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19-acre lake in Frontenac County, Ontario. The lake tops out around 46 ft. The depth data here comes from the Ontario MNRF survey of 1981 (a transect sounding survey). What the data behind the map says about each species, season by season:
On the chart, Mousseau Lake draws 20 acres inside 0.9 miles of shoreline. Index 1.5 on the shoreline: a few honest points and pockets, nothing labyrinthine. The shallow band under 15 ft claims about 20% of the surface — that's where the groceries are. Tip to tip the water measures near 0.3 mi with a 0.2-mi widest point. You'll find it in Frontenac County. The nearest mapped water is McCreary Lake, 1 mi to the southwest.
Start shallow in spring: brook trout sit in 2 to 15 ft that time of year. Summer pushes them deeper, 10 to 30 ft, and winter fish settle into 3 to 20 ft. The spot to know is Shallow bay flat, a weed flat in about 5 ft of water that rates good for brook trout in spring. Warm-month bites cluster around early morning and the evening. Throw a small spoon fished deep or a trolled lake-clear wobbler + worm until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (5 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | open water | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (17 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shallow bay flat (5 ft) | Small jigging spoon, Tungsten jig + plastic |
Count 4 structure marks on this chart. The deepest, Deep basin, sits near 46 ft.
Season dates, license requirements, and size and bag limits for Ontario waters are set by the Ontario fishing regulations (FMZ summary) — and special regulations can apply to Mousseau Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Mousseau Lake is about 46 ft (14 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1981 (a transect sounding survey).
Anglers target brook trout on Mousseau Lake.
Shallow bay flat is the top-rated area: a weed flat in about 5 ft of water that rates good for brook trout in spring. Open the map above to see every rated spot for each species and season.
For brook trout, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Mousseau Lake is regulated by the Ontario fishing regulations (FMZ summary). Check the official Ontario regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
McCreary Lake 1 mi · Elbow Lake 3 mi · Wabun Lake 3 mi · Battery Lake 4 mi · Govan Lake 4 mi · Oriole Lake 4 mi · Limestone Lake 4 mi · Big Mair Lake 4 mi · Belanger Lake 4 mi · Little Black Lake 5 mi · Scully Lake 5 mi · Bailey Lake 5 mi
See how Mousseau Lake stacks up: best brook trout lakes in Ontario
More water nearby: Frontenac County fishing maps (127 charts). Browse all Ontario fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.