Otty Lake
44.8414° N, 76.2269° W
Shoreline and neighbouring water from open government data.
Download the map (SVG)Otty Lake, Ontario. 44.8414° N, 76.2269° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/otty-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.
- Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.
Otty Lake covers 6.79 km², making it larger than 93% of the 18,731 lakes in Ontario. It lies beside Elmgrove.
Government surveys have recorded 6 fish species here, including bluegill, largemouth bass and pumpkinseed.
- Area
- 6.79 km²
- larger than 93% of the 18,731 lakes in Ontario
- Shoreline
- 37.8 km
- longer than 94% of the 18,731 lakes in Ontario
- Water clarity
- 4.8 mSecchi depth, 2025
- clearer than 77% of the 1,251 monitored lakes in Ontario
- Fish species
- 6
- more than 57% of the 2,454 surveyed lakes in Ontario
- Elevation
- 129 m
Today on the water
7.9 °C
Observed at Smiths Falls, as of 2:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.3 m.
| Time | 3 a.m. | 6 a.m. | 9 a.m. | 12 p.m. | 3 p.m. | 6 p.m. | 9 p.m. | 12 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | W 15 | W 15 | NW 30 | NW 30 | NW 15 | NW 10 | NW 10 |
| Gusts | 50 | 50 | ||||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.3 | ||||
| Temp. °C | 5 | 5 | 7 | 11 | 13 | 12 | 7 | 3 |
| Precip. % | 20 | 40 | 40 | 40 | 40 | 20 | 20 | 0 |
Tonight: Partly cloudy. 60 percent chance of showers this evening. Risk of a thunderstorm early this evening. Wind west 30 km/h gusting to 50 becoming light this evening. Low plus 4.
Weather: Smiths Falls (local forecast), as of 2:02 a.m. EDT
Sun and moon
- Civil dawn
- 6:43 a.m.
- Sunrise
- 7:12 a.m.
- Sunset
- 6:30 p.m.
- Civil dusk
- 6:59 p.m.
- Moonrise
- 6:04 a.m.
- Moonset
- 5:48 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
2 low risk
Kingston, as of 1:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Fish
Sport fish by the share of the 1 government surveys (2012–2012) that recorded them.
Forage fish and other species (2)
- Banded Killifish 1
- Bluntnose Minnow 1
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 5 species from Otty 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 | 12 | 4 | Mercury |
| Northern Pike | 55-60 cm | 4 | Do not eat | Mercury |
| Smallmouth Bass | 35-40 cm | 4 | Do not eat | Mercury |
| Walleye | 50-55 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 18. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 30 years between 1996 and 2025; the latest annual mean is 4.8 m.
Getting on the water
2 listed boat launches; 1 with parking listed. marks launches on the map.
East shore
- Otty Lake Boat Launch
South end
- Boat launch
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.