Holiday Shores Lake
Madison County, WisconsinHypereutrophic
Holiday Shores Lake is a 345-acre highly nutrient-loaded hypereutrophic lake in Madison County, IL. Water quality is graded F based on 2 sampling years through 2020. Compared to the 1 other monitored lakes in Madison County, Holiday Shores Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-11-17. 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 1.7 ft of visibility. Phosphorus level: 126.5 µg/L. Trophic State Index: 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.7 ft | F |
| Phosphorus | 126.5 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 345 acres |
Location
County Ranking
Ranked #1 of 2 lakes in Madison County
Nearby Lakes in Madison County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Holiday Shores Lake is a man-made reservoir impounded by the Holiday Shores Lake Dam (completed 1965), built primarily for recreation on the JOULTERS CREEK; earth-type dam, 47 ft tall and 960 ft long.
- Surface area
- 345 ac
- Normal storage
- 4,605 ac-ft
- Max storage
- 6,610 ac-ft
- Drainage area
- 6.3 sq mi
- Hazard class
- Significant
- Owner
- HOLISHOR ASSOCIATION, INC.
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID IL00190 · Operator website
EPA Impairment Status
Holiday Shores 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_RJN · 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: 2020-11-17
Monitoring stations: 3