Soldiers Meadow Reservoir West Arm
Nez Perce County, Idaho150 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Soldiers Meadow Reservoir West Arm in Nez Perce County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.6 ft visibility. Phosphorus: 56.5 µg/L. Chlorophyll-a (algae): 28.5 µg/L. Surface area: 150 acres.
- Clarity
- 3.6 ft
- Area
- 150 acres
- Phosphorus
- 56.5 µg/L
- Chlorophyll-a
- 28.5 µg/L
- Trend
- ↑ Improving
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Watch Soldiers Meadow Reservoir West Arm’s letter
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Why Soldiers Meadow Reservoir West Arm 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 Soldiers Meadow Reservoir West Arm, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). 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.
Soldiers Meadow Reservoir West Arm is a 150-acre 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 2012-07-31. 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 Soldiers Meadow Reservoir West Arm
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 3.6 ft. Phosphorus 56.5 µg/L. Chlorophyll-a 28.5 µg/L. TSI 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.6 ft | Not graded |
| Phosphorus | 56.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 28.5 µg/L | Not graded |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 150 acres |
No bathymetric survey has been published for Soldiers Meadow Reservoir West Arm, so its depth is not documented here.
Fishing Soldiers Meadow Reservoir West Arm
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.05 m/yr | 2 |
| Phosphorus | → Stable | -0.07 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -19.4 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Soldiers Meadow Reservoir West Arm is a man-made reservoir impounded by the Soldiers Meadow Dam (completed 1922), built primarily for irrigation on the Webb Creek; earth-type dam, 69 ft tall and 535 ft long.
- Surface area
- 150 ac
- Normal storage
- 2,370 ac-ft
- Max storage
- 3,195 ac-ft
- Drainage area
- 6.28 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Irrigation;Water Supply.
Source: USACE National Inventory of Dams, NID ID ID00149 · Operator website · Matched by proximity (0.55 km)
Graded lakes near Soldiers Meadow Reservoir West Arm
Soldiers Meadow Reservoir West Arm has no grade, but these lakes within a short drive do.
Nearby Lakes in Nez Perce County
Frequently asked questions about Soldiers Meadow Reservoir West Arm
Where is Soldiers Meadow Reservoir West Arm?
- Soldiers Meadow Reservoir West Arm is a lake in Nez Perce County, Idaho. 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 Soldiers Meadow Reservoir West Arm?
- Soldiers Meadow Reservoir West Arm in Nez Perce County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.6 ft visibility. Phosphorus: 56.5 µg/L. Chlorophyll-a (algae): 28.5 µg/L. Surface area: 150 acres.
Is Soldiers Meadow Reservoir West Arm safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Soldiers Meadow Reservoir West Arm across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2012. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Bureau of Reclamation
1119USBR_WQX8 samples · 2012
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.