Multnomah County Lake Quality
Oregon, 7 lakes, measured by Oregon DEQ
Multnomah County has 7 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The 7 monitored lakes in Multnomah County carry whatever clarity, phosphorus, and chlorophyll-a readings Oregon DEQ has published, shown as reported.
Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.
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Quick Answers for Multnomah County
Planning a trip? Check special fishing regulations for Smith Lake — or check the official Oregon fishing regulations.
All Lakes in Multnomah County
7 lakes · 0 ranked on readings, 7 without enough sampling0 lakes ranked on readings · 7 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|
| Smith LakeMultnomah | No recent samples | No recent samples | No recent samples | No recent samples | 4 ft | Not recorded | |
| Bybee LakeMultnomah | No recent samples | No recent samples | No recent samples | No recent samples | 4 ft | Not recorded | |
| Jewit LakeMultnomah | No recent samples | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| Blue LakeMultnomah | No recent samples | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Fairview LakeMultnomah | No recent samples | No recent samples | No recent samples | No recent samples | 5 ft | Not recorded | |
| Bull Run Reservoir Number TwoMultnomah | No recent samples | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| Bull Run Reservoir Number OneMultnomah | No recent samples | No recent samples | No recent samples | No recent samples | 150 ft | Not recorded |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Source: the Oregon Department of Environmental Quality. See data sources.