Conesus Lake
Livingston County, New YorkView 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)
- 65 ft max depth
- Limited data
Conesus Lake in Livingston County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.7 ft visibility.
- Clarity
- 10.7 ft
- Max depth
- ~65 ft est.
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Watch Conesus Lake’s letter
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Why Conesus Lake has no grade
Conesus 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, Conesus Lake is Not Rated — not an F. Its 10.7-foot median from 16 readings collected 2020 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 NYSDEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Conesus Lake is a lake in Livingston County, New York with an estimated average depth of about 65 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-28. Grade methodology: LakeQuality methodology.
What Conesus Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.7 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Conesus Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
Water quality measurements for Conesus Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 10.7 ft. TSI 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.7 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Current Conditions
USGS snapshot Sep 7, 2026, 3:45 PM from gauge 04227980 (CONESUS LAKE NEAR LAKEVILLE NY). Station page ↗ — a live reading replaces this snapshot when the gauge responds. Missing live data is not an all-clear.
→ Conesus Lake water level: the live USGS gauge reading
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~65 ft est. |
| Average Depth | ~58 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 Conesus 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 Conesus Lake
EPA Impairment Status
Conesus Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY0402-0004 · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Conesus Lake under Clean Water Act (NPDES) discharge permits.
- Cambier PropertyConesus · 1.7 mi away · NPDES NY0245747
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 Livingston County
Frequently asked questions about Conesus Lake
Where is Conesus Lake?
- Conesus Lake is a lake in Livingston County, New York. 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 Conesus Lake?
- Conesus Lake in Livingston County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.7 ft visibility.
Is Conesus Lake safe to swim in?
- The letter is not a swimming clearance. Conesus Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
How deep is Conesus Lake?
- No published bathymetric survey covers Conesus Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 65 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
What is the water level at Conesus Lake?
- The USGS snapshot on this page for Conesus Lake is 817.86 ft of water-surface elevation, recorded Sep 7, 2026, 3:45 PM at gauge 04227980. Current Conditions hydrates a live NWIS reading from that same station when the gauge responds. A missed live fetch is not an all-clear.
Explore Conesus Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
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Where this data comes from
16 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS16 samples · 2020
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)