Yellow Creek Lake
Kosciusko County, IndianaView 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.
- Impaired · Nutrients (phosphorus, nitrogen)
- 31 ft max depth
- Limited data
Yellow Creek Lake in Kosciusko County, Indiana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.8 ft visibility.
- Clarity
- 2.8 ft
- Max depth
- ~31 ft est.
- Trend
- ↑ Improving
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Watch Yellow Creek Lake’s letter
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Why Yellow Creek Lake has no grade
Yellow Creek 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, Yellow Creek Lake is Not Rated — not an F. Its 2.8-foot median from 11 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 IDEM and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Yellow Creek Lake is a lake in Kosciusko County, Indiana with an estimated average depth of about 31 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, IDEM, last sampled 2021-08-09. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Yellow Creek Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for Yellow Creek Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.8 ft of visibility. TSI 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~31 ft est. |
| Average Depth | ~11 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Indiana has not published bathymetry for Yellow Creek Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Yellow Creek Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.5 m/yr | 2 |
| Phosphorus | ↑ Improving | -284.9 µg/L/yr | 2 |
EPA Impairment Status
Yellow Creek Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit INB06P1078_00 · Official waterbody report · Matched by proximity (2.31 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Yellow Creek Lake under Clean Water Act (NPDES) discharge permits.
- Yellow Creek CampgroundClaypool · 0.4 mi away · NPDES IN0056456
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Kosciusko County
Frequently asked questions about Yellow Creek Lake
Where is Yellow Creek Lake?
- Yellow Creek Lake is a lake in Kosciusko County, Indiana. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Yellow Creek Lake?
- Yellow Creek Lake in Kosciusko County, Indiana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.8 ft visibility.
Is Yellow Creek Lake safe to swim in?
- The letter is not a swimming clearance. Yellow Creek Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Yellow Creek Lake?
- No published bathymetric survey covers Yellow Creek Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 31 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
11 measurements 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
NALMS11 samples · 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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)