1
DO'Fallon Park Lake
St. Louis city County, Wisconsin · 4.6 mi from Koeneman Park Lake
- +Higher grade (F → D)
Cleaner Lakes Than Koeneman Park Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Koeneman Park Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. O'Fallon Park Lake (St. Louis city County, Grade D, 4.6 mi away) is the closest meaningful upgrade.
2
DBoathouse Lake
St. Louis city County, Wisconsin · 12.2 mi from Koeneman Park Lake
- +Higher grade (F → D)
- +Lower phosphorus (59.8 vs 270.8 µg/L)
3
DForest Park Pond
St. Louis city County, Wisconsin · 7 mi from Koeneman Park Lake
- +Higher grade (F → D)
- +Lower phosphorus (68.8 vs 270.8 µg/L)
4
DLafayette Park Lake
St. Louis city County, Wisconsin · 8.8 mi from Koeneman Park Lake
- +Higher grade (F → D)
- +Lower phosphorus (127.5 vs 270.8 µg/L)
5
DJefferson Lake
St. Louis city County, Wisconsin · 7.2 mi from Koeneman Park Lake
- +Higher grade (F → D)
- +Lower phosphorus (70 vs 270.8 µg/L)
How this list is built
Every lake on LakeQuality has a calculated grade from EPA Water Quality Portal samples — secchi depth, total phosphorus, and chlorophyll-a measured against Metropolitan Council thresholds. To suggest cleaner alternatives, we filter lakes within 30 miles to those with a strictly higher numeric score, then rank by grade improvement with a small proximity tiebreak. Cross-state and limited-data lakes are excluded so the list stays locally relevant.