Where is Lake Armstrong?

Lake Armstrong is a lake in Snohomish County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.

Are there boat ramps on Lake Armstrong?

Lake Armstrong has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Armstrong. Public access is listed as yes.

Can I fish at Lake Armstrong?

Lake Armstrong has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Washington's fish and wildlife agency, so check its current regulations before you go.

Lake Armstrong

Snohomish County, Washington30 acresView map Directions

No nutrient or algae sampling on record from Washington Ecology for this lake.

Area

30 acres

Surface area

Shoreline

1.1 mi

Measured length

Impaired · Nutrients (phosphorus, nitrogen)
Public access

See the measurements Directions Where to stay

Lake Armstrong in Snohomish County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 30 acres.

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Lake Armstrong is a 30-acre lake in Snohomish County, Washington. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, WA Ecology. Methodology: how these readings are compared.

What Lake Armstrong is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Lake Armstrong is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether Lake Armstrong is safe to swim in today is a call for the Washington State Department of Ecology and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Lake Armstrong

These are the measurements Washington Ecology publishes for Lake Armstrong, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about Lake Armstrong

Answers come straight from the public measurements and survey records on this page.

Lake Details

Surface area

30 acres

Shoreline

1.1 mi

Public access

Yes

Listed by Washington Ecology

No bathymetric survey has been published for Lake Armstrong, so its depth is not documented here.

Recreation & Access

Boat Landings

Yes

Public Access

Lake ArmstrongPublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays near Lake Armstrong

Compare lakeside cabins, hotels, and vacation rentals near Lake Armstrong in Snohomish County, Washington — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Lake Armstrong

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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Follow Lake Armstrong’s readings

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Fishing Lake Armstrong

→ Lake Armstrong fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Lake Armstrong is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 5).

Causes of impairment

Nutrients (phosphorus, nitrogen)

Designated uses not supporting: Aquatic life.

Source: EPA ATTAINS assessment unit WA17110008000659_001_001 · Official waterbody report

Nearby Lakes in Snohomish County

Sunday Lake6.2 miView →Lake Ki8.3 miView →Jsl Lake9.8 miView →Ross Lake—View →Lake Cassidy—View →Crabapple Lake9.5 miView →

Frequently asked questions about Lake Armstrong

Where is Lake Armstrong?: Lake Armstrong is a lake in Snohomish County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.
What is the water quality of Lake Armstrong?: Lake Armstrong in Snohomish County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 30 acres.
Is Lake Armstrong safe to swim in?: Nutrient and algae readings are not a swimming clearance. Lake Armstrong is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Are there boat ramps on Lake Armstrong?: Lake Armstrong has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Armstrong. Public access is listed as yes.
Can I fish at Lake Armstrong?: Lake Armstrong has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Washington's fish and wildlife agency, so check its current regulations before you go.