Diamond 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 Diamond 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 Diamond Lake on the board.

Fishing Diamond Lake: what the data says

700-acre lake near Diamond Lake. The lake tops out around 55 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. Below is the species-by-species picture, pulled from the same data the map uses.

Drawn out, this is 700 acres of water rimmed by 4.6 miles of bank. At index 1.2 the outline is almost a bowl — read the depth changes, not the shoreline. Littoral water — the productive band under ~15 ft — makes up 31% of this chart. Tip to tip the water measures near 2 mi with a 0.7-mi widest point. The water lies in Pend Oreille County. Closest neighbour on DepthScout: Sacheen Lake, 6 mi west of here.

Brown Trout fishing at Diamond Lake

Spring brown trout on Diamond Lake hold shallow, usually 3 to 25 ft. They move out to 17 to 55 ft in summer and finish the year down in 5 to 35 ft. Put Break off the point first on the milk run — a drop-off near 45 ft that grades prime for summer. The feeding windows run after dark and early morning. The summer box starts with a spoon at the thermocline or a deep stickbait (night).

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 25 ft	dawn & dusk	Main-lake point (3 ft)	Stickbait off planer boards (shallow), Small spoon along mud lines
Summer	17 to 55 ft	night & dawn	Break off the point (45 ft)	Spoon at the thermocline, Deep stickbait (night)
Fall	5 to 30 ft	dusk & dawn	Main-lake point (3 ft)	Jerkbait over gravel, Casting spoon
Winter	5 to 35 ft	dawn	Break off the point (45 ft)	Jigging spoon, Small stickbait (slow)

Cutthroat Trout fishing at Diamond Lake

Spring cutthroat trout on Diamond Lake hold shallow, usually 3 to 15 ft. They move out to 10 to 35 ft in summer and finish the year down in 10 to 40 ft. Put Main-lake point first on the milk run — a point near 3 ft that grades prime for spring. The feeding windows run early morning and the evening. The summer box starts with a trolled spoon (small) or an inline spinner.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 15 ft	dawn & dusk	Main-lake point (3 ft)	Inline spinner (silver/gold), Small spoon
Summer	10 to 35 ft	dawn & dusk	Break off the point (45 ft)	Trolled spoon (small), Inline spinner
Fall	5 to 25 ft	dawn & dusk	Main-lake point (3 ft)	Casting spoon, Inline spinner
Winter	10 to 40 ft	dawn	Break off the point (45 ft)	Small jigging spoon, Marabou jig

Rainbow Trout fishing at Diamond Lake

Start shallow in spring: rainbow trout sit in 5 to 20 ft that time of year. Warm water sends them out to 8 to 30 ft; cold water stacks them in 8 to 40 ft. Top water on the chart: Break off the point, a drop-off in the 45 ft range, prime in winter. Fish it in early morning and the evening and you'll meet the bite. Throw a dodger + spoon (deep troll) or a flutter spoon until the fish tell you otherwise.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	Main-lake point (3 ft)	Inline spinner (silver), Small spoon
Summer	8 to 30 ft	dawn & dusk	Shallow bay flat (8 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	10 to 35 ft	dawn & dusk	Main-lake point (3 ft)	Casting spoon, Jerkbait over shoals
Winter	8 to 40 ft	dawn	Break off the point (45 ft)	Jigging spoon, Tube jig (white)

Notable structure

5 pieces of structure are mapped here — Deep basin, around 55 ft, is the deepest of them.

Deep basin: deep basin, around 55 ft
Break off the point: drop-off, around 45 ft
Shallow bay flat: weed flat, around 8 ft
Main-lake point: point, around 3 ft
Back-bay flat: weed flat, around 3 ft

Public access & boat ramps

Diamond Lake — ramp (concrete)

Access data: Washington WDFW — Water Access Sites. Confirm conditions and fees locally before you launch.

Diamond Lake stocking report

Date	Species	Count	Size
May 12	Rainbow trout	40,000	—
Apr 22	Rainbow trout	2,314	—
Apr 22	Rainbow trout	12,676	—
Apr 21	Rainbow trout	14,023	—
Apr 17	Brown Trout	5,890	—
Apr 17	Brown Trout	5,605	—
Apr 17	Rainbow trout	184	—
Apr 17	Rainbow trout	15,000	—

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

Diamond 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 Diamond Lake specifically, so confirm the current rules before you fish.

Check the official Washington fishing regulations →

Common questions

How deep is Diamond Lake?

Diamond Lake is about 55 ft (17 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 Diamond Lake?

Anglers target brown trout, cutthroat trout, rainbow trout on Diamond Lake.

Where is the best fishing spot on Diamond Lake?

Break off the point is the top-rated area: a drop-off in about 45 ft of water that rates prime for brown trout in summer. Every other rated spot, per species and season, is on the map above.

When is the best time to fish Diamond Lake?

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.

Is Diamond Lake stocked with fish?

Yes — per WDFW fish-stocking reports records, Diamond Lake was most recently stocked May 12 with 40,000 rainbow trout. The full stocking history is listed above.

What are the fishing regulations for Diamond Lake?

Fishing on Diamond 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

Sacheen Lake 6 mi · Davis Lake 8 mi · Marshall Lake 11 mi · Fan Lake 11 mi · Eloika Lake 11 mi · Deer Lake 18 mi · South Skookum Lake 18 mi · North Skookum Lake 19 mi · Blue Lake 20 mi, ID · Loon Lake 21 mi · Jumpoff Joe Lake 23 mi · Kelso Lake 24 mi, ID

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

More water nearby: Pend Oreille County fishing maps (11 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.