Lake Washington fishing conditions

Washington · Puget Sound / Seattle · 21,500 acres · max 214 ft

Urban water with docks, bridges and a strong smallmouth fishery

Sample dataUpdated October 19, 2026 — 12:03 AM

8.2out of 10

Current conditions

Excellent

Fishing score 82/100

How this score is calculated

Water temperature15.8 / 20

58°F and falling (-0.5°F / 3 days) against a 52–74°F active band.

Barometric pressure9.7 / 15

29.67 inHg and falling (-0.16 / 24 h).

Wind10.0 / 10

11 mph out of the NW. Ideal chop on wind-blown structure.

Water clarity8.2 / 10

11.5 ft of visibility. Very clear — downsize line and lengthen casts.

Water level9.8 / 10

+0.2 ft from normal pool and falling (-1.2 ft / 7 days).

Moon & solunar5.2 / 10

56% illumination. Quarter moon — weaker feeding periods, rely on light change.

Seasonal pattern10.0 / 10

Fall pattern is fully established.

Sky & rain12.8 / 15

89% cloud, 49°F air, 0.1 in of rain in 24 h.

What should I do today?

The single highest-percentage pattern for the conditions right now.

TargetSmallmouth Bass

Depth8–19 ft

LocationRock transitions, gravel flats, current seams and offshore humps

TechniqueNed rig / drop shot

Lure2.75 in Ned-rig finesse worm

ColorGreen pumpkin / smoke purple

RetrieveDrag and pause, 3–5 second pauses

Best window6:18 AM – 9:03 AM

WhyWater temperature is holding near 58°F, so the fall pattern is stable, falling pressure ahead of a change usually triggers a feeding window, heavy cloud extends the low-light bite well past sunrise, a 11 mph NW wind is stacking bait on the wind-blown banks.

Backup pattern

Squarebill crankbait along hard cover for largemouth bass — Docks and weed lines in the shallow bays — Union Bay, Juanita and Mercer Slough.

Right now

Current conditions

Water temp

58°F

▼ -0.5°F / 3 days

Air temp

49°F

89% cloud cover

Wind

11 mph

Out of the NW

Pressure

29.67"

▼ Falling pressure — a change is moving in

Water level

+0.2 ft

▼ -1.2 ft / 7 days

Clarity

11.5 ft

Slack water

Rain (24 h)

0.08"

No meaningful runoff

Moon

56%

First Quarter · solunar 12/100

Sunrise

6:43 AM

Low-light window opens 25 min earlier

Sunset

5:04 PM

Evening window runs the last 2 hours

Season

Fall

Pattern driving today's plan

Best window

6:18 AM

Through 9:03 AM

Timing

Today's fishing windows

12 AM6 AM12 PM6 PM11 PM

Solunar minor 212:20 AM – 1:20 AM
Solunar major 25:50 AM – 7:50 AM
Morning prime window6:18 AM – 9:03 AM
Sunrise6:43 AM
Solunar minor 112:20 PM – 1:20 PM
Evening window3:04 PM – 5:39 PM
Sunset5:04 PM
Solunar major 15:50 PM – 7:50 PM

Structure

Lake structure and depth zones

Typical structure profile for Lake Washington: thousands of private docks, i-90 and sr-520 floating bridges, weed lines in the shallow bays, steep drop-offs along the east shore. Average depth 108 ft, maximum 214 ft.

Thousands of private docks
I-90 and SR-520 floating bridges
Weed lines in the shallow bays
Steep drop-offs along the east shore
Sand and gravel flats near Juanita

Substrate

Bottom composition and why it matters

Sand 22%
Clean bottom for bait schools and sight-feeding fish, but little cover — look for the edge where sand meets something else.
Gravel 20%
Primary spawning substrate. Fish stack on gravel transitions when water hits the 58–66°F band.
Rock 18%
Holds heat in spring and crayfish year-round — the first place smallmouth and staging bass set up.
Mud 16%
Warms fastest in late winter and holds wintering bait, but goes dead in the summer heat.
Vegetation 12%
Oxygen, shade and ambush cover. The outside grass edge is the highest-percentage line on most lakes.
Clay 8%
Holds hard bottom in stained water and dumps the most colour after rain. Crankbait banks.
Timber 2%
Vertical cover fish use to change depth without leaving structure — key on standing timber during frontal swings.
Brush / artificial 2%
Man-made brush piles and docks concentrate crappie and bass, especially where they sit on a depth change.

