Upper Little York Lake
Cortland County, WisconsinLimited DataMesotrophic
Upper Little York Lake is a 150-acre mesotrophic lake in Cortland County, NY. Water quality is graded B based on 1 sampling years through 2020. Compared to the 3 other monitored lakes in Cortland County, Upper Little York Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-09-20. 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 11 ft. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 150 acres |
Location
County Ranking
Ranked #2 of 4 lakes in Cortland County
Nearby Lakes in Cortland County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Upper Little York Lake is a man-made reservoir impounded by the Little York Dam (completed 2015), built primarily for recreation on the WEST BR TIOUGHNIOGA RIVER; concrete-type dam, 7 ft tall and 250 ft long.
- Surface area
- 150 ac
- Normal storage
- 532 ac-ft
- Max storage
- 819 ac-ft
- Drainage area
- 32.6 sq mi
- Hazard class
- Significant
- Owner
- CORTLAND COUNTY
Source: USACE National Inventory of Dams, NID ID NY01023 · Operator website
EPA Impairment Status
Upper Little York 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 NY0602-0017 · Official waterbody report · Matched by proximity (0.51 km)
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: 2020-09-20
Monitoring stations: 1