Lake Oswego
Clackamas County, Oregon432 acresView mapDirections
No nutrient or algae sampling on record from Oregon DEQ for this lake.
- Impaired · Algal growth
- 56 ft max depth
Lake Oswego in Clackamas County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Maximum depth: 55.8 ft. Surface area: 432 acres.
Lake Oswego is a 432-acre lake in Clackamas County, Oregon with a maximum depth of 56 feet (26-foot average).
Source: EPA Water Quality Portal sampling records, Oregon DEQ. Methodology: how these readings are compared.
What Lake Oswego is good for
From access and monitoring records, not editorial picks.
- Deep water55.8 ft surveyed max depth
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Lake Oswego is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, pH / acidity. Check local advisories before you swim.
Whether Lake Oswego is safe to swim in today is a call for the Oregon Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Oswego
These are the measurements Oregon DEQ publishes for Lake Oswego, 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 Oswego
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
55.8 ft
Average depth
25.9 ft
Surface area
432 acres
Shoreline
13.7 mi
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Stays near Lake Oswego
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Fishing Lake Oswego
EPA Impairment Status
Lake Oswego is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Drinking water, Aquatic life, Fish consumption, Recreation, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit OR_LK_1709001201_02_100853 · Official waterbody report
Nearby Lakes in Clackamas County
Frequently asked questions about Lake Oswego
Where is Lake Oswego?
- Lake Oswego is a lake in Clackamas County, Oregon. Its water-quality measurements are published by Oregon DEQ and shown on this page as reported.
What is the water quality of Lake Oswego?
- Lake Oswego in Clackamas County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Maximum depth: 55.8 ft. Surface area: 432 acres.
Is Lake Oswego safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Oswego is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, pH / acidity. Check local advisories before you swim.
How deep is Lake Oswego?
- Lake Oswego has a maximum depth of 55.8 feet and an average depth of 25.9 feet. The lake covers 432 acres.
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Where this data comes from
Measurements for Lake Oswego come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database