Sign inSign up free Sign inSign up free Sign inSign up freeShared by DepthScout anglers. Exact spots stay private, always.
73 km of the St. Marys River navigation corridor, with channel depths from USACE hydrographic survey. The river tops out around 98 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. Here's the year, species by species, as the scoring engine sees it.
Drawn out, this is 19,018 acres of water rimmed by 116.8 miles of bank. The 6 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. The shallow band under 15 ft claims about 11% of the surface — that's where the groceries are. The basin spans about 46.3 mi end to end and 11.3 mi across at its widest. For a second option, Lake George lies 14 mi northeast.
In spring, brook trout run shallow here, mostly 2 to 15 ft. Midsummer fish sit out in 10 to 30 ft before dropping to 3 to 20 ft for winter. Summer brook trout concentrate at Channel current seam (mile 17.4), a prime-rated current seam around 29 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a small spoon fished deep or a trolled lake-clear wobbler + worm most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Channel current seam (mile 2.5) (58 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Channel current seam (mile 17.4) (29 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Channel current seam (mile 2.5) (58 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Channel current seam (mile 32.4) (26 ft) | Small jigging spoon, Tungsten jig + plastic |
When the water first warms, steelhead slide up into 3 to 20 ft. Summer is a 5 to 45 ft game here, winter a 4 to 15 ft one. Start at Channel current seam (mile 17.4). It's a current seam holding about 29 ft of water and rates prime come summer. The feeding windows run early morning and the evening. Keep an orange dodger + fly high in the column or a thin spoon off boards rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 20 ft | dawn & dusk | Channel current seam (mile 32.4) (26 ft) | Small spoon or spinner at the mouths, Jig + waxworm under float |
| Summer | 5 to 45 ft | dawn & dusk | Channel current seam (mile 17.4) (29 ft) | Orange dodger + fly high in the column, Thin spoon off boards |
| Fall | 5 to 30 ft | dawn & dusk | Channel current seam (mile 17.4) (29 ft) | Spinner (silver/blue), Casting spoon |
| Winter | 4 to 15 ft | midday | Channel current seam (mile 2.5) (58 ft) | Float jig (black/purple), Bead rig |
Count 31 structure marks on this chart. The deepest, Slackwater eddy (mile 56.6), sits near 62 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 St. Marys River - Reach 1 of 2 specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
St. Marys River - Reach 1 of 2 is about 98 ft (30 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target brook trout, steelhead on St. Marys River - Reach 1 of 2. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Channel current seam (mile 17.4) is the top-rated area: a current seam in about 29 ft of water that rates prime for steelhead in summer. Scroll up to the map for the complete spot list by 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 St. Marys River - Reach 1 of 2 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.
Lake George 14 mi, ON · Twin Lakes 17 mi, ON · Desbarats Lake 18 mi, ON · Echo Bay 19 mi, ON · Little Lake George 19 mi, ON · Root River 19 mi, ON · Cloudy Lake 20 mi, ON · Diamond Lake 20 mi, ON · McCarrel Lake 20 mi, ON · Gibboney Lake 20 mi, ON · Boss Lake 20 mi, ON · Wigwas Lake 20 mi, ON
See how St. Marys River - Reach 1 of 2 stacks up: best steelhead lakes in Ontario · best brook trout lakes in Ontario
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.