Guilford Lake
Chenango County, New York74 acresView 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)
- 27 ft max depth
- Limited data
Guilford Lake in Chenango County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.8 ft visibility. Surface area: 74 acres.
- Clarity
- 13.8 ft
- Max depth
- ~27 ft est.
- Area
- 74 acres
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Watch Guilford Lake’s letter
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Why Guilford Lake has no grade
Guilford 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, Guilford Lake is Not Rated — not an F. Its 13.8-foot median from 8 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.
Guilford Lake is a 74-acre lake in Chenango County, New York with an estimated average depth of about 27 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-27. Grade methodology: LakeQuality methodology.
What Guilford Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13.8 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Guilford Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for Guilford Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 13.8 ft. TSI 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~27 ft est. |
| Average Depth | ~18 ft est. |
| Surface Area | 74 acres |
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 Guilford 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 Guilford Lake
Reservoir Info (USACE NID)
Guilford Lake is a man-made reservoir impounded by the Guilford Lake Dam (completed 1827), built primarily for water supply on the GUILFORD CREEK; earth-type dam, 15 ft tall and 62 ft long.
- Surface area
- 74 ac
- Normal storage
- 390 ac-ft
- Max storage
- 560 ac-ft
- Drainage area
- 2.23 sq mi
- Hazard class
- High
- Owner
- TOWN OF GUILFORD
Source: USACE National Inventory of Dams, NID ID NY01483 · Operator website
EPA Impairment Status
Guilford 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 NY0601-0012 · Official waterbody report
Nearby Lakes in Chenango County
Frequently asked questions about Guilford Lake
Where is Guilford Lake?
- Guilford Lake is a lake in Chenango 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 Guilford Lake?
- Guilford Lake in Chenango County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.8 ft visibility. Surface area: 74 acres.
Is Guilford Lake safe to swim in?
- The letter is not a swimming clearance. Guilford Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Guilford Lake?
- No published bathymetric survey covers Guilford Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 27 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 74 acres.
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Where this data comes from
8 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
NALMS8 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
Lake size & watershed from HydroLAKES (HydroSHEDS)