Monocacy River Fishing Map & Spots (MD)

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River depth chart

Monocacy River, MD

Max 12 ft

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Where to start

White mayfly (Ephoron) window is on — see the hatch outlook

Hatch outlook

White mayfly (Ephoron)Active window

Typical here: Jul 10 – Sep 10 · the famous late-summer smallmouth surface event — dusk to dark, ~7:30–9:30pm; starts on the lower Susquehanna below Wrightsville and spreads upriver; fish gorge so hard early that they can be stuffed before the hatch ends

dundusk — the whole life cycle plays out in one evening — females mate, fly miles upstream and fall spent within a couple of hours; when the blizzard is too thick, your fly disappears in the crowd — fish the edges of the swarm
spinnerfull dark, same night

Smallmouth set up in feeding lanes like trout and will not move far — accuracy beats distance.

The best conventional surface window of late summer on smallmouth rivers: small white or bone surface plugs and propbaits in the last hour of light, white inline spinners run upstream through the feeding lanes, or a bubble with a White Wulff.

The event happens over sand- and silt-bottom runs with moderate current, feeding lanes below riffles

Recommendations come from depth structure and seasonal species behavior. Treat them as a starting point, not a guarantee. Contours on this water are approximations. Never use for navigation. Always check local regulations.

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Recent catches at Monocacy River

Shared by DepthScout anglers. Exact spots stay private, always.

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Fishing Monocacy River: what the data says

Frederick County's smallmouth river. 58 miles from the Pennsylvania line to the Potomac, with wadeable riffle-and-run water and deeper bass-and-catfish pools. The river tops out around 12 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. The season-by-season read for each species follows, from the map's own numbers.

The outline encloses 3,143 acres, worked by 112.2 miles of shoreline. An index of 14.3 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. There is no deep basin to speak of — the entire surface is under ~15 ft, prime weed water end to end. Tip to tip the water measures near 35.7 mi with a 5.2-mi widest point. It sits in Frederick County. Its nearest charted neighbour, Greenbrier Lake, is 16 mi to the west.

Smallmouth Bass fishing at Monocacy River

Spring smallmouth bass on Monocacy River 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. Put Current seam (mile 17.4) first on the milk run — a current seam near 7 ft that grades prime for spring. The feeding windows run early morning and the evening. The summer box starts with a drop shot (goby/minnow) or a ned rig.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	dawn & dusk	Current seam (mile 17.4) (7 ft)	Ned rig, Tube jig
Summer	4 to 12 ft	dawn & dusk	Current seam (mile 17.4) (7 ft)	Drop shot (goby/minnow), Ned rig
Fall	4 to 12 ft	midday & dawn	Current seam (mile 17.4) (7 ft)	Jerkbait, Blade bait
Winter	4 to 12 ft	midday	Current seam (mile 17.4) (7 ft)	Blade bait, Hair jig

Largemouth Bass fishing at Monocacy River

Early season largemouth bass use the shallows, holding in 2 to 10 ft. Summer is a 4 to 12 ft game here, winter a 4 to 12 ft one. The chart's best answer is Outside-bend hole (mile 0.6) — creek channel, 9 ft, prime for fall. Best bite is early morning and the evening. Tie on a texas-rigged 10" worm or a deep-diving crankbait and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 10 ft	dawn & dusk	open water	Spinnerbait, Chatterbait
Summer	4 to 12 ft	dawn & dusk	Current seam (mile 17.4) (7 ft)	Texas-rigged 10" worm, Deep-diving crankbait
Fall	3 to 12 ft	midday & dawn	Outside-bend hole (mile 0.6) (9 ft)	Squarebill crankbait (shad), Spinnerbait
Winter	4 to 12 ft	midday	Outside-bend hole (mile 0.6) (9 ft)	Blade bait, Jigging spoon

Channel Catfish fishing at Monocacy River

Early season channel catfish 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 Outside-bend hole (mile 0.6) — creek channel, 9 ft, prime for summer. Best bite is after dark and the evening.

Season	Depth	Best window	Start at
Spring	3 to 12 ft	dusk	Outside-bend hole (mile 0.6) (9 ft)
Summer	4 to 12 ft	night & dusk	Outside-bend hole (mile 0.6) (9 ft)
Fall	4 to 12 ft	dusk	Outside-bend hole (mile 0.6) (9 ft)
Winter	4 to 12 ft	midday	Outside-bend hole (mile 0.6) (9 ft)

Rock Bass fishing at Monocacy River

Spring puts rock bass in skinny water — 2 to 10 ft is the zone. As the season builds they drop to 3 to 12 ft, wintering in 4 to 12 ft. Fall rock bass concentrate at Current seam (mile 17.4), a prime-rated current seam around 7 ft. Warm-month bites cluster around the evening. A ned rig (small) or a marabou jig covers the summer program.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 10 ft	midday & dawn	open water	1/16 oz jig + grub, Small inline spinner
Summer	3 to 12 ft	dusk	Current seam (mile 17.4) (7 ft)	Ned rig (small), Marabou jig
Fall	4 to 12 ft	midday	Current seam (mile 17.4) (7 ft)	Small tube jig, Inline spinner
Winter	4 to 12 ft	midday	Current seam (mile 17.4) (7 ft)	Tungsten jig + plastic, Small spoon + spike

Bluegill fishing at Monocacy River

Spring bluegill on Monocacy River hold shallow, usually 1 to 6 ft. By summer they slide out to 3 to 12 ft, and by winter most fish are in 4 to 12 ft. The chart's best answer is Current seam (mile 17.4) — current seam, 7 ft, good for fall. Prime time lands in early morning and the evening. The summer box starts with a small sponge spider (fly) or a micro tube jig.

