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Rating depth structure for largemouth bass.
Shared by DepthScout anglers. Exact spots stay private, always.
123-acre lake in Muskoka District Municipality, Ontario. The lake tops out around 53 ft. The depth picture is modeled, anchored to the true shoreline and the water's published max depth — a scouting aid, never a chart to run a boat by. Every species below gets its seasonal read from the same numbers driving the chart.
Drawn out, this is 124 acres of water rimmed by 4.2 miles of bank. A development index of 2.7 means a maze of bays and points: far more casting targets than a round bowl of the same size. The shallow band under 15 ft claims about 54% of the surface on the model — that's where the groceries are. Figure 1.1 mi of water from one end to the other, 0.5 mi at the beam. You'll find it in Muskoka District Municipality. For a second option, Pence Lake lies 1 mi northeast.
The spring pattern is a shallow one: largemouth bass in 2 to 10 ft. Midsummer fish sit out in 8 to 20 ft before dropping to 15 to 35 ft for winter. The spot to know is Shallow bay flat, a weed flat in about 6 ft of water that rates prime for largemouth bass in spring. Plan around early morning and the evening in the warm months. Summer baits: a texas-rigged 10" worm or a deep-diving crankbait gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (6 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Main-lake point (13 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (13 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 15 to 35 ft | midday | Break off the point (24 ft) | Blade bait, Jigging spoon |
6 pieces of structure are mapped here — Deep basin, around 45 ft, is the deepest of them.
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 Rat Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Rat Lake is about 53 ft (16 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target largemouth bass on Rat Lake.
Shallow bay flat is the top-rated area: a weed flat in about 6 ft of water that rates prime for largemouth bass in spring. Scroll up to the map for the complete spot list by species and season.
For largemouth bass, 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 Rat 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.
Pence Lake 1 mi · Upper Boleau Lake 2 mi · Woodland Lake 3 mi · Little Lake 3 mi · Lower Boleau Lake 3 mi · Morrison Lake 3 mi · Lamorie Lake 4 mi · Dumbell Lake 4 mi · Hart Lake 4 mi · Shaw Lake 4 mi · Bearpaw Lake 4 mi · Muldrew Lakes 4 mi
See how Rat Lake stacks up: best largemouth bass lakes in Ontario
More water nearby: Muskoka District Municipality fishing maps (276 charts). Browse all Ontario fishing maps or see every water on DepthScout. 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.