Island Lake Depth Map & Fishing Spots (Mason County, 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 Island 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 Island Lake on the board.

Fishing Island Lake: what the data says

112-acre lake near Mason County. The lake tops out around 30 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's the year, species by species, as the scoring engine sees it.

Rainbow Trout fishing at Island Lake

In spring, rainbow trout run shallow here, mostly 5 to 20 ft. Summer pushes them deeper, 8 to 30 ft, and winter fish settle into 6 to 30 ft. Break off the point is the standout, a drop-off at roughly 12 ft, rated prime for winter rainbow trout. Time it for early morning and the evening. You won't need more than a dodger + spoon (deep troll) or a flutter spoon most summer days.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	Break off the point (12 ft)	Inline spinner (silver), Small spoon
Summer	8 to 30 ft	dawn & dusk	Break off the point (12 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	9 to 30 ft	dawn & dusk	Break off the point (12 ft)	Casting spoon, Jerkbait over shoals
Winter	6 to 30 ft	dawn	Break off the point (12 ft)	Jigging spoon, Tube jig (white)

Largemouth Bass fishing at Island Lake

Start shallow in spring: largemouth bass sit in 2 to 10 ft that time of year. Warm water sends them out to 8 to 20 ft; cold water stacks them in 9 to 30 ft. Top water on the chart: Break off the point, a drop-off in the 12 ft range, prime in winter. Fish it in early morning and the evening and you'll meet the bite. Throw a texas-rigged 10" worm or a deep-diving crankbait until the fish tell you otherwise.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 10 ft	dawn & dusk	Shallow bay flat (1 ft)	Spinnerbait, Chatterbait
Summer	8 to 20 ft	dawn & dusk	Break off the point (12 ft)	Texas-rigged 10" worm, Deep-diving crankbait
Fall	4 to 15 ft	midday & dawn	Main-lake point (1 ft)	Squarebill crankbait (shad), Spinnerbait
Winter	9 to 30 ft	midday	Break off the point (12 ft)	Blade bait, Jigging spoon

Smallmouth Bass fishing at Island Lake

The spring pattern is a shallow one: smallmouth bass in 3 to 12 ft. Midsummer fish sit out in 10 to 30 ft before dropping to 9 to 30 ft for winter. The spot to know is Break off the point, a drop-off in about 12 ft of water that rates prime for smallmouth bass in winter. Plan around early morning and the evening in the warm months. Summer baits: a drop shot (goby/minnow) or a ned rig gets it done.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	dawn & dusk	Main-lake point (1 ft)	Ned rig, Tube jig
Summer	10 to 30 ft	dawn & dusk	Break off the point (12 ft)	Drop shot (goby/minnow), Ned rig
Fall	8 to 25 ft	midday & dawn	Break off the point (12 ft)	Jerkbait, Blade bait
Winter	9 to 30 ft	midday	Break off the point (12 ft)	Blade bait, Hair jig

Yellow Perch fishing at Island Lake

When the water first warms, yellow perch slide up into 3 to 12 ft. Summer is a 10 to 30 ft game here, winter a 9 to 30 ft one. Start at Deep basin. It's a deep basin holding about 30 ft of water and rates prime come fall. The feeding windows run early morning. Keep a drop-shot micro plastics or a small spoon tipped with worm rigged through the warm months.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	Shallow bay flat (1 ft)	Small jig + curly tail, Perch-pattern micro crank
Summer	10 to 30 ft	dawn	Deep basin (30 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	9 to 30 ft	midday	Deep basin (30 ft)	Jigging spoon (small), Perch rig / spreader
Winter	9 to 30 ft	midday & dawn	Deep basin (30 ft)	Tungsten jig + spikes, Rattle spoon (small)

Bluegill fishing at Island Lake

Spring puts bluegill in skinny water — 1 to 6 ft is the zone. Warm water sends them out to 4 to 15 ft; cold water stacks them in 10 to 25 ft. Shallow bay flat is the standout, a weed flat at roughly 1 ft, rated prime for spring bluegill. Plan around early morning and the evening in the warm months. A small sponge spider (fly) or a micro tube jig covers the summer program.

Season	Depth	Best window	Start at	Go-to baits
Spring	1 to 6 ft	midday & dusk	Shallow bay flat (1 ft)	1/32 oz jig + micro plastic, Tiny popper (evenings)
Summer	4 to 15 ft	dawn & dusk	Shallow bay flat (1 ft)	Small sponge spider (fly), Micro tube jig
Fall	6 to 18 ft	midday	Break off the point (12 ft)	Micro jig + waxworm, Small spoon tipped
Winter	10 to 25 ft	midday	Deep basin (30 ft)	Tungsten ice jig + plastic, Tiny spoon

Crappie fishing at Island Lake

The spring pattern is a shallow one: crappie in 2 to 8 ft. Midsummer fish sit out in 10 to 25 ft before dropping to 9 to 30 ft for winter. The spot to know is Deep basin, a deep basin in about 30 ft of water that rates prime for crappie in winter. Plan around early morning and the evening in the warm months. Summer baits: a jig trolled/spider-rigged or a small crankbait (trolled) gets it done.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 8 ft	midday & dawn	Shallow bay flat (1 ft)	1/16 oz jig + tube, Curly-tail grub
Summer	10 to 25 ft	dawn & dusk	Break off the point (12 ft)	Jig trolled/spider-rigged, Small crankbait (trolled)
Fall	8 to 20 ft	dawn	Break off the point (12 ft)	Jig + minnow combo, Small swimbait (1.5-2")
Winter	9 to 30 ft	midday	Deep basin (30 ft)	Tungsten jig + soft plastic, Tiny jigging spoon

Notable structure

Count 5 structure marks on this chart. The deepest, Deep basin, sits near 30 ft.

Deep basin: deep basin, around 30 ft
Break off the point: drop-off, around 12 ft
Main-lake point: point, around 1 ft
Shallow bay flat: weed flat, around 1 ft
Back-bay flat: weed flat, around 1 ft

Public access & boat ramps

Island Lake — ramp (concrete)

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

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

Check the official Washington fishing regulations →

Common questions

How deep is Island Lake?

Island Lake is about 30 ft (9 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 Island Lake?

Anglers target rainbow trout, largemouth bass, smallmouth bass, yellow perch, bluegill, crappie on Island Lake.

Where is the best fishing spot on Island Lake?

Break off the point is the top-rated area: a drop-off in about 12 ft of water that rates prime for largemouth bass in winter. The map above holds the full rated-spot list for every species and season.

When is the best time to fish Island 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 Island Lake?

Fishing on Island 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

Lake Limerick 4 mi · Isabella Lake 5 mi · Phillips Lake 7 mi · Spencer Lake 7 mi · Forbes Lake 8 mi · Lost Lake 9 mi · Mason Lake 9 mi · Nahwatzel Lake 10 mi · Benson Lake 11 mi · U Lake 13 mi · Summit Lake 13 mi · Prickett Lake 14 mi

See how Island Lake stacks up: best largemouth bass lakes in Washington · best smallmouth bass lakes in Washington · best crappie lakes in Washington · best bluegill lakes in Washington

More water nearby: Mason County fishing maps (14 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.