Troost Lake is a highly nutrient-loaded hypereutrophic lake in Jackson County, Missouri. Water quality is graded F based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 26 other monitored lakes in Jackson County, Troost Lake ranks #19 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-14. Grade methodology: LakeGrade methodology.
Watch Troost Lake water quality
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Phosphorus level: 120.5 µg/L. Chlorophyll-a: 75.3 µg/L. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 120.5 µg/L | F |
| Chlorophyll-a (Algae) | 75.3 µg/L | F |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Troost Lake
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Fishing Troost Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +22.1 µg/L/yr | 3 |
| Chlorophyll-a | ↓ Declining | +6.96 µg/L/yr | 4 |
Water Temperature
Troost Lake averages about 82°F at the surface in summer, usually warmest in Jul (about 84°F) and coldest in May (about 72°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 30 field readings (2013–2024) via the EPA Water Quality Portal.
Location
County Ranking
Ranked #19 of 27 lakes in Jackson County
Cleaner Lakes Within 30 Miles
Troost Lake holds Grade F. 3 nearby lakes hold higher grades.
- CBlue Valley LakeJackson County · 2.7 mi · Two grade letters higher (F → C)
- DValley LakeJackson County · 0.3 mi · Higher grade (F → D)
- FLake of the Woods-KcJackson County · 6.1 mi · Higher overall water quality score
Nearby Lakes in Jackson County
Explore Troost Lake across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
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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: 2024-09-14
Monitoring stations: 1