Riley Lake
44.8371° N, 79.1818° W
Depth contours from the 1975 government survey. Not for navigation.
Download the depth map (SVG)Riley Lake, Ontario. 44.8371° N, 79.1818° W
Maximum depth 15.2 m (1975 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/riley-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).
- 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.
Riley Lake is 15.2 m deep at its deepest point, shallower than 55% of the 2,688 surveyed lakes in Ontario. It covers 1.56 km² and lies 3.1 km southeast of Houseys Rapids.
Government surveys have recorded 8 fish species here, including black crappie, largemouth bass and northern pike.
- Maximum depth
- 15.2 msurveyed 1975
- shallower than 55% of the 2,688 surveyed lakes in Ontario
- Area
- 1.56 km²
- larger than 76% of the 18,731 lakes in Ontario
- Shoreline
- 22 km
- longer than 89% of the 18,731 lakes in Ontario
- Water clarity
- 2.1 mSecchi depth, 2025
- less clear than 82% of the 1,251 monitored lakes in Ontario
- Fish species
- 8
- more than 65% of the 2,454 surveyed lakes in Ontario
- Elevation
- 249 m
Today on the water
8.2 °C
Observed at Muskoka, 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 | 4 | 5 | 8 | 12 | 14 | 11 | 6 | 3 |
| 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 northwest 30 km/h gusting to 50 becoming light this evening. Low plus 4.
Weather: Muskoka (local forecast), as of 3:02 a.m. EDT
Sun and moon
- Civil dawn
- 6:55 a.m.
- Sunrise
- 7:24 a.m.
- Sunset
- 6:42 p.m.
- Civil dusk
- 7:11 p.m.
- Moonrise
- 6:16 a.m.
- Moonset
- 6:00 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
2 low risk
Dorset, as of 2:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Depth
44% of Riley Lake is shallower than 3 m, and 40% is deeper than 5 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 1975 records a maximum depth of 15.2 m, drawn from 27 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 (2012–2012) that recorded them.
Other species (1)
- Brown Bullhead 1
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 4 species from Riley Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Black Crappie | 20-25 cm | 16 | 8 | Mercury |
| Largemouth Bass | 30-35 cm | 8 | Do not eat | Mercury |
| Northern Pike | 55-60 cm | 8 | 4 | Mercury |
| Smallmouth Bass | 35-40 cm | 4 | Do not eat | 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 15. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 17 years between 2003 and 2025; the latest annual mean is 2.1 m.
Getting on the water
1 listed boat launch; 1 with parking listed. marks launches on the map.
- Boat launch
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.