Lake Rosseau

Lake facts

• Surface area

  63.9 km²

  Public record · Ontario MNR Aquatic Resource Area (ARA) Water Poly Segment, Land Information Ontario open data (data used by Fish ON-Line) · checked November 5 2026

• Deepest point

  89.0 m

  Public record · Ontario MNR Aquatic Resource Area (ARA) Water Poly Segment, Land Information Ontario open data (data used by Fish ON-Line) · checked November 5 2026

• Boating rules

  Schedule 5: 9 km/h within 30 m of shore, a dock, pier, raft, floating platform or another vessel (not for a water ski or kite take-off straight out from shore). On the Joseph River between Lake Joseph and Lake Rosseau (Ames Point to Joseph River Shoal): 9 km/h within 30 m (Schedule 5), no towing of a person on skis, tubes or other gear (Schedule 6) and no wake surfing (Schedule 7); the schedules list no permitted hours for this river. On this lake the 9 km/h limit replaces the general 10 km/h within 30 m of shore rule (Vessel Operation Restriction Regulations, s. 2(7) and 2(8)). No other lake-wide limit found in the schedules.

  Public record · Transport Canada, Schedules of the Vessel Operation Restriction Regulations (TP 15587), 2nd edition April 2026 · checked November 5 2026

• Fish in the lake

  Walleye, Northern Pike, Muskellunge, Smallmouth Bass, Largemouth Bass, Lake Trout, Lake Whitefish, Cisco, Yellow Perch, Black Crappie, Pumpkinseed, Rock Bass, Burbot, Brown Bullhead. These game and pan fish are recorded in MNR lake data; not all are common today.

  Public record · Ontario MNR Aquatic Resource Area (ARA) Water Poly Segment, Land Information Ontario open data (data used by Fish ON-Line) · checked November 5 2026

• Fishing zone

  Zone 15

  Public record · Fisheries Management Zone 15, Ontario Fishing Regulations Summary, ontario.ca · checked November 5 2026

• Water clarity

  Lake Partner Program volunteer data: 2025 average water clarity (Secchi depth) 4.0 m from 1 readings; 2025 average total phosphorus 6.3 micrograms per litre from 1 samples. One sample site only.

  Public record · Ontario Lake Partner Program open data, Secchi depth and total phosphorus files (2025 release), data.ontario.ca/dataset/ontario-lake-partner · checked November 5 2026

• Boat launches

  Provincial data lists 13 boat launch or access points on or beside the lake (12 marked municipal, provincial or federal; others private or not stated). Named public sites include Rosseau, Windermere Park, Maple Leaf Bay, Brackenrig, Adams Bay, Skeleton Bay, Portage Bay, Gull Rock. Check ownership, fees and parking locally.

  Public record · Ontario MNR Fishing Access Point layer, Land Information Ontario open data (points within 400 m of the lake outline) · checked November 5 2026

General information only. Lake rules and conditions change: check the official source before you swim, boat or fish.