American Falls R Lake is a productive, nutrient-rich eutrophic lake in Bannock County, Idaho. Water quality is graded B based on 2 sampling years through 2023.
Source: EPA Water Quality Portal sampling records, Idaho DNR, last sampled 2023-06-12. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
No clarity data. Phosphorus level: 42 µg/L. Chlorophyll-a: 5.7 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 42 µg/L | C |
| Chlorophyll-a (Algae) | 5.7 µg/L | B |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing American Falls R Lake
Location
County Ranking
Ranked #1 of 1 lakes in Bannock County
Cleaner Lakes Within 30 Miles
American Falls R Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Bannock County
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More Idaho Lake Rankings
Other Grade B Lakes in Idaho
Eutrophic Lakes in Idaho
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-06-12
Monitoring stations: 1