Ottawa R Lake
Allen County, OhioView mapDirections
Ohio EPA publishes the water-quality measurements for Ottawa R Lake. Here is what has been measured.
- Mesotrophic
- Limited data
Ottawa R Lake in Allen County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 207 µg/L. Chlorophyll-a (algae): 2.1 µg/L.
Ottawa R Lake is a mesotrophic lake in Allen County, Ohio. Compared to the 6 other monitored lakes in Allen County, Ottawa R Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2024-09-12. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Ottawa R Lake is safe to swim in today is a call for the Ohio Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Ottawa R Lake
These are the measurements Ohio EPA publishes for Ottawa R Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 207 µg/L. Chlorophyll-a 2.1 µg/L. TSI 60.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 207µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 2.1µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 60 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Fishing Ottawa R Lake
Nearby Lakes in Allen County
Frequently asked questions about Ottawa R Lake
Where is Ottawa R Lake?
- Ottawa R Lake is a lake in Allen County, Ohio. Its water-quality measurements are published by Ohio EPA and shown on this page as reported.
What is the water quality of Ottawa R Lake?
- Ottawa R Lake in Allen County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 207 µg/L. Chlorophyll-a (algae): 2.1 µg/L.
Is Ottawa R Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Ottawa R Lake across LakeQuality
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Other Lakes in Ohio
Mesotrophic Lakes in Ohio
Where this data comes from
14 measurements from 2 monitoring stations, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Division of Surface water (Ohio)
21OHIO_WQX14 samples · 2024
Analytical methods
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (2)
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.