Lake Oswego
Lake Oswego in Clackamas County, Oregon is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 432 acres.
- Area
- 432 acres
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Why Lake Oswego has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Oswego, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Oregon DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Oswego is a 432-acre lake in Clackamas County, Oregon.
Source: EPA Water Quality Portal sampling records, Oregon DEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Oswego water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Oswego
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Lake Oswego
Compare lakeside cabins, hotels, and vacation rentals near Lake Oswego in Clackamas County, Oregon — 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 Oswego
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Planning a whole trip? See where to stay at Oregon’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 432 acres |
No bathymetric survey has been published for Lake Oswego, so its depth is not documented here.
Fishing Lake Oswego
Nearby Lakes in Clackamas County
Frequently asked questions about Lake Oswego
Where is Lake Oswego?
- Lake Oswego is a lake in Clackamas County, Oregon. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Oswego?
- Lake Oswego in Clackamas County, Oregon is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 432 acres.
Is Lake Oswego safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Oswego is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake Oswego across LakeQuality
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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.