Smith Lake
Multnomah County, Oregon509 acresView mapDirections
No nutrient or algae sampling on record from Oregon DEQ for this lake.
- Impaired · Habitat alterations
- 4 ft max depth
Smith Lake in Multnomah County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Maximum depth: 4 ft. Surface area: 509 acres.
Smith Lake is a 509-acre lake in Multnomah County, Oregon with a maximum depth of 4 feet.
Source: EPA Water Quality Portal sampling records, Oregon DEQ. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Smith Lake is listed impaired under Clean Water Act §303(d) (IR 5) for habitat alterations, hydrologic alteration, noxious aquatic plants, pH / acidity. Check local advisories before you swim.
Whether Smith Lake 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 Smith Lake
These are the measurements Oregon DEQ publishes for Smith 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 Smith Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
4 ft
Surface area
509 acres
Shoreline
6.5 mi
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Fishing Smith Lake
EPA Impairment Status
Smith Lake 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: Aquatic life, Recreation, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit OR_LK_1709001202_02_100856 · Official waterbody report
Nearby Lakes in Multnomah County
Frequently asked questions about Smith Lake
Where is Smith Lake?
- Smith Lake is a lake in Multnomah County, Oregon. Its water-quality measurements are published by Oregon DEQ and shown on this page as reported.
What is the water quality of Smith Lake?
- Smith Lake in Multnomah County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Maximum depth: 4 ft. Surface area: 509 acres.
Is Smith Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Smith Lake is listed impaired under Clean Water Act §303(d) (IR 5) for habitat alterations, hydrologic alteration, noxious aquatic plants, pH / acidity. Check local advisories before you swim.
How deep is Smith Lake?
- Smith Lake has a maximum depth of 4 feet. The lake covers 509 acres.
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Where this data comes from
Measurements for Smith Lake 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