Island Park Lake is a mesotrophic lake in Fremont County, Idaho. Water quality is graded C based on 3 sampling years through 2024. Compared to the 5 other monitored lakes in Fremont County, Island Park Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Idaho DNR, last sampled 2024-05-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 9.8 ft. Phosphorus level: 24 µg/L. Chlorophyll-a: 11.8 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.8 ft | C |
| Phosphorus | 24 µg/L | B |
| Chlorophyll-a (Algae) | 11.8 µg/L | C |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Island Park Lake
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Fishing Island Park Lake
Location
County Ranking
Ranked #3 of 6 lakes in Fremont County
Nearby Lakes in Fremont County
Explore Island Park Lake across LakeGrade
More Idaho Lake Rankings
Other Grade C Lakes in Idaho
Caribou County · Clarity: 10.1 ft
Power County · Fair
Power County · Fair
Power County · Fair
Power County · Fair
Power County · Fair
Mesotrophic 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: 2024-05-21
Monitoring stations: 1