Blackmans Lake Depth Map & Fishing Spots (WA)

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 here are interpolated from real agency depth surveys (state DNR / USACE). Never use for navigation. Always check local regulations.

Loading depth chart…

Recent catches at Blackmans 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 Blackmans Lake on the board.

Fishing Blackmans Lake: what the data says

56-acre lake near Snohomish. The lake tops out around 25 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. Species by species, here's what the data says the year looks like.

Drawn out, this is 56 acres of water rimmed by 1.1 miles of bank. A shoreline index of 1.1 says round and simple: fish relate to depth changes here, not shoreline features. Roughly 50% of the water is 15 ft or less, the band where the food chain lives. Call it 0.4 mi long by 0.3 mi wide at the broadest reach. The water lies in Snohomish County. For a second option, Panther Lake lies 4 mi east.

Cutthroat Trout fishing at Blackmans Lake

Early season cutthroat trout use the shallows, holding in 3 to 15 ft. Summer is a 7 to 25 ft game here, winter a 6 to 25 ft one. The chart's best answer is Break off the point — drop-off, 21 ft, prime for summer. Best bite is early morning and the evening. Tie on a trolled spoon (small) or an inline spinner and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 15 ft	dawn & dusk	Main-lake point (5 ft)	Inline spinner (silver/gold), Small spoon
Summer	7 to 25 ft	dawn & dusk	Break off the point (21 ft)	Trolled spoon (small), Inline spinner
Fall	5 to 25 ft	dawn & dusk	Main-lake point (5 ft)	Casting spoon, Inline spinner
Winter	6 to 25 ft	dawn	Break off the point (21 ft)	Small jigging spoon, Marabou jig

Rainbow Trout fishing at Blackmans Lake

The spring pattern is a shallow one: rainbow trout in 5 to 20 ft. Midsummer fish sit out in 7 to 25 ft before dropping to 5 to 25 ft for winter. The spot to know is Break off the point, a drop-off in about 21 ft of water that rates prime for rainbow trout in winter. Plan around early morning and the evening in the warm months. Summer baits: a dodger + spoon (deep troll) or a flutter spoon gets it done.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	Main-lake point (5 ft)	Inline spinner (silver), Small spoon
Summer	7 to 25 ft	dawn & dusk	Break off the point (21 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	7 to 25 ft	dawn & dusk	Secondary point (6 ft)	Casting spoon, Jerkbait over shoals
Winter	5 to 25 ft	dawn	Break off the point (21 ft)	Jigging spoon, Tube jig (white)

Notable structure

7 pieces of structure are mapped here — Deep basin, around 25 ft, is the deepest of them.

Deep basin: deep basin, around 25 ft
Break off the point: drop-off, around 21 ft
Dock / pier line: dock line, around 10 ft
Secondary point: point, around 6 ft
Main-lake point: point, around 5 ft
Back-bay flat: weed flat, around 5 ft
Shallow bay flat: weed flat, around 4 ft

Blackmans Lake stocking report

Date	Species	Count	Size
Apr 6	Rainbow trout	1,580	—
Mar 17	Rainbow trout	3,420	—
Dec 3, 2025	Cutthroat trout	9,207	—
Nov 12, 2025	Rainbow trout	605	—
Oct 14, 2025	Rainbow trout	890	—

Source: WDFW fish-stocking reports, retrieved 2026-08-18.

Blackmans Lake fishing regulations

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

Check the official Washington fishing regulations →

Common questions

How deep is Blackmans Lake?

Blackmans Lake is about 25 ft (8 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.

What fish are in Blackmans Lake?

Anglers target cutthroat trout, rainbow trout on Blackmans Lake.

Where is the best fishing spot on Blackmans Lake?

Break off the point is the top-rated area: a drop-off in about 21 ft of water that rates prime for cutthroat trout in summer. Every other rated spot, per species and season, is on the map above.

When is the best time to fish Blackmans Lake?

For cutthroat 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.

Is Blackmans Lake stocked with fish?

Yes — per WDFW fish-stocking reports records, Blackmans Lake was most recently stocked Apr 6 with 1,580 rainbow trout. The full stocking history is listed above.

What are the fishing regulations for Blackmans Lake?

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

Nearby waters

Panther Lake 4 mi · Lake Stevens 5 mi · Flowing Lake 5 mi · Storm Lake 6 mi · Chain Lake 6 mi · Wagner Lake 8 mi · Lake Cassidy 8 mi · Stickney Lake 8 mi · Lake Cochran 9 mi · Martha Lake 9 mi · Lake Roesiger 9 mi · Devils Lake 9 mi

See how Blackmans Lake stacks up: best rainbow trout lakes in Washington · best cutthroat trout lakes in Washington

More water nearby: Snohomish County fishing maps (28 charts). Browse all Washington 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.