American Falls R-Little Hole Draw Lake
Power County, IdahoView mapDirections
Nutrients and algae run above the regional average.
↓ down from C at the last regrade
- Eutrophic
- Impaired · Algal growth
- #5 of 6 in the county
- Limited data
American Falls R-Little Hole Draw Lake in Power County, Idaho has a water quality grade of D (Nutrient-rich). Phosphorus: 61 µg/L. Chlorophyll-a (algae): 13.1 µg/L.
- Type
- Eutrophic
- Phosphorus
- 61 µg/L
- Chlorophyll-a
- 13.1 µg/L
- Trend
- → Stable
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Compare lakeside cabins, hotels, and vacation rentals near American Falls R-Little Hole Draw Lake in Power County, Idaho — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around American Falls R-Little Hole Draw Lake are listed below.
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American Falls R-Little Hole Draw Lake is a productive, nutrient-rich eutrophic lake in Power County, Idaho. Water quality is graded D based on 2 sampling years through 2017. Phosphorus level is improving over recent sampling years. Compared to the 5 other monitored lakes in Power County, American Falls R-Little Hole Draw Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, IDEQ, last sampled 2017-09-27. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The D is nutrients and algae, not a swimming clearance. American Falls R-Little Hole Draw Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), sediment / turbidity. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 61 µg/L. Chlorophyll-a 13.1 µg/L. TSI 60. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 61 µg/L | Fair |
| Chlorophyll-a (Algae) | 13.1 µg/L | Poor |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing American Falls R-Little Hole Draw Lake
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -6.43 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +4.99 µg/L/yr | 4 |
EPA Impairment Status
American Falls R-Little Hole Draw Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit ID17040206SK001L_0L · Official waterbody report · Matched by proximity (1.64 km)
County Ranking
Ranked #5 of 6 lakes in Power County
Nearby Lakes in Power County
Frequently asked questions about American Falls R-Little Hole Draw Lake
Where is American Falls R-Little Hole Draw Lake?
- American Falls R-Little Hole Draw Lake is a lake in Power County, Idaho. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for American Falls R-Little Hole Draw Lake?
- American Falls R-Little Hole Draw Lake in Power County, Idaho has a water quality grade of D (Nutrient-rich). Phosphorus: 61 µg/L. Chlorophyll-a (algae): 13.1 µg/L.
Is American Falls R-Little Hole Draw Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. American Falls R-Little Hole Draw Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), sediment / turbidity. Check local advisories before you swim.
Explore American Falls R-Little Hole Draw Lake across LakeQuality
2 thermal springs within 15.9 mi, nearest Indian Springs
Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
26 measurements from 1 monitoring station, 2012–2017. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Bureau of Reclamation
1119USBR_WQX26 samples · 2012–2017
Analytical methods
- 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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database