Spearhead Lake
Skagit County, WashingtonView mapDirections
Not enough samples to grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. No letter yet. Here is what we do have.
- Limited data
Spearhead Lake in Skagit County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.8 ft visibility. Phosphorus: 14 µg/L.
- Clarity
- 10.8 ft
- Phosphorus
- 14 µg/L
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Stays near Spearhead Lake
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Watch Spearhead Lake’s letter
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Why Spearhead Lake 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 Spearhead Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
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.
Spearhead Lake is a lake in Skagit County, Washington.
Source: EPA Water Quality Portal sampling records, WA Ecology, last sampled 2017-10-26. Grade methodology: LakeQuality methodology.
What Spearhead Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.8 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Spearhead Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 10.8 ft. Phosphorus 14 µg/L. TSI 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.8 ft | Not graded |
| Phosphorus | 14 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Spearhead Lake
Nearby Lakes in Skagit County
Frequently asked questions about Spearhead Lake
Where is Spearhead Lake?
- Spearhead Lake is a lake in Skagit County, Washington. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Spearhead Lake?
- Spearhead Lake in Skagit County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.8 ft visibility. Phosphorus: 14 µg/L.
Is Spearhead Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Spearhead Lake across LakeQuality
16.4 mi away · 120 ft
21.2 mi away · recorded at 99°F
Species activity outlook by water temperature and season
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Where this data comes from
9 measurements from 2 monitoring stations, 2017. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Sauk-Suiattle Indian Tribe (Tribal)
SAUKSUIATTLE9 samples · 2017
Analytical methods
- 4500 P F ~ Phosphorus in Water by Colorimetry Automated Ascorbic Acid Method
Monitoring station identifiers (2)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.