Mississippi Lake (Ontario): Depth Map, Fishing & Boat Launches

Map of Mississippi Lake with depth contours — Mississippi Lake
45.0654° N, 76.1853° W

Depth contours from the 1969 government survey. Not for navigation.

Mississippi Lake, Ontario. 45.0654° N, 76.1853° W

Maximum depth 9.1 m (1969 survey). Scale bar on the map.

Not for navigation. Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/mississippi-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.

Mississippi Lake is 9.1 m deep at its deepest point, shallower than 76% of the 2,688 surveyed lakes in Ontario. It covers 24.4 km² and lies 1.9 km south of Carleton Place.

Government surveys have recorded 14 fish species here, including yellow perch, smallmouth bass and rock bass.

Maximum depth: 9.1 msurveyed 1969; shallower than 76% of the 2,688 surveyed lakes in Ontario
Area: 24.4 km²; larger than 98% of the 18,731 lakes in Ontario
Shoreline: 58.4 km; longer than 96% of the 18,731 lakes in Ontario
Water clarity: 3.4 mSecchi depth, 2018; less clear than 53% of the 1,251 monitored lakes in Ontario
Fish species: 14; more than 86% of the 2,454 surveyed lakes in Ontario
Elevation: 131 m

Today on the water

10.6 °C

Wind NW 11 km/h

Observed at Smiths Falls, as of 10:00 a.m. EDT

choppy Estimated waves, next 12 hours: up to 0.4 m. Around 12 p.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast shore.

Hourly forecast, next 24 hours
Time	11 a.m.	2 p.m.	5 p.m.	8 p.m.	11 p.m.	2 a.m.	5 a.m.	8 a.m.
Wind km/h	W 15	NW 30	NW 30	NW 15	NW 10	var. 5	var. 5	var. 5
Gusts km/h		50	50
Waves (est.) m	0.2	0.4	0.4	0.2
Temp. °C	10	13	14	8	4	2	1	2
Precip. %	40	40	40	20	20	0	0	0

Today: A mix of sun and cloud with 40 percent chance of showers. Wind becoming northwest 30 km/h gusting to 50 near noon. High 14. UV index 3 or moderate.

Weather: Smiths Falls (local forecast), as of 10:02 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

1 low risk

Ottawa, as of 9:00 a.m. EDT

Depth

59% of Mississippi Lake is shallower than 3 m, and 24% is deeper than 5 m.

0 m3 m6 m9 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 1969 records a maximum depth of 9.1 m, drawn from 46 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 29 government surveys (2009–2019) that recorded them.

Yellow Perch23 of 29
Smallmouth Bass14 of 29
Rock Bass10 of 29
Walleye9 of 29
Northern Pike8 of 29
Pumpkinseed8 of 29
Bluegill5 of 29
Black Crappie2 of 29
Largemouth Bass2 of 29

Forage fish and other species (5)

Forage fish

Logperch 7
Blackchin Shiner 3
Trout-Perch 2

Other

White Sucker 7
Brown Bullhead 4

Numbers are the surveys that recorded each species.

Eating your catch

The provincial guide to eating fish (2026) sets limits for 11 species from Mississippi Lake. Maximum meals per month:

Species	Length	General population	Sensitive population*	Contaminant
Black Crappie	20-25 cm	16	8	Mercury
Bluegill	15-20 cm	32	16	–
Largemouth Bass	30-35 cm	8	4	Mercury
Northern Pike	55-60 cm	8	Do not eat	Mercury
Pumpkinseed	15-20 cm	32	16	–
Rock Bass	15-20 cm	16	8	Mercury
Smallmouth Bass	35-40 cm	8	4	Mercury
Walleye	40-45 cm	12	4	Mercury
Yellow Perch	20-25 cm	16	8	Mercury
Brown Bullhead	25-30 cm	32	16	–
White Sucker	40-45 cm	16	12	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.