Timber Lake
Lake County, WisconsinLimited DataMesotrophic
Timber Lake is a mesotrophic lake in Lake County, IL. Water quality is graded B based on 1 sampling years through 2020. Compared to the 15 other monitored lakes in Lake County, Timber Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-07-20. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10.6 ft. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.6 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #3 of 16 lakes in Lake County
Nearby Lakes in Lake County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Timber Lake is a man-made reservoir impounded by the Timber Lake Dam (completed 1949), built primarily for recreation on the TRIB TOWER LAKE; earth-type dam, 20 ft tall and 320 ft long.
- Normal storage
- 240 ac-ft
- Max storage
- 292 ac-ft
- Hazard class
- Low
- Owner
- MICHAEL GRAFF
Source: USACE National Inventory of Dams, NID ID IL00632 · Operator website
EPA Impairment Status
Timber Lake 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 IL_RTZQ · Official waterbody report · Matched by proximity (0.04 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: 2020-07-20
Monitoring stations: 1