Irondequoit Bay Lake
Monroe County, New YorkView mapDirections
Nutrients and algae run above the regional average.
↓ down from C at the last regrade
- Eutrophic
- Impaired · Pesticides
- #1 of 1 in the county
- 39 ft max depth
- Limited data
Irondequoit Bay Lake in Monroe County, New York has a water quality grade of D (Nutrient-rich). Water clarity: 7.1 ft visibility. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 9.8 µg/L.
- Clarity
- 7.1 ft
- Max depth
- ~39 ft est.
- Type
- Eutrophic
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Stays near Irondequoit Bay Lake
Compare lakeside cabins, hotels, and vacation rentals near Irondequoit Bay Lake in Monroe County, New York — 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Irondequoit Bay Lake are listed below.
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Irondequoit Bay Lake is a productive, nutrient-rich eutrophic lake in Monroe County, New York with an estimated average depth of about 39 feet. Water quality is graded D based on 1 sampling years through 2023.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2023-11-01. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The D is nutrients and algae, not a swimming clearance. Irondequoit Bay Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pesticides, pCBs. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Moderate clarity, visible to about 7.1 ft. Phosphorus 27.5 µg/L. Chlorophyll-a 9.8 µg/L. TSI 51. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.1 ft | Not graded |
| Phosphorus | 27.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 9.8 µg/L | Poor |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~39 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. New York has not published bathymetry for Irondequoit Bay 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 Irondequoit Bay Lake
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
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.
County Ranking
Ranked #1 of 1 lakes in Monroe County
Nearby Lakes in Monroe County
Frequently asked questions about Irondequoit Bay Lake
Where is Irondequoit Bay Lake?
- Irondequoit Bay Lake is a lake in Monroe County, New York. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Irondequoit Bay Lake?
- Irondequoit Bay Lake in Monroe County, New York has a water quality grade of D (Nutrient-rich). Water clarity: 7.1 ft visibility. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 9.8 µg/L.
Is Irondequoit Bay Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Irondequoit Bay Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pesticides, pCBs. Check local advisories before you swim.
How deep is Irondequoit Bay Lake?
- No published bathymetric survey covers Irondequoit Bay Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 39 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Irondequoit Bay Lake across LakeQuality
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Where this data comes from
25 measurements from 2 monitoring stations, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS New York Water Science Center
USGS-NY25 samples · 2023
Analytical methods
- Secchi disk method
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
Monitoring station identifiers (2)
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)