Washington lake guide
Blue Lake — Grant County Fishing
Blue Lake is a 534.4-acre Grant County rainbow-trout lake and one of Washington’s popular opening-day waters. WDFW’s 2026 plan calls for 52,523 put-grow-and-take rainbow trout plus tiger trout and brown trout fingerlings, making spring the primary trout window.
LocationGrant County, Washington
Primary targetsRainbow Trout
Best seasonSpring to early summer
Lake size534.4 acres
Guide reviewed
Scientific profile
Research snapshot
Average depth40 feet
Max depth69 feet
Elevation1,097 feet
Public launches1
Summer cautionHeat
Lake depth map
Depth contours may take a little time to load. Sorry for the inconvenience.
Contour line20 ft Visible depth label
Source: Washington State Department of Ecology. Historical survey data may not reflect current water levels or underwater hazards. Informational only; not for navigation.
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What makes Blue Lake — Grant County distinctive
Blue Lake — Grant County reaches about 69 feet at its deepest documented point.
Blue Lake — Grant County is documented in Grant County County with a dedicated FishyNW fishing and access profile.
Measured & official data
Water Science
Loading available public monitoring and fishery science…
Pass 3 · depth + water column
Seasonal Fish Habitat
Surface · 0 ft
How to read this data
Temperature, dissolved oxygen, clarity, nutrients, chlorophyll-a, pH, and conductivity are observations from public monitoring records and may be historical. Thermocline depth is shown only when FishyNW can derive a strong vertical temperature gradient from a measured profile. It is not treated as a permanent lake characteristic.
Trophic indication uses the Carlson Trophic State Index only when FishyNW can normalize a measured chlorophyll-a, Secchi, or total-phosphorus value. It is a derived ecological indicator, not an agency impairment determination.
Seasonal Fish Habitat is shown only when verified bathymetry overlaps a same-day, same-station temperature and dissolved-oxygen profile. It is a historical screening snapshot, not a live prediction of where fish are located.
For lake trout, FishyNW uses the broader USGS-tested screening combination of water at or below 15°C (59°F) and dissolved oxygen at or above 4 mg/L. For other coldwater species, FishyNW does not invent a preferred-temperature threshold; it shows only the observed thermocline-to-oxygenated-depth refuge when the evidence supports it.
Harmful-algae status is never inferred from missing data. Always check the linked state source for current advisories before contact recreation.
Open matched Water Quality Portal recordsOfficial depth chart
Official static bathymetry
Interactive contours available
Blue Lake — Grant County official depth chart
Open the official depth publication to inspect the lake chart. This static survey complements interactive contours when available and should not be used as a navigation chart.
Fishery record
Documented fish species
These species come from the lake record. Open a species guide for identification, seasonal behavior, and practical tactics without confusing general species guidance with a lake-specific survey result.
Fishery intelligence
Official fishery evidence
Agency survey records and measured fishery data, distilled for trip planning.
9
verified signals
Research & surveys
Official survey records available
Use the evidence
Turn records into a fishing plan
- Compare survey evidence with the seasonal guide.
- Use the map to connect depth, access, and structure.
- Confirm current rules and access before your trip.
Trip conditions
Current conditions
Loading the local forecast. Check access and official notices before leaving.
TodayLoading
WindLoading
GustsLoading
Rain chanceLoading
Four day outlook
Tools
Today's Lure Pick
Open Tools for species-specific lure guidance.
Angler interpretation
How the fishery changes through the seasons
This is the practical layer: use it alongside the documented species, depth, stocking, survey, access, and regulation record above. The current season opens first.
Spring
trout- Start here
- Cooler water, recent stocking, fish moving shallow, and protected shorelines or inlets that warm first.
- Watch for
- Cold fronts, changing water levels, muddy inflow, and early-season ramp conditions.
Summer
listed species- Start here
- Fish early or late, then adjust toward deeper water, shade, vegetation, or comfortable temperature zones.
- Watch for
- Heat, weeds, algae, heat, and heavier boat traffic.
Fall
trout- Start here
- Cooling water, shoreline structure, points, weed edges, and simple presentations that let you cover water.
- Watch for
- Wind on open water, rapidly changing weather, and shorter daylight windows.
Winter
trout- Start here
- Legal open-water or ice access, stable depth zones, and conservative cold-weather trip plans.
- Watch for
- Ice safety where relevant, ramps, road conditions, cold-water exposure, and current rules.
Know before you go
Rules and restrictions
Verify current WDFW season, selective-gear, and wildlife-area rules before fishing.
Local angler stops
Nearby bait & tackle
Independent and locally owned shops near this water. Call ahead if you need a specific bait or item.
Desert Fly Angler
Independent fly shopEphrata, Washington · Small Columbia Basin fly shop with flies, tying supplies, tackle, and local stillwater knowledge.
Local-business listings can change. FishyNW does not rank shops by payment or sponsorship. Verify current hours and inventory before driving.
Keep exploring
Nearby waters
Park Lake — Grant County
about 1.9 miles away
Park Lake is a 338.1-acre Sun Lakes–Dry Falls trout destination and one of Washington’s busiest opening-day waters. When…
Dry Falls Lake about 4.9 miles awayDry Falls Lake is a quality Grant County trout water popular with fly anglers, with rainbow, brown, and…
Deep Lake — Grant County about 5.9 miles awayDeep Lake is a 101.3-acre Grant County trout-and-kokanee water within Sun Lakes–Dry Falls State Park. WDFW survey work…
Billy Clapp Lake about 12.3 miles awayBilly Clapp Lake is a long Columbia Basin irrigation reservoir where kokanee, rainbow trout, walleye, bass, and panfish…
After the trip
Log what happened on the water
Use CatchSignal for catch reports, trip history, photos, and community activity. Keep your fishing history while controlling how much location detail you share.
Sources & feedback
Verified resources
Official links for this lake
Open the source that matches what you are planning.
Community feedback
See something that needs an update?
Send the correction and, when possible, the source. FishyNW reviews submissions before changing the guide.