Greenfield Lake
Greene County, WisconsinLimited DataEutrophic
Greenfield Lake is a 52-acre productive, nutrient-rich eutrophic lake in Greene County, IL. Water quality is graded D based on 1 sampling years through 2021.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2021-10-19. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
No clarity data. Phosphorus level: 66 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 66 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 52 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Greene County
Nearby Lakes in Greene County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Greenfield Lake is a man-made reservoir impounded by the Greenfield City Dam (completed 1959), built primarily for water supply on the TRIB RUBICON CREEK; earth-type dam, 33 ft tall and 650 ft long.
- Surface area
- 52 ac
- Normal storage
- 564 ac-ft
- Max storage
- 899 ac-ft
- Drainage area
- 1.1 sq mi
- Hazard class
- Significant
- Owner
- CITY OF GREENFIELD
Source: USACE National Inventory of Dams, NID ID IL00761 · Operator website · Matched by proximity (0.31 km)
EPA Impairment Status
Greenfield Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit IL_RDZF · 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: 2021-10-19
Monitoring stations: 2