,688 surveyed lakes in Ontario. It covers 1.19 km² and lies 2.7 km south of Haines Lake.
Government surveys have recorded 3 fish species here: pumpkinseed, splake and central mudminnow.
- Maximum depth
- 18.3 msurveyed 1970
- deeper than 54% of the 2,688 surveyed lakes in Ontario
- Area
- 1.19 km²
- larger than 71% of the 18,731 lakes in Ontario
- Shoreline
- 10.3 km
- longer than 74% of the 18,731 lakes in Ontario
- Water clarity
- 3.1 mSecchi depth, 2023
- less clear than 60% of the 1,251 monitored lakes in Ontario
- Fish species
- 3
- fewer than 55% of the 2,454 surveyed lakes in Ontario
- Elevation
- 204 m
Today on the water
9.8 °C
Observed at Parry Sound, as of 3:00 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 | 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 15 | W 15 | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 |
| Gusts km/h | 50 | 50 | ||||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.2 | ||||
| Temp. °C | 5 | 6 | 9 | 12 | 14 | 11 | 6 | 4 |
| Precip. % | 40 | 40 | 40 | 40 | 20 | 20 | 0 | 0 |
Tonight: Partly cloudy with 60 percent chance of showers. Risk of a thunderstorm early this evening. Wind west 30 km/h gusting to 50 becoming light this evening. Low plus 5.
Weather: Parry Sound (local forecast), as of 3:00 a.m. EDT
Sun and moon
- Civil dawn
- 6:58 a.m.
- Sunrise
- 7:28 a.m.
- Sunset
- 6:45 p.m.
- Civil dusk
- 7:14 p.m.
- Moonrise
- 6:20 a.m.
- Moonset
- 6:03 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
2 low risk
Parry Sound, as of 2:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Depth
The government depth survey from 1970 records a maximum depth of 18.3 m, drawn from 14 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 1 government surveys (2005–2005) that recorded them.
Forage fish and other species (1)
- Central Mudminnow 1
Numbers are the surveys that recorded each species.
Stocking
Splake10,460 fish in 4 years, most recently 2022
All stocking records (4)
| Year | Species | Fish | Stage |
|---|---|---|---|
| 2022 | Splake | 3,400 | Yearlings |
| 2020 | Splake | 4,200 | Yearlings |
| 2019 | Splake | 1,000 | Yearlings |
| 2017 | Splake | 1,860 | Yearlings |
Eating your catch
The provincial guide to eating fish (2026) sets limits for 2 species from Oastler Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Smallmouth Bass | 35-40 cm | 12 | 4 | Mercury |
| White Sucker | 40-45 cm | 16 | 16 | 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 15. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 22 years between 1999 and 2023; the latest annual mean is 3.1 m.
Getting on the water
2 listed boat launches; 2 with parking listed. marks launches on the map.
East shore
- Boat launch
South shore
- Oastler Lake Provincial Park
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.