South Lake
Herkimer County, WisconsinLimited DataOligotrophic
South Lake is a 499-acre cold, clear oligotrophic lake in Herkimer County, NY. Water quality is graded A based on 1 sampling years through 2023. Compared to the 6 other monitored lakes in Herkimer County, South Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-07-06. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Phosphorus level: 4 µg/L. Trophic State Index: 24.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 4 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 24 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 499 acres |
Location
County Ranking
Ranked #1 of 7 lakes in Herkimer County
Nearby Lakes in Herkimer County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Oligotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
South Lake is a man-made reservoir impounded by the South Lake Dam (completed 1901), built primarily for recreation on the SOUTH BRANCH BLACK RIVER; earth-type dam, 30 ft tall and 380 ft long.
- Surface area
- 499 ac
- Normal storage
- 4,840 ac-ft
- Max storage
- 5,480 ac-ft
- Hazard class
- High
- Owner
- New York State Canal Corporation
Source: USACE National Inventory of Dams, NID ID NY00317 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-07-06
Monitoring stations: 1