Clearwater Lake Deep
Missoula 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
Clearwater Lake Deep in Missoula County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 28.6 ft visibility.
- Clarity
- 28.6 ft
- Trend
- → Stable
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Stays near Clearwater Lake Deep
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Watch Clearwater Lake Deep’s letter
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Why Clearwater Lake Deep has no grade
Clearwater Lake Deep 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, Clearwater Lake Deep is Not Rated — not an F. Its 28.6-foot median from 51 readings collected 2013–2019 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.
Clearwater Lake Deep is a lake in Missoula County, Montana.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled 2019-08-28. Grade methodology: LakeQuality methodology.
What Clearwater Lake Deep is good for
From access and monitoring records, not editorial picks.
- Clear water28.6 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 Clearwater Lake Deep
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 28.6 ft down. TSI 29.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 28.6 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 29 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fishing Clearwater Lake Deep
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.012 m/yr | 7 |
Graded lakes near Clearwater Lake Deep
Clearwater Lake Deep has no grade, but these lakes within a short drive do.
Nearby Lakes in Missoula County
Frequently asked questions about Clearwater Lake Deep
Where is Clearwater Lake Deep?
- Clearwater Lake Deep is a lake in Missoula County, Montana. 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 Clearwater Lake Deep?
- Clearwater Lake Deep in Missoula County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 28.6 ft visibility.
Is Clearwater Lake Deep safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Clearwater Lake Deep?
- The available depth estimate for Clearwater Lake Deep is shallower than its measured water clarity, which cannot be right, so no depth is shown.
Explore Clearwater Lake Deep across LakeQuality
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Where this data comes from
51 measurements from 1 monitoring station, 2013–2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Montana Volunteer Water Quality Monitoring
MTVOLWQM_WQX51 samples · 2013–2019
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
Lake size & watershed from HydroLAKES (HydroSHEDS)