Timnath Reservoir is a productive, nutrient-rich eutrophic lake in Larimer County, Colorado. Water quality is graded D based on 1 sampling years through 2021. Compared to the 6 other monitored lakes in Larimer County, Timnath Reservoir ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Colorado DNR, last sampled 2021-07-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 5.6 ft. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.6 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Timnath Reservoir
Location
County Ranking
Ranked #7 of 7 lakes in Larimer County
Nearby Lakes in Larimer County
Explore Timnath Reservoir across LakeGrade
More Colorado Lake Rankings
Other Grade D Lakes in Colorado
Eutrophic Lakes in Colorado
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: 2021-07-14
Monitoring stations: 1