Irondequoit Bay Lake
Monroe County, New YorkView mapDirections
NY DEC publishes the water-quality measurements for Irondequoit Bay Lake. Here is what has been measured.
- Eutrophic
- Impaired · Pesticides
- 39 ft max depth
- Limited data
Irondequoit Bay Lake in Monroe County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 7.1 ft visibility. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 9.8 µg/L.
Irondequoit Bay Lake is a productive, nutrient-rich eutrophic lake in Monroe County, New York with an estimated average depth of about 39 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2023-11-01. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are 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.
Whether Irondequoit Bay Lake is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Irondequoit Bay Lake
These are the measurements NY DEC publishes for Irondequoit Bay Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7.1 ft. Phosphorus 27.5 µg/L. Chlorophyll-a 9.8 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 27.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 9.8µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Irondequoit Bay Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max 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
Watershed (drainage) area
153 sq mi
HydroLAKES / HydroSHEDS
Surface area
1,572 acres
HydroLAKES / HydroSHEDS
Shoreline
13.6 mi
HydroLAKES / HydroSHEDS
Elevation
240 ft
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.
Stays via Stay22
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 readings cover nutrients and algae, not lodging. Cabins and rentals around Irondequoit Bay Lake are listed below.
Top-rated places to stay near Irondequoit Bay Lake
Prices for Oct 23–25, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at New York’s top lakes →
Follow Irondequoit Bay Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
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
Designated uses not supporting: Aquatic life.
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.
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. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Irondequoit Bay Lake?
- Irondequoit Bay Lake in Monroe County, New York has water-quality measurements published by NY DEC, shown here as reported. 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?
- Nutrient and algae readings are 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
More lakes in New York
Other Lakes in New York
Eutrophic Lakes in New York
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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from 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)