Lake Hannan
Lake Hannan in Snohomish County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 82 acres.
- Area
- 82 acres
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Why Lake Hannan 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 Hannan, 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 WA Ecology and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Hannan is a 82-acre lake in Snohomish County, Washington.
Source: EPA Water Quality Portal sampling records, WA Ecology, last sampled recent years. Grade methodology: LakeQuality methodology.
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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 Hannan
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 Hannan
Compare lakeside cabins, hotels, and vacation rentals near Lake Hannan in Snohomish 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 Lake Hannan
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 82 acres |
No bathymetric survey has been published for Lake Hannan, so its depth is not documented here.
Fishing Lake Hannan
Nearby Lakes in Snohomish County
Frequently asked questions about Lake Hannan
Where is Lake Hannan?
- Lake Hannan is a lake in Snohomish County, Washington. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Hannan?
- Lake Hannan in Snohomish County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 82 acres.
Is Lake Hannan safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Hannan 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 Hannan across LakeQuality
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Where this data comes from
Measurements for Lake Hannan come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.