Depth

Depth guide for today

Depth bands for today — adjusted for the fall pattern, current water temperature, cloud cover and wind.
Species	Depth today	Activity	Where they are here
Smallmouth Bass	8–19 ft	High	Gravel and rock in 10–30 ft; the bridge structure holds fish all summer. Drop shot and tubes.
Largemouth Bass	3–11 ft	Moderate	Docks and weed lines in the shallow bays — Union Bay, Juanita and Mercer Slough.
Yellow Perch	11–26 ft	High	Big schools on the sand flats in 18–35 ft.
Rainbow Trout	4–19 ft	High	Cutthroat cruise the top 20 ft, often near dock lines.

Targets

Target species at this water

Smallmouth Bass

Gravel and rock in 10–30 ft; the bridge structure holds fish all summer. Drop shot and tubes.

Active temp: 52–74°F
Structure: Rock transitions, gravel flats, current seams and offshore humps
Technique: Ned rig / drop shot
Bait: Crayfish, leeches
Lure: 2.75 in Ned-rig finesse worm (2.5"–4")
Color: Green pumpkin / smoke purple
Retrieve: Drag and pause, 3–5 second pauses
Best time: Mid-morning on cold fronts, low light in summer

Holds deep rock until water hits 48°F, moves to gravel spawning flats at 58–64°F, then splits between shallow current and 20–30 ft humps through summer.

Largemouth Bass

Docks and weed lines in the shallow bays — Union Bay, Juanita and Mercer Slough.

Active temp: 58–82°F
Structure: Submerged grass edges, main-lake points, laydowns and dock lines
Technique: Texas rig / swimbait
Bait: Live shiners
Lure: 4.5 in paddle-tail swimbait (3.5"–5")
Color: Green pumpkin / natural shad
Retrieve: Slow to moderate, bottom contact every few feet
Best time: First 3 hours after sunrise and the last 2 before dark

Stages from wintering creek channels to secondary points at 52–58°F, spawns on hard bottom at 62–68°F, then slides to grass edges and ledges once surface water passes 78°F.

Yellow Perch

Big schools on the sand flats in 18–35 ft.

Active temp: 45–68°F
Structure: Sand and gravel flats next to deeper basin water
Technique: Small jig with a minnow head
Bait: Minnow heads, perch eyes where legal
Lure: 1/8 oz jig (1.5"–2.5")
Color: Gold / chartreuse
Retrieve: Short hops on the bottom
Best time: Mid-morning

Schools tight on clean bottom; the school moves, so stay mobile.

Rainbow Trout

Cutthroat cruise the top 20 ft, often near dock lines.

Active temp: 45–65°F
Structure: Inflows, spring seeps, rip-rap banks and the thermocline in summer
Technique: Small spoons / inline spinners
Bait: Nightcrawler or dough bait off bottom
Lure: 1/8 oz casting spoon (1"–3")
Color: Silver / rainbow pattern
Retrieve: Steady with occasional stalls
Best time: First light and overcast afternoons

Cruises the surface layer whenever water is under 60°F and drops to the oxygenated band just above the thermocline in mid-summer.

Patterns

Season-by-season patterns

Winter

45–47°F

Deep smallmouth in 30–50 ft on a drop shot; slow everything down.

Spring

50–62°F

Smallmouth spawn on gravel at 55–62°F; largemouth in the shallow weedy bays.

Summer

68–72°F

Bridge pilings and deep docks; the boat traffic is heavy so early mornings matter.

Fall

52–66°F

Smallmouth school on points and flats chasing perch; one of the best windows of the year.

