Greenfield Lake is a 52-acre productive, nutrient-rich eutrophic lake in Greene County, Illinois. Water quality is graded D based on 1 sampling years through 2021. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2021-10-19. Grade methodology: LakeGrade methodology.
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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 |
| Public Access | Yes |
Where to stay near Greenfield Lake
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Fishing Greenfield Lake
Recreation & Access
Water Temperature
Greenfield Lake averages about 78°F at the surface in summer, usually warmest in Jul (about 83°F) and coldest in Apr (about 54°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 176 field readings (2014–2021) via the EPA Water Quality Portal. See the full Greenfield Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 1 lakes in Greene County
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Eutrophic Lakes in Illinois
More records, surveys & data sources
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
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Greenfield Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Greenfield Stp, City OfGreenfield · 0.3 mi away · NPDES IL0029076Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2021-10-19
Monitoring stations: 2