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2,934-acre lake in Cochrane District, Ontario. The lake tops out around 12 ft. The depth chart comes from Ontario Ministry of Natural Resources and Forestry bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The depth data here comes from the Ontario MNRF survey of 1964, a decades-old survey (an MNRF lake survey). Every species below gets its seasonal read from the same numbers driving the chart.
On the chart, Shannon Lake draws 2,930 acres inside 9.1 miles of shoreline. Its 1.2 shoreline index means few bank features; the contours below do the pattern work. Nothing on this chart breaks 15 ft, which makes the whole surface littoral: weeds, bait and ambush cover everywhere. Call it 3 mi long by 2.2 mi wide at the broadest reach. The water lies in Cochrane District. For a second option, East Mattawishkwia Lake lies 4 mi southwest.
Early season walleye use the shallows, holding in 3 to 12 ft. Even in summer they hold at 4 to 12 ft; winter keeps them in 4 to 12 ft. The chart's best answer is Sharp break — drop-off, 4 ft, prime for fall. Best bite is the evening and early morning. Tie on a crawler harness on bottom bouncer or a deep crankbait (trolled) and you're in the game.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft chart-limited; documented 4 to 15 ft | dusk & dawn | Gravel shoal (1 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 4 to 12 ft chart-limited; documented 15 to 35 ft | dusk & dawn | Sharp break (4 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 4 to 12 ft chart-limited; documented 12 to 40 ft | dusk & night | Sharp break (4 ft) | Jigging rap, Jig + big minnow |
| Winter | 4 to 12 ft chart-limited; documented 20 to 40 ft | dusk & dawn | Deep basin (10 ft) | Jigging spoon + minnow head, Rattle bait |
Spring yellow perch on Shannon Lake hold shallow, usually 3 to 12 ft. Depth-wise the year is flat: 4 to 12 ft in summer, 4 to 12 ft once it turns cold. The chart's best answer is Weed flat — weed flat, 3 ft, prime for spring. Prime time lands in early morning. The summer box starts with a drop-shot micro plastics or a small spoon tipped with worm.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Weed flat (3 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 4 to 12 ft chart-limited; documented 10 to 30 ft | dawn | Deep basin (10 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 4 to 12 ft chart-limited; documented 12 to 35 ft | midday | Deep basin (10 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 4 to 12 ft chart-limited; documented 15 to 35 ft | midday & dawn | Deep basin (10 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. As the season builds they drop to 4 to 12 ft, wintering in 4 to 12 ft. Spring northern pike concentrate at Shallow bay flat, a prime-rated weed flat around 2 ft. Warm-month bites cluster around early morning and the evening. A bucktail or a weedless spoon over cabbage covers the summer program.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (2 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 4 to 12 ft chart-limited; documented 8 to 20 ft | dawn & dusk | Sharp break (4 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 4 to 12 ft chart-limited; documented 6 to 18 ft | midday & dawn | Sharp break (4 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 4 to 12 ft chart-limited; documented 5 to 15 ft | midday | Weed flat (3 ft) | Tip-ups, Large jigging spoon |
Shannon Lake carries 12 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 10 ft down.
Access data: Geospatial Ontario - Fishing Access Points; Government of Ontario - MNR Unpatented Crown Land Shoreline; Government of Ontario - MNR Unpatented Crown Land Shoreline. Confirm conditions and fees locally before you launch.
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 Shannon Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Shannon Lake is about 12 ft (4 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1964, a decades-old survey (an MNRF lake survey).
Anglers target walleye, yellow perch, northern pike on Shannon Lake.
Sharp break is the top-rated area: a drop-off in about 4 ft of water that rates prime for walleye in fall. The interactive chart above rates every spot for each species and season.
For walleye, the summer bite is best in the evening and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Shannon 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.
East Mattawishkwia Lake 4 mi · Mattawishkwia Lake 5 mi · Clear Lake 8 mi · Ritchie Lake 8 mi · Mulvey Lake 9 mi · Joe's Lake 10 mi · Lac Pivabiska 14 mi · Johnson's Lake 14 mi · Wolverine Lake 17 mi · Sweet Lake 17 mi · Wanzatika Lake 18 mi · Hanlan Lake 19 mi
See how Shannon Lake stacks up: best walleye lakes in Ontario · best northern pike lakes in Ontario · best yellow perch lakes in Ontario
More water nearby: Cochrane District fishing maps (673 charts). Browse all Ontario fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. 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.