Swan Lake Max Depth
Carroll County, WisconsinHypereutrophic
Swan Lake Max Depth is a 130-acre highly nutrient-loaded hypereutrophic lake in Carroll County, IA. Water quality is graded F based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-04. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.4 ft of visibility. Chlorophyll-a: 74 µg/L. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.4 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 74 µg/L | F |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 130 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Carroll County
Cleaner Lakes Within 30 Miles
Swan Lake Max Depth holds Grade F. 3 nearby lakes hold higher grades.
- CArrowhead LakeSac County · 20.9 mi · Two grade letters higher (F → C)
- DYellow Smoke LakeCrawford County · 24.9 mi · Higher grade (F → D)
- DSpringbrook LakeGuthrie County · 26.4 mi · Higher grade (F → D)
Nearby Lakes in Carroll County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Swan Lake Max Depth is a man-made reservoir impounded by the Swan Lake Dam (completed 1935), built primarily for fish and wildlife pond on the Trib to Middle Raccoon; earth-type dam, 10 ft tall and 900 ft long.
- Surface area
- 130 ac
- Normal storage
- 440 ac-ft
- Max storage
- 600 ac-ft
- Drainage area
- 1.4 sq mi
- Hazard class
- Low
- Owner
- Iowa Department of Natural Resources
Source: USACE National Inventory of Dams, NID ID IA04222 · Operator website · Matched by proximity (0.46 km)
EPA Impairment Status
Swan Lake Max Depth is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IA 04-RAC-1199 · Official waterbody report · Matched by proximity (0.44 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: 2024-09-04
Monitoring stations: 1