Sanpoil River Arm
Sanpoil River Arm in Ferry County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 2217 acres.
- Area
- 2,217 acres
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Why Sanpoil River Arm 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 Sanpoil River Arm, 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.
Sanpoil River Arm is a 2,217-acre lake in Ferry 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 Sanpoil River Arm
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 Sanpoil River Arm
Compare lakeside cabins, hotels, and vacation rentals near Sanpoil River Arm in Ferry 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 Sanpoil River Arm
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2,217 acres |
No bathymetric survey has been published for Sanpoil River Arm, so its depth is not documented here.
Fishing Sanpoil River Arm
Nearby Lakes in Ferry County
Frequently asked questions about Sanpoil River Arm
Where is Sanpoil River Arm?
- Sanpoil River Arm is a lake in Ferry 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 Sanpoil River Arm?
- Sanpoil River Arm in Ferry County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 2217 acres.
Is Sanpoil River Arm safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Sanpoil River Arm 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 Sanpoil River Arm come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.