Riddles Lake
Riddles Lake in St. Joseph County, Indiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 78 acres.
- Area
- 78 acres
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Why Riddles Lake 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 Riddles Lake, 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 IDEM and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Riddles Lake is a 78-acre lake in St. Joseph County, Indiana.
Source: EPA Water Quality Portal sampling records, IDEM, 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 Riddles Lake
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 Riddles Lake
Compare lakeside cabins, hotels, and vacation rentals near Riddles Lake in St. Joseph County, Indiana — 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 Riddles Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 78 acres |
No bathymetric survey has been published for Riddles Lake, so its depth is not documented here.
Fishing Riddles Lake
Nearby Lakes in St. Joseph County
Frequently asked questions about Riddles Lake
Where is Riddles Lake?
- Riddles Lake is a lake in St. Joseph County, Indiana. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Riddles Lake?
- Riddles Lake in St. Joseph County, Indiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 78 acres.
Is Riddles Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Riddles Lake 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 Riddles Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.