Outlook

7-day fishing forecast

Day	Score	Water	Wind	Pressure	Level	Clarity	Best species	Technique	Best window
Today	82Excellent	58°F	11 mph NW	29.67"	+0.2 ft	11.5 ft	Smallmouth Bass	Ned rig / drop shot	6:18 AM – 9:03 AM
Tue	90Excellent	58°F	4 mph NE	29.72"	+0.3 ft	7.3 ft	Smallmouth Bass	Ned rig / drop shot	6:19 AM – 9:04 AM
Wed	88Excellent	58°F	6 mph E	29.66"	-0.3 ft	11.8 ft	Smallmouth Bass	Ned rig / drop shot	6:21 AM – 9:06 AM
Thu	87Excellent	61°F	3 mph W	30.25"	+0.4 ft	9.5 ft	Smallmouth Bass	Ned rig / drop shot	6:22 AM – 9:07 AM
Fri	92Excellent	61°F	13 mph E	30.32"	+0.2 ft	7.9 ft	Smallmouth Bass	Ned rig / drop shot	6:24 AM – 9:09 AM
Sat	88Excellent	57°F	11 mph SE	29.96"	-0.3 ft	8.4 ft	Smallmouth Bass	Ned rig / drop shot	6:25 AM – 9:10 AM
Sun	92Excellent	60°F	4 mph SE	29.65"	+0.1 ft	12.3 ft	Smallmouth Bass	Ned rig / drop shot	6:27 AM – 9:12 AM

Trends

Last 7 days

Water temperature

0 °F

58°F

TueToday

Barometric pressure

-0.2 "

29.668000000000003"

TueToday

Wind

-3 mph

11 mph

TueToday

Water level

0 ft

0.2 ft

TueToday

Fishing activity

-10

TueToday

Water temperature has held within 0°F all week. Stable water means the established fall pattern should keep producing.

The water

About Lake Washington

Lake Washington runs the length of Seattle's east side and is one of the best urban fisheries in the country. Thousands of private docks, two floating bridges, weed lines and steep drop-offs give bass an enormous amount of structure, and the lake holds both smallmouth and largemouth plus a cutthroat and perch fishery.

Surface area: 21,500 acres
Max depth: 214 ft
Average depth: 108 ft
Elevation: 16 ft
Typical clarity: 10 ft
Annual level swing: 2 ft
Coordinates: 47.600, -122.250
Region: Puget Sound / Seattle

Local knowledge

Expert notes

The floating bridges are the single best summer structure on the lake. The anchor cables and the shade line under the pontoons hold smallmouth at 15–30 ft through August.
Perch schools here move constantly over the sand. When you find 25+ ft of clean sand with bait on the graph, stay — the smallmouth are usually within a cast.

Logistics

Access, ramps and boating

boat ramp

Gene Coulon Park (Renton)

Good south-end ramp with plenty of parking.

boat ramp

Magnuson Park

North-end access near Union Bay.

shore

Seward Park shoreline

Solid bank access for perch and smallmouth.

Rules

Regulations

Washington freshwater fishing license required.
Bass: statewide rules apply; check current size and bag limits.
Salmon and steelhead have separate seasons and require a catch record card.
Many docks are private property — fish them from the water, do not tie up.

Always verify current regulations with the relevant state wildlife agency before fishing. Washington Department of Fish & Wildlife

Transparency

Data sources

Where this data comes from

Conditions are modelled from each water's documented climate, structure and seasonal patterns. Modules marked “Live data integration pending” are not yet pulling from their API, so those values are clearly labelled as sample data rather than presented as real-time readings.

Weather API
Pending
NOAA / National Weather Service — Air temperature, wind, cloud cover, rainfall and barometric pressure with a 7-day forecast.
Water Level & Flow API
Pending
USGS Water Services — Reservoir stage, discharge and 7-day level trend from the nearest gauge.
Water Temperature
Pending
USGS / NOAA buoys — Surface water temperature and its multi-day trend.
Tide & Current API
Pending
NOAA CO-OPS — Tide predictions, current direction and speed for coastal zones.
Moon & Solunar
Live
Computed on-site — Moon phase, illumination and solunar major/minor periods are calculated from date and coordinates.
Water Clarity
Pending
Satellite imagery + angler reports — Visibility estimates by lake arm, refined by submitted fishing reports.
Fishing Regulations
Pending
State wildlife agencies — License, size and creel rules, linked to the official agency page for verification.
Map Data
Pending
Bathymetry + access point database — Depth zones, structure locations and boat ramps for the lake infographic.