George Lake
Rock Island County, WisconsinEutrophic
George Lake is a 167-acre productive, nutrient-rich eutrophic lake in Rock Island County, IL. Water quality is graded C based on 2 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
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.2 ft. Phosphorus level: 22.5 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.2 ft | D |
| Phosphorus | 22.5 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 167 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Rock Island County
Nearby Lakes in Rock Island County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Cook County · Clarity: 9 ft
Cook County · Clarity: 8.5 ft
Williamson County · Clarity: 3.2 ft
Johnson County · Clarity: 4.5 ft
Gallatin County · Clarity: 3.9 ft
Cook County · Clarity: 5.4 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
George Lake is a man-made reservoir impounded by the Lake George Dam (completed 1962), built primarily for recreation on the BIG BRANCH CREEK; earth-type dam, 78 ft tall and 1,090 ft long.
- Surface area
- 167 ac
- Normal storage
- 4,014 ac-ft
- Max storage
- 6,355 ac-ft
- Drainage area
- 7.27 sq mi
- Hazard class
- High
- Owner
- ROCK ISLAND COUNTY FOREST PRESERVE DIST.
Source: USACE National Inventory of Dams, NID ID IL00136 · Operator website
EPA Impairment Status
George 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_RML · Official waterbody report · Matched by proximity (0.28 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: 2021-10-19
Monitoring stations: 3