Phillips Lake
Boone County, WisconsinEutrophic
Phillips Lake is a 33-acre productive, nutrient-rich eutrophic lake in Boone County, MO. Water quality is graded C based on 3 sampling years through 2024. Compared to the 11 other monitored lakes in Boone County, Phillips Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-11-15. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 2.8 ft of visibility. Phosphorus level: 35.5 µg/L. Chlorophyll-a: 8.8 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.8 ft | F |
| Phosphorus | 35.5 µg/L | C |
| Chlorophyll-a (Algae) | 8.8 µg/L | B |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 33 acres |
Location
County Ranking
Ranked #4 of 12 lakes in Boone County
Cleaner Lakes Within 30 Miles
Phillips Lake holds Grade C. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Boone County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Warren County · Clarity: 3.8 ft
Ralls County · Clarity: 3.7 ft
Warren County · Clarity: 3.3 ft
Platte County · Clarity: 4.7 ft
Barry County · Clarity: 5 ft
Phelps County · Clarity: 4.9 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Phillips Lake is a man-made reservoir impounded by the Philips Park Lake Dam (completed 1965), built primarily for recreation on the TR-CLEAR CREEK; earth-type dam, 46 ft tall and 985 ft long.
- Surface area
- 33 ac
- Normal storage
- 653 ac-ft
- Max storage
- 653 ac-ft
- Drainage area
- 0.56 sq mi
- Hazard class
- High
- Owner
- THE CITY OF COLUMBIA
Source: USACE National Inventory of Dams, NID ID MO10019 · Operator website · Matched by proximity (0.08 km)
EPA Impairment Status
Phillips Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7628.00 · Official waterbody report · Matched by proximity (0.21 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: 2024-11-15
Monitoring stations: 1