Irondequoit Bay Lake is a productive, nutrient-rich eutrophic lake in Monroe County, New York. Water quality is graded C based on 3 sampling years through 2023. The lake supports 1 documented fish species including Walleye. Compared to the 4 other monitored lakes in Monroe County, Irondequoit Bay Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2023-11-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 7 ft. Phosphorus level: 27.5 µg/L. Chlorophyll-a: 12.9 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | C |
| Phosphorus | 27.5 µg/L | B |
| Chlorophyll-a (Algae) | 12.9 µg/L | C |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Irondequoit Bay Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Irondequoit Bay Lake
Location
County Ranking
Ranked #2 of 5 lakes in Monroe County
Cleaner Lakes Within 30 Miles
Irondequoit Bay Lake holds Grade C. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Monroe County
Explore Irondequoit Bay Lake across LakeGrade
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Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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Other Grade C Lakes in New York
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More records, surveys & data sources
EPA Impairment Status
Irondequoit Bay Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit NY0302-0001 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Irondequoit Bay Lake under Clean Water Act (NPDES) discharge permits.
- Phillis PropertyWebster · 3.7 mi away · NPDES NY0245518
- John B GabrieleWebster · 4.2 mi away · NPDES NY0272019
- Nicholas ResidenceRochester · 4.5 mi away · NPDES NY0246816
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-11-01
Monitoring stations: 1