Mann Lake Depth Map & Fishing Spots (OR)

Hatch outlook

Callibaetis (Speckled Dun)Active window

Typical here: Aug 15 – Sep 15 · the smaller fall brood

nymphthe hours before the midday emergence — nymphs rise off the weed tops in a vertical zigzag that can take hours — sources split between slow 2–4 inch strips with long pauses and a quicker steady retrieve; carry both speeds
dunmidday, roughly 11am into early afternoon
spinnermid-to-late-morning falls

Trout browse the weed-bed edges knocking nymphs loose, then cruise the flats sipping duns at midday — the marquee western lake mayfly.

The midday emergence puts cruisers over weed flats in under 20 ft: a casting bubble with a #14 Callibaetis nymph retrieved dead-slow with pauses is the honest match. Between hatch hours, small spoons and #1 inline spinners along the weed edges and drop-offs pick off the same fish.

The event happens over weed flats and weed-bed edges in 20 ft of water or less

Chironomids (stillwater midges)Active window

Typical here: May 1 – Oct 31

nymphearly morning, start of the day — fish the bloodworm ON the bottom — 4–6 inches off the mud before the emergence starts
pupathe cool morning hours are prime — as the emergence builds, slide the pupa up to 12–15 inches off bottom under the indicator; a little wind chop does the jigging

Concentrates by DEPTH BAND and mud type, not a fixed spot: roughly 20–25 ft in spring, deeper midsummer, in against the feeder creeks in summer heat, 5–25 ft in fall. Match the band.

This one translates almost perfectly: a slip float with a 1/64–1/100 oz midge-pattern jig set 4–15 inches off bottom over a mud flat, dead-sticked with the chop doing the work. Depth control is everything — no moving lure imitates a hanging pupa; the float rig IS the technique.

The event happens over open mud flats alongside weedlines, channels and basin edges; feeder-creek mouths in summer heat

Water boatman fall flightsActive window

Typical here: Aug 25 – Oct 10 · peaks on crisp, bright fall days after the first cold snap

adultmiddday-ish on calm, sunny fall days — the fishable moment is the splashdown: boatmen dive in headfirst trailing an air bubble and make repeated trips back to the surface — a fly or lure that dives nose-first on the drop imitates exactly this

Takes are seldom subtle — trout ravage boatmen as they hit the water and during their subsurface runs.

Tailor-made for hardware: a small 1/16 oz silver-bellied spoon or jig cast AT the rings of a splashdown sinks headfirst exactly like the natural — twitch-pause it back through the top few feet. On flight days fan-cast the shallow weed margins.

The event happens over near-shore shallows, weed beds and shoal margins on calm sunny fall afternoons

Grasshoppers (east-side summer)Active window

Typical here: Jun 15 – Sep 30

adultall day in high summer, best when afternoon wind knocks bugs onto the water

Pulls fish to the windward grassy banks and edges for months — fish the bank the wind blows ONTO.

The friendliest crossover of the summer: on lakes, drift the windward bank with a bubble-and-foam-hopper — the bubble's splash doesn't hurt a hopper presentation. On rivers, the same rig dead-drifted along the undercut grass banks, or small gold spinners under the banks between rises.

The event happens over grassy banks, undercut edges and windward shorelines

Next on this water

Damselfly migration · forageMay 15 – Jul 31 · in ~9 months

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 Mann Lake

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

No shared catches here yet — be the first.Log a catch from the map above and share it to put Mann Lake on the board.

Fishing Mann Lake: what the data says

363-acre lake in Oregon. The lake tops out around 10 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. What follows comes from the same scoring engine that paints the spots above.

The drawn water covers 362 acres wrapped in 3.3 miles of bank. 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. Tip to tip the water measures near 1.1 mi with a 0.7-mi widest point. If the bite dies, Fish Lake is 10 mi to the west.

Rainbow Trout fishing at Mann Lake

When the water first warms, rainbow trout slide up into 3 to 10 ft. There's no big seasonal slide here — summer means 3 to 10 ft, winter 2 to 10 ft. Start at Break off the point. It's a drop-off holding about 5 ft of water and rates prime come winter. The feeding windows run early morning and the evening. Keep a dodger + spoon (deep troll) or a flutter spoon rigged through the warm months.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 10 ft	dawn & dusk	Main-lake point (8 ft)	Inline spinner (silver), Small spoon
Summer	3 to 10 ft	dawn & dusk	Break off the point (5 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	3 to 10 ft	dawn & dusk	Main-lake point (8 ft)	Casting spoon, Jerkbait over shoals
Winter	2 to 10 ft	dawn	Break off the point (5 ft)	Jigging spoon, Tube jig (white)

Brown Trout fishing at Mann Lake

The spring pattern is a shallow one: brown trout in 1 to 10 ft. The depth story barely changes: 3 to 10 ft through summer, 1 to 10 ft in winter. Top water on the chart: Break off the point, a drop-off in the 5 ft range, prime in summer. Time it for after dark and early morning. Summer baits: a spoon at the thermocline or a deep stickbait (night) gets it done.

