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LakeQuality

Cleaner Lakes Than St. Croix 0.3 Mi. Downstream of I Lake

1 higher-graded lake within 30 miles, ranked by grade improvement and proximity.

St. Croix 0.3 Mi. Downstream of I Lake carries a Grade C (Fair) water quality score. Within 30 miles, 1 lake holds a higher grade. Mcdonald Lake (Washington County, Grade C, 5.6 mi away) is the closest meaningful upgrade.

1
C

Mcdonald Lake

Washington County, