Lake Thunderbird
Lake Thunderbird in Putnam County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 107 acres.
- Area
- 107 acres
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Why Lake Thunderbird has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Thunderbird, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Illinois EPA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Thunderbird is a 107-acre lake in Putnam County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Thunderbird
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Lake Thunderbird
Compare lakeside cabins, hotels, and vacation rentals near Lake Thunderbird in Putnam County, Illinois — 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.
Top-rated places to stay near Lake Thunderbird
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 107 acres |
No bathymetric survey has been published for Lake Thunderbird, so its depth is not documented here.
Fishing Lake Thunderbird
Nearby Lakes in Putnam County
Frequently asked questions about Lake Thunderbird
Where is Lake Thunderbird?
- Lake Thunderbird is a lake in Putnam County, Illinois. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Thunderbird?
- Lake Thunderbird in Putnam County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 107 acres.
Is Lake Thunderbird safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Thunderbird is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Lake Thunderbird come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.