Soldiers Meadow Reservoir West Arm
Nez Perce County, Idaho150 acresView mapDirections
Idaho DEQ publishes the water-quality measurements for Soldiers Meadow Reservoir West Arm. Here is what has been measured.
- Limited data
Soldiers Meadow Reservoir West Arm in Nez Perce County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Water clarity: 3.6 ft visibility. Phosphorus: 56.5 µg/L. Chlorophyll-a (algae): 28.5 µg/L. Surface area: 150 acres.
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. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Soldiers Meadow Reservoir West Arm is safe to swim in today is a call for the Idaho Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Soldiers Meadow Reservoir West Arm
These are the measurements Idaho DEQ publishes for Soldiers Meadow Reservoir West Arm, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 3.6 ft. Phosphorus 56.5 µg/L. Chlorophyll-a 28.5 µg/L. TSI 61.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 56.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 28.5µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 61 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Soldiers Meadow Reservoir West Arm
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
150 acres
No bathymetric survey has been published for Soldiers Meadow Reservoir West Arm, so its depth is not documented here.
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Fishing Soldiers Meadow Reservoir West Arm
Water quality readings over time
3 seasons of samples on record (2012–2015). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving2 years
Phosphorus
Stable-0.07 µg/L/yr3 years
Chlorophyll-a
Improving-19.4 µg/L/yr2 years
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)
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. Its water-quality measurements are published by Idaho DEQ and shown on this page as reported.
What is the water quality of Soldiers Meadow Reservoir West Arm?
- Soldiers Meadow Reservoir West Arm in Nez Perce County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.