Blue Lake Depth Map & Fishing Spots (ID)

Hatch outlook

Grasshoppers (east-side summer)Active window

Typical here: Jul 1 – Oct 15 · until the hard frosts of mid-October; on the Missouri, August hoppers fish mid-river, not the banks

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

Spruce MothActive window

Typical here: Jul 20 – Aug 31 · a conifer-forest event — it needs fir and lodgepole on the banks, so it's a Rock Creek / Blackfoot / upper Bitterroot specialty

adultmorning through midday — moths don't enter the water willingly — landings are sporadic and near the conifer banks; fish the imitation LOW in the film with minimal floatant, even fully drowned, with a little movement

When the moths show, just about every run produces — large trout key on them so hard that one pattern carries the whole box for two weeks.

Honest limit: a small drowned-surface moth has no lure analog. The workable rig is a casting bubble with a drowned moth pattern along the timbered banks in the morning; otherwise fish spinners early and late and leave the moth window to the film.

2–3 weeks at best, and day-to-day — fish key on the moths when they show and vanish with them

The event happens over banks under conifers — the moths rarely reach mid-river

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 Blue 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 Blue Lake on the board.

Fishing Blue Lake: what the data says

349-acre lake in Idaho. The lake tops out around 20 ft. The depth picture is modeled, anchored to the true shoreline and the water's published max depth — a scouting aid, never a chart to run a boat by. The season-by-season read for each species follows, from the map's own numbers.

Traced from the shoreline, Blue Lake runs 348 acres with 4.6 miles of edge. Index 1.8 on the shoreline: a few honest points and pockets, nothing labyrinthine. The shallow band under 15 ft claims about 85% of the surface on the model — that's where the groceries are. The basin spans about 1.7 mi end to end and 0.7 mi across at its widest. For a second option, Cave Lake lies 4 mi southeast.

Rainbow Trout fishing at Blue Lake

The spring pattern is a shallow one: rainbow trout in 5 to 20 ft. The depth story barely changes: 5 to 20 ft through summer, 4 to 20 ft in winter. Top water on the chart: Break off the point, a drop-off in the 9 ft range, prime in winter. Time it for early morning and the evening. 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 (8 ft)	Inline spinner (silver), Small spoon
Summer	5 to 20 ft	dawn & dusk	Break off the point (9 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	6 to 20 ft	dawn & dusk	Main-lake point (8 ft)	Casting spoon, Jerkbait over shoals
Winter	4 to 20 ft	dawn	Break off the point (9 ft)	Jigging spoon, Tube jig (white)

Brown Trout fishing at Blue Lake

Early season brown trout use the shallows, holding in 2 to 20 ft. Even in summer they hold at 6 to 20 ft; winter keeps them in 3 to 20 ft. Put Break off the point first on the milk run — a drop-off near 9 ft that grades prime for summer. In summer the feeding windows fall in after dark and early morning. Tie on a spoon at the thermocline or a deep stickbait (night) and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 20 ft	dawn & dusk	Main-lake point (8 ft)	Stickbait off planer boards (shallow), Small spoon along mud lines
Summer	6 to 20 ft	night & dawn	Break off the point (9 ft)	Spoon at the thermocline, Deep stickbait (night)
Fall	3 to 20 ft	dusk & dawn	Main-lake point (8 ft)	Jerkbait over gravel, Casting spoon
Winter	3 to 20 ft	dawn	Break off the point (9 ft)	Jigging spoon, Small stickbait (slow)

Brook Trout fishing at Blue Lake

Start shallow in spring: brook trout sit in 2 to 15 ft that time of year. Summer pushes them deeper, 6 to 20 ft, and winter fish settle into 3 to 20 ft. The spot to know is Deep basin, a deep basin in about 17 ft of water that rates prime for brook trout in summer. Warm-month bites cluster around early morning and the evening. Throw a small spoon fished deep or a trolled lake-clear wobbler + worm until the fish tell you otherwise.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 15 ft	dawn & dusk	Main-lake point (8 ft)	Small inline spinner (gold), Tiny spoon
Summer	6 to 20 ft	dawn & dusk	Deep basin (17 ft)	Small spoon fished deep, Trolled lake-clear wobbler + worm
Fall	2 to 15 ft	midday & dawn	Main-lake point (8 ft)	Small spoon (orange), Spinner
Winter	3 to 20 ft	dawn	Deep basin (17 ft)	Small jigging spoon, Tungsten jig + plastic

Yellow Perch fishing at Blue Lake

Spring yellow perch on Blue Lake hold shallow, usually 3 to 12 ft. They move out to 6 to 20 ft in summer and finish the year down in 6 to 20 ft. Put Shallow bay flat first on the milk run — a weed flat near 3 ft that grades prime for spring. The feeding windows run early morning. The summer box starts with a drop-shot micro plastics or a small spoon tipped with worm.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	Shallow bay flat (3 ft)	Small jig + curly tail, Perch-pattern micro crank
Summer	6 to 20 ft	dawn	Deep basin (17 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	6 to 20 ft	midday	Deep basin (17 ft)	Jigging spoon (small), Perch rig / spreader
Winter	6 to 20 ft	midday & dawn	Deep basin (17 ft)	Tungsten jig + spikes, Rattle spoon (small)

Notable structure

Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 17 ft.

Deep basin: deep basin, around 17 ft
Break off the point: drop-off, around 9 ft
Main-lake point: point, around 8 ft
Secondary point: point, around 8 ft
Shallow bay flat: weed flat, around 3 ft
Back-bay flat: weed flat, around 3 ft

Blue Lake fishing regulations

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

Check the official Idaho fishing regulations →

Common questions

How deep is Blue Lake?

Blue Lake is about 20 ft (6 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 Blue Lake?

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

Where is the best fishing spot on Blue 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 Blue 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 Blue Lake?

Fishing on Blue Lake is regulated by the Idaho Fish and Game. Check the official Idaho regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.

Nearby waters

Cave Lake 4 mi · Lake Coeur d'Alene 5 mi · Killarney Lake 6 mi · Chatcolet Lake 9 mi · Bull Run Lake 10 mi · Rose Lake 11 mi · Liberty Lake 21 mi, WA · Spokane River 28 mi, WA · Newman Lake 28 mi, WA · Kelso Lake 36 mi · Lower Glidden Lake 44 mi · Lost Lake 44 mi

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

Browse all Idaho 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.