Season	Depth	Best window	Start at	Go-to baits
Spring	1 to 6 ft	midday & dusk	open water	1/32 oz jig + micro plastic, Tiny popper (evenings)
Summer	3 to 12 ft	dawn & dusk	open water	Small sponge spider (fly), Micro tube jig
Fall	4 to 12 ft	midday	Current seam (mile 17.4) (7 ft)	Micro jig + waxworm, Small spoon tipped
Winter	4 to 12 ft	midday	Current seam (mile 17.4) (7 ft)	Tungsten ice jig + plastic, Tiny spoon

Common Carp fishing at Monocacy River

Come spring, look for common carp tight to the bank in 2 to 10 ft. Expect a summer slide to 2 to 12 ft, then a winter hold in 4 to 12 ft. Start at Outside-bend hole (mile 0.6). It's a creek channel holding about 9 ft of water and rates prime come fall. Prime time lands in early morning and the evening.

Season	Depth	Best window	Start at
Spring	2 to 10 ft	midday & dawn	open water
Summer	2 to 12 ft	dawn & dusk	open water
Fall	3 to 12 ft	midday	Outside-bend hole (mile 0.6) (9 ft)
Winter	4 to 12 ft	midday	Outside-bend hole (mile 0.6) (9 ft)

Notable structure

The chart marks 23 structure features on Monocacy River; the deepest is Outside-bend hole (mile 0.6) at about 9 ft.

Outside-bend hole (mile 0.6): creek channel, around 9 ft
Outside-bend hole (mile 3.7): creek channel, around 9 ft
Outside-bend hole (mile 5.9): creek channel, around 9 ft
Outside-bend hole (mile 8.1): creek channel, around 9 ft
Outside-bend hole (mile 10.0): creek channel, around 9 ft
Outside-bend hole (mile 12.1): creek channel, around 9 ft
Outside-bend hole (mile 15.2): creek channel, around 9 ft
Outside-bend hole (mile 19.6): creek channel, around 9 ft
Outside-bend hole (mile 21.8): creek channel, around 9 ft
Outside-bend hole (mile 24.3): creek channel, around 9 ft
Outside-bend hole (mile 27.4): creek channel, around 9 ft
Outside-bend hole (mile 29.9): creek channel, around 9 ft
Outside-bend hole (mile 33.0): creek channel, around 9 ft
Outside-bend hole (mile 35.5): creek channel, around 9 ft

Public access & boat ramps

Boat launch — ramp
Boat launch — ramp
Boat launch — ramp
Boat launch — ramp (concrete)
Boat launch — ramp (concrete)
Boat launch — ramp
Monocacy River Boat Ramp — ramp (concrete)

Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. Confirm conditions and fees locally before you launch.

Monocacy River fishing regulations

Season dates, license requirements, and size and bag limits for Maryland waters are set by the Maryland DNR — and special regulations can apply to Monocacy River specifically, so confirm the current rules before you fish.

Check the official Maryland fishing regulations →

Common questions

How deep is Monocacy River?

Monocacy River is about 12 ft (4 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.

What fish are in Monocacy River?

Anglers target smallmouth bass, largemouth bass, channel catfish, rock bass, bluegill, common carp on Monocacy River.

Where is the best fishing spot on Monocacy River?

Outside-bend hole (mile 0.6) is the top-rated area: a creek channel in about 9 ft of water that rates prime for channel catfish in summer. The map above holds the full rated-spot list for every species and season.

When is the best time to fish Monocacy River?

For smallmouth 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.

What are the fishing regulations for Monocacy River?

Fishing on Monocacy 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.

Nearby waters

Greenbrier Lake 16 mi · Little Seneca Lake 18 mi · Piney Run Lake 19 mi · Clopper Lake 22 mi · Liberty Reservoir 23 mi · T. Howard Duckett Reservoir 32 mi · Lake Marburg 32 mi, PA · Prettyboy Reservoir 34 mi · Gunpowder Falls 36 mi · Potomac River (Upper) 38 mi, MD/WV · Loch Raven Reservoir 40 mi · Sleepy Creek Lake 44 mi, WV

See how Monocacy River stacks up: best largemouth bass lakes in Maryland · best smallmouth bass lakes in Maryland · best bluegill lakes in Maryland · best channel catfish lakes in Maryland

Browse all Maryland 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.