Tilles Park Reservoir
St. Louis County, WisconsinHypereutrophic
Tilles Park Reservoir is a highly nutrient-loaded hypereutrophic lake in St. Louis County, MO. Water quality is graded F based on 2 sampling years through 2022. Compared to the 8 other monitored lakes in St. Louis County, Tilles Park Reservoir ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-06-05. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Phosphorus level: 434.5 µg/L. Chlorophyll-a: 66.5 µg/L. Trophic State Index: 82.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 434.5 µg/L | F |
| Chlorophyll-a (Algae) | 66.5 µg/L | F |
| Trophic State Index (TSI) | 82 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Location
County Ranking
Ranked #9 of 9 lakes in St. Louis County
Cleaner Lakes Within 30 Miles
Tilles Park Reservoir holds Grade F. 5 nearby lakes hold higher grades.
- DBoathouse LakeSt. Louis city County · 6.7 mi · Higher grade (F → D)
- DO'Fallon Park LakeSt. Louis city County · 8.7 mi · Higher grade (F → D)
- DForest Park PondSt. Louis city County · 4.4 mi · Higher grade (F → D)
- DSimpson Park LakeSt. Louis County · 7 mi · Higher grade (F → D)
- DSimpson Park LakeSt. Louis County · 7.3 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: 2022-06-05
Monitoring stations: 1