Bass Lake
Lee County, IllinoisView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Bass Lake in Lee County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.1 ft visibility.
- Clarity
- 8.1 ft
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Stays near Bass Lake
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Watch Bass Lake’s letter
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Why Bass Lake has no grade
Bass Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Bass Lake is Not Rated — not an F. Its 8.1-foot median from 1 readings collected 2021 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. 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.
Bass Lake is a lake in Lee County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2021-07-13. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Bass Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8.1 ft. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Bass Lake
Reservoir Info (USACE NID)
Bass Lake is a man-made reservoir impounded by the Bass Lake Dam (completed 1971), built primarily for recreation on the TRIB GREEN RIVER; earth-type dam, 11 ft tall and 472 ft long.
- Normal storage
- 49 ac-ft
- Max storage
- 186 ac-ft
- Hazard class
- Low
- Owner
- WOODHAVEN ASSOCIATION
Source: USACE National Inventory of Dams, NID ID IL00500 · Operator website
Graded lakes near Bass Lake
Bass Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Lee County
Frequently asked questions about Bass Lake
Where is Bass Lake?
- Bass Lake is a lake in Lee County, Illinois. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Bass Lake?
- Bass Lake in Lee County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8.1 ft visibility.
Is Bass Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Bass Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS1 sample · 2021
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.