Lake: Offutt Lake is a productive, nutrient-rich eutrophic lake in Thurston County, Washington. Water quality is graded B based on 2 sampling years through 2025. Compared to the 18 other monitored lakes in Thurston County, Lake: Offutt Lake ranks #16 for water quality.
Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2025-10-22. Grade methodology: LakeGrade methodology.
Watch Lake: Offutt Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
No clarity data. Phosphorus level: 23 µg/L. Chlorophyll-a: 11 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 23 µg/L | B |
| Chlorophyll-a (Algae) | 11 µg/L | C |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake: Offutt Lake
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Fishing Lake: Offutt Lake
Location
County Ranking
Ranked #16 of 19 lakes in Thurston County
Cleaner Lakes Within 30 Miles
Lake: Offutt Lake holds Grade B. 3 nearby lakes hold higher grades.
- ALake: Deep LakeThurston County · 4 mi · Higher grade (B → A)
- ALake: Ward LakeThurston County · 6.8 mi · Higher grade (B → A)
- ALake: Hicks LakeThurston County · 7.5 mi · Higher grade (B → A)
Nearby Lakes in Thurston County
Explore Lake: Offutt Lake across LakeGrade
More Washington Lake Rankings
Other Grade B Lakes in Washington
Eutrophic Lakes in Washington
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-22
Monitoring stations: 1