Hamilton Lake
Caldwell County, WisconsinEutrophic
Hamilton Lake is a 76-acre productive, nutrient-rich eutrophic lake in Caldwell County, MO. Water quality is graded D based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-28. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
No clarity data. Phosphorus level: 64.2 µg/L. Chlorophyll-a: 20.7 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 64.2 µg/L | D |
| Chlorophyll-a (Algae) | 20.7 µg/L | D |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 76 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Caldwell County
Cleaner Lakes Within 30 Miles
Hamilton Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Caldwell County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
St. Louis city County · Clarity: 2.3 ft
Shelby County · Clarity: 3.2 ft
Macon County · Clarity: 1.8 ft
Harrison County · Clarity: 1.7 ft
Stone County · Clarity: 2.3 ft
Knox County · Clarity: 2.1 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Hamilton Lake is a man-made reservoir impounded by the Hamilton City Water Plant Dam (completed 1954), built primarily for water supply on the TOM CREEK; earth-type dam, 40 ft tall and 1,300 ft long.
- Surface area
- 76 ac
- Normal storage
- 999 ac-ft
- Max storage
- 1,013 ac-ft
- Drainage area
- 2.01 sq mi
- Hazard class
- High
- Owner
- CITY OF HAMILTON
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID MO10261 · Operator website · Matched by proximity (0.17 km)
EPA Impairment Status
Hamilton 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_7124.00 · Official waterbody report
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: 2024-08-28
Monitoring stations: 1