Jette Lake
Lake County, MontanaView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Jette Lake in Lake County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 15.8 ft visibility.
- Clarity
- 15.8 ft
- Trend
- ↑ Improving
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Stays near Jette Lake
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Watch Jette Lake’s letter
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Why Jette Lake has no grade
Jette Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Jette Lake is Not Rated — not an F. Its 15.8-foot median from 2 readings collected 2020–2021 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by Montana DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Jette Lake is a lake in Lake County, Montana. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled 2021-07-19. Grade methodology: LakeQuality methodology.
What Jette Lake is good for
From access and monitoring records, not editorial picks.
- Clear water15.8 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 Jette Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 15.8 ft down. TSI 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 15.8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Jette Lake
Water Quality Trend: ↑ Improving
Based on 12 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.1 m/yr | 2 |
| Phosphorus | ↑ Improving | -1.48 µg/L/yr | 11 |
| Chlorophyll-a | ↑ Improving | -0.45 µg/L/yr | 12 |
Graded lakes near Jette Lake
Jette Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Lake County
Frequently asked questions about Jette Lake
Where is Jette Lake?
- Jette Lake is a lake in Lake County, Montana. 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 Jette Lake?
- Jette Lake in Lake County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 15.8 ft visibility.
Is Jette Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Jette Lake across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS2 samples · 2020–2021
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.