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23 km of the Patapsco River navigation corridor, with channel depths from USACE hydrographic survey. The river tops out around 65 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 is how the season plays out for each species, straight from the data behind the map.
The drawn water covers 2,675 acres wrapped in 34.2 miles of bank. That shoreline is heavily fingered (development index 4.7) — bays, points and pockets everywhere, which multiplies the fishable edge. 14% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. The basin spans about 16.5 mi end to end and 1.9 mi across at its widest. If the bite dies, Loch Raven Reservoir is 19 mi to the north.
In spring, brown trout run shallow here, mostly 3 to 25 ft. Summer pushes them deeper, 25 to 60 ft, and winter fish settle into 5 to 35 ft. Current seam (mile 0.6) is the standout, a current seam at roughly 36 ft, rated prime for summer brown trout. Time it for after dark and early morning. You won't need more than a spoon at the thermocline or a deep stickbait (night) most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 25 ft | dawn & dusk | Slackwater eddy (mile 11.9) (25 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 25 to 60 ft | night & dawn | Current seam (mile 0.6) (36 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 5 to 30 ft | dusk & dawn | Slackwater eddy (mile 11.9) (25 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 5 to 35 ft | dawn | Slackwater eddy (mile 11.9) (25 ft) | Jigging spoon, Small stickbait (slow) |
Spring rainbow trout on Patapsco River hold shallow, usually 5 to 20 ft. They move out to 8 to 30 ft in summer and finish the year down in 8 to 40 ft. Put Current seam (mile 0.6) first on the milk run — a current seam near 36 ft that grades prime for winter. The feeding windows run early morning and the evening. The summer box starts with a dodger + spoon (deep troll) or a flutter spoon.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Channel bar / point (mile 13.7) (24 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Main-channel hole (mile 15.6) (20 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Current seam (mile 0.6) (36 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Current seam (mile 0.6) (36 ft) | Jigging spoon, Tube jig (white) |
Early season brook trout use the shallows, holding in 2 to 15 ft. Summer is a 10 to 30 ft game here, winter a 3 to 20 ft one. The chart's best answer is Slackwater eddy (mile 11.9) — eddy pocket, 25 ft, prime for summer. Best bite is early morning and the evening. Tie on a small spoon fished deep or a trolled lake-clear wobbler + worm and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Current seam (mile 0.6) (36 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Slackwater eddy (mile 11.9) (25 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Current seam (mile 0.6) (36 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Slackwater eddy (mile 11.9) (25 ft) | Small jigging spoon, Tungsten jig + plastic |
Count 9 structure marks on this chart. The deepest, Slackwater eddy (mile 4.4), sits near 51 ft.
Season dates, license requirements, and size and bag limits for Maryland waters are set by the Maryland DNR — and special regulations can apply to Patapsco River specifically, so confirm the current rules before you fish.
Check the official Maryland fishing regulations →
Patapsco River is about 65 ft (20 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 brown trout, rainbow trout, brook trout on Patapsco River. 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.
Current seam (mile 0.6) is the top-rated area: a current seam in about 36 ft of water that rates prime for rainbow trout in winter. The interactive chart above rates every spot for each species and season.
For brown trout, the summer bite is best in after dark 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 Patapsco River is regulated by the Maryland DNR. Check the official Maryland regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Loch Raven Reservoir 19 mi · T. Howard Duckett Reservoir 25 mi · Gunpowder Falls 27 mi · Liberty Reservoir 29 mi · Piney Run Lake 31 mi · Prettyboy Reservoir 35 mi · Bohemia River 35 mi, DE · Clopper Lake 43 mi · Masseys Mill Pond 45 mi, DE · Little Seneca Lake 45 mi · Lake Como 46 mi, DE · Garrisons Lake 46 mi, DE
See how Patapsco River stacks up: best rainbow trout lakes in Maryland
Browse all Maryland 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.