Olsen Lake

Lake Northern Ontario FMZ 5 Crown Land (Free)

6 m

Deepest charted contour

About this spot

Olsen Lake is a lake in the Northern Ontario area of Ontario, in Fisheries Management Zone 5. An MNR depth chart exists for this lake; its deepest charted contour is 6 m. This waterbody sits on Ontario Crown land open to anglers holding a valid Ontario fishing licence.

Location

Fish Species

No species reported for this spot yet.

Lake data from Ontario government surveys

Depth chart

MNR depth chart on file
Deepest charted contour: 6 m
The deepest contour line on the chart. The true maximum depth is at least this deep.

Sources: Land Information Ontario — Aquatic Resource Area survey points, Bathymetry Index and Bathymetry Line, Fisheries Management Zones, Fishing Access Points. Contains information licensed under the Open Government Licence – Ontario.

Fisheries Management Zone 5

Olsen Lake is in Fisheries Management Zone 5. Open seasons, catch limits and size limits in Ontario are set zone by zone, and some lakes carry their own exceptions, so check the FMZ 5 rules before you fish.

FMZ 5 regulations on ontario.ca

Ice fishing on Olsen Lake (2026–27)

Ontario has no separate ice fishing season: the regular open seasons apply through the ice. Olsen Lake is in Fisheries Management Zone 5, where 11 of 14 species groups are open for the whole ice season (December 1 to March 31) under the zone-wide rules.

Species	Through the ice	Zone-wide season	Limits
Brook trout	Open	open all year	S-5 and C-2
Brown trout	Open	open all year	S-5 and C-2
Crappie	Different rule here See the rules for this lake below	open all year	S-10 and C-5
Lake sturgeon	Closed	closed all year
Lake trout	Part of the season Jan 1 – Mar 31	January 1 to September 30	Ontario and Canadian residents (+4)
Lake whitefish	Open	open all year	S-12 and C-6
Largemouth and smallmouth bass combined	Different rule here See the rules for this lake below	open all year	S-4 and C-2; must be less than 35 centimetres from January 1 to June 30
Muskellunge	Different rule here See the rules for this lake below	third Saturday in June to December 15	S-1; must be greater than 102 centimetres and C-0
Northern pike	Open	open all year	S-4 and C-2; none greater than 75 centimetres
Rainbow trout	Open	open all year	S-5 and C-2
Splake	Open	open all year	S-5 and C-2
Sunfish	Open	open all year	S-50 and C-25
Walleye and sauger combined	Different rule here See the rules for this lake below	January 1 to April 14 and third Saturday in May to December 31	Ontario and Canadian residents (+4)
Yellow perch	Open	open all year	S-50 and C-25

S = sport fishing licence, C = conservation licence (daily catch and possession). Dates are worked out for 2026–27 from the wording of the 2026 summary. Ontario publishes a new summary every January 1, so check the 2027 edition for dates after December 31.

Rules specific to Olsen Lake

The 2026 summary lists this lake by name and location. These rules replace the zone-wide ones above where they overlap.

Waterbody exception: Crappie - S-15 and C-10; Largemouth and smallmouth bass combined - S-2 and C-1; must be less than 35 centimetres from January 1 to June 30 and December 1 to December 31, S-4 and C-2; no size limit from July 1 to November 30; Muskellunge - S-1; must be greater than 137 centimetres, and C-0; Walleye and sauger combined: Ontario and Canadian residents: S-4 and C-2; none between 46-58 centimetres, not more than 1 greater than 58 centimetres; Walleye and sauger combined: Non-Canadian residents: Daily catch and retain limit: S-2 and C-2; none between 46-58 centimetres, not more than 1 greater than 58 centimetres; Walleye and sauger combined: Non-Canadian residents: Possession limit: S-4 and C-2; none between 46-58 centimetres, not more than 1 greater than 58 centimetres

Ice huts in Zone 5

No hut registration is required in this zone. There is no fixed removal date, but every hut must be off before the ice breaks up. You may fish with two lines through the ice in most waters, within 60 m and in sight of each.

Zone 5 ice fishing rules Ice fishing in Ontario guide

Source: Ontario Fishing Regulations Summary 2026, Zone 5 (ontario.ca); ice hut rules: ontario.ca/page/ice-fishing. This summary is not the law: check the regulations and local conditions, and never go on ice you have not tested.