Waha Reservoir Middle
Nez Perce County, IdahoView mapDirections
Not enough samples to grade — 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. No letter yet. Here is what we do have.
- Limited data
Waha Reservoir Middle in Nez Perce County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9.7 ft visibility. Phosphorus: 45 µg/L. Chlorophyll-a (algae): 3.9 µg/L.
- Clarity
- 9.7 ft
- Phosphorus
- 45 µg/L
- Chlorophyll-a
- 3.9 µg/L
- Trend
- ↑ Improving
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Watch Waha Reservoir Middle’s letter
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Why Waha Reservoir Middle 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 Waha Reservoir Middle, 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. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
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 IDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Waha Reservoir Middle is a lake in Nez Perce County, Idaho. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, IDEQ, last sampled 2013-09-24. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Waha Reservoir Middle
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 9.7 ft. Phosphorus 45 µg/L. Chlorophyll-a 3.9 µg/L. TSI 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.7 ft | Not graded |
| Phosphorus | 45 µg/L | Not graded |
| Chlorophyll-a (Algae) | 3.9 µg/L | Not graded |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Waha Reservoir Middle
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.1 m/yr | 2 |
| Phosphorus | ↑ Improving | -1.57 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -0.7 µg/L/yr | 2 |
Graded lakes near Waha Reservoir Middle
Waha Reservoir Middle has no grade, but these lakes within a short drive do.
Nearby Lakes in Nez Perce County
Frequently asked questions about Waha Reservoir Middle
Where is Waha Reservoir Middle?
- Waha Reservoir Middle is a lake in Nez Perce County, Idaho. 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 Waha Reservoir Middle?
- Waha Reservoir Middle in Nez Perce County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9.7 ft visibility. Phosphorus: 45 µg/L. Chlorophyll-a (algae): 3.9 µg/L.
Is Waha Reservoir Middle safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Waha Reservoir Middle across LakeQuality
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Where this data comes from
24 measurements from 1 monitoring station, 2012–2013. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Bureau of Reclamation
1119USBR_WQX24 samples · 2012–2013
Analytical methods
- Depth, Secchi disk depth
- Phosphorus by Single Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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.