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

How deep is Riley Lake?

Riley Lake has a maximum depth of 45 feet and an average depth of 22 feet. The lake covers 30 acres.

Are there boat ramps on Riley Lake?

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

Can I fish at Riley Lake?

Riley Lake 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.

Riley Lake

Snohomish County, Washington30 acresView map Directions

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

Max depth

45 ft

Bathymetric survey

Area

30 acres

Surface area

Shoreline

1 mi

Measured length

Impaired · Nutrients (phosphorus, nitrogen)
45 ft max depth
Public access

See the measurements Directions Where to stay

Riley Lake in Snohomish County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 45 ft. Surface area: 30 acres.

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Riley Lake is a 30-acre lake in Snohomish County, Washington with a maximum depth of 45 feet (22-foot average). 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 Riley Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Deep water45 ft surveyed max depth

Swimming conditions

No reading

Not rated

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

Whether Riley Lake 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 Riley Lake

These are the measurements Washington Ecology publishes for Riley Lake, 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 Riley Lake

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

Lake Details

Max depth

45 ft

Average depth

22 ft

Surface area

30 acres

Shoreline

1 mi

Public access

Yes

Listed by Washington Ecology

Recreation & Access

Boat Landings

Yes

Public Access

Riley LakePublic

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

Stays via Stay22

Stays near Riley Lake

Compare lakeside cabins, hotels, and vacation rentals near Riley Lake 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 Riley Lake

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Fishing Riley Lake

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

EPA Impairment Status

Riley Lake 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 WA17110008000654_001_001 · Official waterbody report

Nearby Lakes in Snohomish County

Twin Lakes5 miView →Lake Armstrong8.2 miView →Bosworth Lake14 miView →Lake Cassidy—View →Lake Roesiger17.1 ft clear—View →Lake Twentytwo—View →

Frequently asked questions about Riley Lake

Where is Riley Lake?: Riley Lake 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 Riley Lake?: Riley Lake in Snohomish County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 45 ft. Surface area: 30 acres.
Is Riley Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Riley Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Riley Lake?: Riley Lake has a maximum depth of 45 feet and an average depth of 22 feet. The lake covers 30 acres.
Are there boat ramps on Riley Lake?: Riley Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Riley Lake. Public access is listed as yes.
Can I fish at Riley Lake?: Riley Lake 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.