Grass Lake Depth Map & Fishing Spots (CA)

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Lake depth chart

Grass Lake, CA

Max 10 ft

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Where to start

Callibaetis (Speckled Dun) window is on — see the hatch outlook

Hatch outlook

Callibaetis (Speckled Dun)Active window

Typical here: May 1 – Oct 1 · multi-brood; a documented midsummer lull when surface temps push fish deep

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: Apr 25 – Oct 31 · end of April to the end of October at Crowley — the main food source for the entire season

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

Grasshoppers (east-side summer)Active window

Typical here: Jul 1 – Sep 30 · the East Walker and Upper Owens terrestrial program

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 25 – Aug 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 Grass 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 Grass Lake on the board.

Fishing Grass Lake: what the data says

20-acre lake near Plumas County. The lake tops out around 10 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. Here's the year, species by species, as the scoring engine sees it.

On the chart, Grass Lake draws 20 acres inside 0.8 miles of shoreline. At index 1.3 the outline is almost a bowl — read the depth changes, not the shoreline. All of it is shallow-zone water — under ~15 ft across the entire basin, so the food chain has the run of the place. Call it 0.3 mi long by 0.2 mi wide at the broadest reach. You'll find it in Plumas County. Closest neighbour on DepthScout: Rock Lake, 1 mi south of here.

Brook Trout fishing at Grass Lake

In spring, brook trout run shallow here, mostly 1 to 10 ft. Summer keeps them at 3 to 10 ft, and they winter in 2 to 10 ft. Deep basin is the standout, a deep basin at roughly 9 ft, rated prime for summer brook trout. Time it for early morning and the evening. You won't need more than a small spoon fished deep or a trolled lake-clear wobbler + worm most summer days.

Season	Depth	Best window	Start at	Go-to baits
Spring	1 to 10 ft	dawn & dusk	Shallow bay flat (3 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	open water	Small spoon (orange), Spinner
Winter	2 to 10 ft	dawn	Deep basin (9 ft)	Small jigging spoon, Tungsten jig + plastic

Brown Trout fishing at Grass Lake

Come spring, look for brown trout tight to the bank in 1 to 10 ft. Through summer count on 3 to 10 ft; the winter hold is 1 to 10 ft. Start at Shoreline break. It's a drop-off holding about 5 ft of water and rates prime come summer. Prime time lands in after dark and early morning. A spoon at the thermocline or a deep stickbait (night) is the honest summer answer here.

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

Rainbow Trout fishing at Grass Lake

Spring puts rainbow trout in skinny water — 3 to 10 ft is the zone. Summer fish stay in 3 to 10 ft, and winter fish hold in 2 to 10 ft. Winter rainbow trout concentrate at Shoreline break, a prime-rated drop-off around 5 ft. Warm-month bites cluster around early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon covers the summer program.

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

Notable structure

Structure-wise the chart holds 4 features, led in depth by Deep basin at roughly 9 ft.

Deep basin: deep basin, around 9 ft
Shoreline break: drop-off, around 5 ft
Shallow bay flat: weed flat, around 3 ft
Back-bay flat: weed flat, around 3 ft

Grass Lake fishing regulations

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

Check the official California fishing regulations →

Common questions

How deep is Grass Lake?

Grass 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 Grass Lake?

Anglers target brook trout, brown trout, rainbow trout on Grass Lake.

Where is the best fishing spot on Grass Lake?

Shoreline break is the top-rated area: a drop-off in about 5 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 Grass Lake?

For brook 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 Grass Lake?

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

Nearby waters

Rock Lake 1 mi · Jamison Lake 1 mi · Eureka Lake 3 mi · Salmon Lake, Upper 5 mi · Packer Lake 8 mi · Sardine Lake, Upper 9 mi · Lake Davis 16 mi · Weaver Lake 18 mi · Sawmill Lake 20 mi · Lower Rock Lake 21 mi · Culbertson Lake 22 mi · Lindsey Lakes 22 mi

See how Grass Lake stacks up: best rainbow trout lakes in California · best brown trout lakes in California · best brook trout lakes in California

More water nearby: Plumas County fishing maps (14 charts). Browse all California 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.