Spanish Lake
St. Louis County, WisconsinHypereutrophic
Spanish Lake is a highly nutrient-loaded hypereutrophic lake in St. Louis County, MO. Water quality is graded F based on 3 sampling years through 2024. Compared to the 8 other monitored lakes in St. Louis County, Spanish Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-21. 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 1.6 ft of visibility. Phosphorus level: 347.8 µg/L. Chlorophyll-a: 62.6 µg/L. Trophic State Index: 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | 347.8 µg/L | F |
| Chlorophyll-a (Algae) | 62.6 µg/L | F |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Location
County Ranking
Ranked #6 of 9 lakes in St. Louis County
Cleaner Lakes Within 30 Miles
Spanish Lake holds Grade F. 4 nearby lakes hold higher grades.
- DO'Fallon Park LakeSt. Louis city County · 8.4 mi · Higher grade (F → D)
- DForest Park PondSt. Louis city County · 11.9 mi · Higher grade (F → D)
- DLafayette Park LakeSt. Louis city County · 12.8 mi · Higher grade (F → D)
- DJefferson LakeSt. Louis city County · 12 mi · Higher grade (F → D)
Nearby Lakes in St. Louis County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Jackson County · Clarity: 2 ft
St. Charles County · Clarity: 2.3 ft
St. Francois County · Clarity: 1.1 ft
Saline County · Clarity: 2.3 ft
Polk County · Clarity: 1.2 ft
Callaway County · Clarity: 1.7 ft
Hypereutrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-21
Monitoring stations: 1