Sylvan Lake
Noble County, Indiana653 acresView mapDirections
IDEM publishes the water-quality measurements for Sylvan Lake. Here is what has been measured.
- Impaired · PCBs
- 30 ft max depth
- Limited data
Sylvan Lake in Noble County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 112.2 µg/L. Chlorophyll-a (algae): 55.5 µg/L. Maximum depth: 29.9 ft. Surface area: 653 acres.
Sylvan Lake is a 653-acre lake in Noble County, Indiana with a maximum depth of 30 feet (14-foot average).
Source: EPA Water Quality Portal sampling records, IDEM, last sampled 2026-09-07. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Sylvan Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pCBs. Check local advisories before you swim.
Whether Sylvan Lake is safe to swim in today is a call for the Indiana Department of Environmental Management and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sylvan Lake
These are the measurements IDEM publishes for Sylvan 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 112.2 µg/L. Chlorophyll-a 55.5 µg/L.
| 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 | 112µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 55.5µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
Ask about Sylvan Lake
Answers come straight from the public measurements and survey records on this page.
→ Sylvan Lake water level: the live USGS gauge reading
Lake Details
Max depth
29.9 ft
Average depth
14.1 ft
Surface area
653 acres
Shoreline
15 mi
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Fishing Sylvan Lake
EPA Impairment Status
Sylvan Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit INJ01P1248_00 · Official waterbody report
Nearby Lakes in Noble County
Frequently asked questions about Sylvan Lake
Where is Sylvan Lake?
- Sylvan Lake is a lake in Noble County, Indiana. Its water-quality measurements are published by IDEM and shown on this page as reported.
What is the water quality of Sylvan Lake?
- Sylvan Lake in Noble County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 112.2 µg/L. Chlorophyll-a (algae): 55.5 µg/L. Maximum depth: 29.9 ft. Surface area: 653 acres.
Is Sylvan Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sylvan Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pCBs. Check local advisories before you swim.
How deep is Sylvan Lake?
- Sylvan Lake has a maximum depth of 29.9 feet and an average depth of 14.1 feet. The lake covers 653 acres.
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Where this data comes from
Measurements for Sylvan Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database