Lake
Thurston County, WashingtonView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Oxygen depletion (low DO)
- Limited data
Lake in Thurston County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 32 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
- Phosphorus
- 32 µg/L
- Chlorophyll-a
- 2.7 µg/L
- Trend
- ↑ Improving
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Stays near Lake
Compare lakeside cabins, hotels, and vacation rentals near Lake in Thurston 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.
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Watch Lake’s letter
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Why 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 Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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 is a lake in Thurston County, Washington. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, WA Ecology, last sampled 2015-06-25. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedBacteria advisory
The letter is not a swimming clearance. Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO), pathogens (E. coli, fecal). Check local advisories before you swim.
Water quality measurements for Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 32 µg/L. Chlorophyll-a 2.7 µg/L. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 32 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.7 µg/L | Not graded |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -2 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.26 µg/L/yr | 4 |
EPA Impairment Status
Lake is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit WA47122A9E0_01_01 · Official waterbody report · Matched by proximity (1.78 km)
Graded lakes near Lake
Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Thurston County
Frequently asked questions about Lake
Where is Lake?
- Lake is a lake in Thurston County, Washington. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Lake?
- Lake in Thurston County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 32 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
Is Lake safe to swim in?
- The letter is not a swimming clearance. Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO), pathogens (E. coli, fecal). Check local advisories before you swim.
Explore Lake across LakeQuality
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Where this data comes from
40 measurements from 1 monitoring station, 2012–2015. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Thurston County Health Department
THURSTONCOUNTY40 samples · 2012–2015
Analytical methods
- External files contain methodological data
- Fluorometric determination of chlorophyll a in presence of pheophytin
Monitoring station identifiers (1)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database