Sidley Lake
Okanogan County, Washington104 acresView mapDirections
No nutrient or algae sampling on record from Washington Ecology for this lake.
- Public access
Sidley Lake in Okanogan County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 104 acres.
Sidley Lake is a 104-acre lake in Okanogan 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 Sidley Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Sidley 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.
Water quality measurements for Sidley Lake
These are the measurements Washington Ecology publishes for Sidley 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 Sidley Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
104 acres
Shoreline
2.4 mi
Public access
Yes
Listed by Washington Ecology
No bathymetric survey has been published for Sidley Lake, so its depth is not documented here.
Recreation & Access
- Sidley 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 Sidley Lake
Compare lakeside cabins, hotels, and vacation rentals near Sidley Lake in Okanogan 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 Sidley Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Washington’s top lakes →
Follow Sidley Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Sidley Lake
Nearby Lakes in Okanogan County
Frequently asked questions about Sidley Lake
Where is Sidley Lake?
- Sidley Lake is a lake in Okanogan County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.
What is the water quality of Sidley Lake?
- Sidley Lake in Okanogan County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 104 acres.
Is Sidley Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Sidley Lake?
- Sidley Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Sidley Lake. Public access is listed as yes.
Can I fish at Sidley Lake?
- Sidley 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.
Explore Sidley Lake across LakeQuality
More lakes in Washington
Other Lakes in Washington
Where this data comes from
Measurements for Sidley Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory