Thread Lake Central Basin
Genesee County, WisconsinEutrophic
Thread Lake Central Basin is a 80-acre productive, nutrient-rich eutrophic lake in Genesee County, MI. Water quality is graded C based on 2 sampling years through 2022. Compared to the 8 other monitored lakes in Genesee County, Thread Lake Central Basin ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-09-17. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 1.8 ft of visibility. Chlorophyll-a: 7.6 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 7.6 µg/L | B |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 80 acres |
Location
County Ranking
Ranked #7 of 9 lakes in Genesee County
Nearby Lakes in Genesee County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Cass County · Clarity: 7 ft
Leelanau County · Clarity: 9.5 ft
Iosco County · Clarity: 5.5 ft
Muskegon County · Clarity: 6.8 ft
Gladwin County · Clarity: 9 ft
Montmorency County · Clarity: 9 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Thread Lake Central Basin is a man-made reservoir impounded by the Thread Lake Dam (completed 1973), built primarily for recreation on the Thread Creek; gravity-type dam, 9 ft tall and 293 ft long.
- Surface area
- 80 ac
- Normal storage
- 320 ac-ft
- Max storage
- 1,250 ac-ft
- Drainage area
- 57.9 sq mi
- Hazard class
- Significant
- Owner
- City of Flint
Source: USACE National Inventory of Dams, NID ID MI00063 · Operator website · Matched by proximity (0.57 km)
EPA Impairment Status
Thread Lake Central Basin is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040802040306-03 · Official waterbody report · Matched by proximity (0.36 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: 2022-09-17
Monitoring stations: 1