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LakeQuality
B

Guilford Lake

Chenango County, WisconsinLimited DataOligotrophic

Guilford Lake is a 74-acre cold, clear oligotrophic lake in Chenango County, NY. Water quality is graded B based on 1 sampling years through 2020. Compared to the 6 other monitored lakes in Chenango County, Guilford Lake ranks #3 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-09-27. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 13.8 ft. Trophic State Index: 39.

MetricValueGrade
Water Clarity (Secchi Depth)13.8 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)39Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Surface Area74 acres

Location

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County Ranking

Ranked #3 of 7 lakes in Chenango County

Nearby Lakes in Chenango County

A
Lake Petonia
Chenango County
A
Chenango Lake
Chenango County
B
Warn Lake
Chenango County
B
Genegantslet Lake
Chenango County
D
Plymouth Reservoir
Chenango County
F
Truitt Pond
Chenango County

More Wisconsin Lake Rankings

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Top 25 by overall water quality score

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Grade A/B + low algae filter

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Panfish-rich, public access

All Wisconsin lakes

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Other Grade B Lakes in Wisconsin

E Caroga Lake

Fulton County · Clarity: 10.5 ft

Friends Lake

Warren County · Clarity: 13.8 ft

W Caroga Lake

Fulton County · Clarity: 11.3 ft

Sodus Bay Lake

Wayne County · Clarity: 8 ft

Hunt Lake

Saratoga County · Clarity: 12.3 ft

Seneca Lake

Yates County · Clarity: 10.3 ft

Oligotrophic Lakes in Wisconsin

Owasco Lake PlatformSeneca Lake PlatformBlue Mtn LakeBrant 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

Nutrients (phosphorus, nitrogen)

Source: EPA ATTAINS assessment unit NY0601-0012 · Official waterbody report

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Most recent sample: 2020-09-27

Monitoring stations: 1