Season	Depth	Best window	Start at	Go-to baits
Spring	1 to 10 ft	dawn & dusk	Main-lake point (8 ft)	Stickbait off planer boards (shallow), Small spoon along mud lines
Summer	3 to 10 ft	night & dawn	Break off the point (5 ft)	Spoon at the thermocline, Deep stickbait (night)
Fall	2 to 10 ft	dusk & dawn	Main-lake point (8 ft)	Jerkbait over gravel, Casting spoon
Winter	1 to 10 ft	dawn	Break off the point (5 ft)	Jigging spoon, Small stickbait (slow)

Brook Trout fishing at Mann Lake

Come spring, look for brook trout tight to the bank in 1 to 10 ft. Through summer count on 3 to 10 ft; the winter hold is 2 to 10 ft. If you only fish one area, make it Deep basin: a deep basin around 9 ft that scores prime in summer. Best bite is early morning and the evening. A small spoon fished deep or a trolled lake-clear wobbler + worm is the honest summer answer here.

Season	Depth	Best window	Start at	Go-to baits
Spring	1 to 10 ft	dawn & dusk	Main-lake point (8 ft)	Small inline spinner (gold), Tiny spoon
Summer	3 to 10 ft	dawn & dusk	Deep basin (9 ft)	Small spoon fished deep, Trolled lake-clear wobbler + worm
Fall	1 to 10 ft	midday & dawn	Main-lake point (8 ft)	Small spoon (orange), Spinner
Winter	2 to 10 ft	dawn	Deep basin (9 ft)	Small jigging spoon, Tungsten jig + plastic

Yellow Perch fishing at Mann Lake

In spring, yellow perch run shallow here, mostly 3 to 10 ft. Summer keeps them at 3 to 10 ft, and they winter in 3 to 10 ft. Shallow bay flat is the standout, a weed flat at roughly 3 ft, rated prime for spring yellow perch. Time it for early morning. You won't need more than a drop-shot micro plastics or a small spoon tipped with worm most summer days.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 10 ft	midday & dawn	Shallow bay flat (3 ft)	Small jig + curly tail, Perch-pattern micro crank
Summer	3 to 10 ft	dawn	Deep basin (9 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	3 to 10 ft	midday	Deep basin (9 ft)	Jigging spoon (small), Perch rig / spreader
Winter	3 to 10 ft	midday & dawn	Deep basin (9 ft)	Tungsten jig + spikes, Rattle spoon (small)

Notable structure

Mann Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 9 ft down.

Deep basin: deep basin, around 9 ft
Main-lake point: point, around 8 ft
Secondary point: point, around 8 ft
Break off the point: drop-off, around 5 ft
Shallow bay flat: weed flat, around 3 ft
Back-bay flat: weed flat, around 3 ft

Mann Lake fishing regulations

Season dates, license requirements, and size and bag limits for Oregon waters are set by the Oregon Department of Fish and Wildlife — and special regulations can apply to Mann Lake specifically, so confirm the current rules before you fish.

Check the official Oregon fishing regulations →

Common questions

How deep is Mann Lake?

Mann Lake is about 10 ft (3 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 Mann Lake?

Anglers target rainbow trout, brown trout, brook trout, yellow perch on Mann Lake.

Where is the best fishing spot on Mann Lake?

Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for yellow perch in spring. The interactive chart above rates every spot for each species and season.

When is the best time to fish Mann Lake?

For rainbow 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.

What are the fishing regulations for Mann Lake?

Fishing on Mann Lake is regulated by the Oregon Department of Fish and Wildlife. Check the official Oregon regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.

Nearby waters

Fish Lake 10 mi · Onion Valley Reservoir 76 mi, NV · Hart Lake 76 mi · Catnip Reservoir 79 mi, NV · Succor Creek Reservoir 80 mi, ID · Beulah Reservoir 81 mi · Bully Creek Reservoir 101 mi · Lake Lowell 105 mi, ID · Strawberry Lake 107 mi · Chimney Reservoir 115 mi, NV · Malheur Reservoir 116 mi · Little Blue Creek Reservoir 123 mi, ID

See how Mann Lake stacks up: best rainbow trout lakes in Oregon · best yellow perch lakes in Oregon · best brown trout lakes in Oregon · best brook trout lakes in Oregon

Browse all Oregon 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.