Lake Shannon
Lake Shannon in Skagit County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1938 acres.
- Area
- 1,938 acres
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Why Lake Shannon 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 Shannon, 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 Shannon is a 1,938-acre lake in Skagit 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 Shannon
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 Shannon
Compare lakeside cabins, hotels, and vacation rentals near Lake Shannon in Skagit 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 Shannon
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,938 acres |
No bathymetric survey has been published for Lake Shannon, so its depth is not documented here.
Fishing Lake Shannon
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Frequently asked questions about Lake Shannon
Where is Lake Shannon?
- Lake Shannon is a lake in Skagit 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 Shannon?
- Lake Shannon in Skagit County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1938 acres.
Is Lake Shannon safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Shannon is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Lake Shannon come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.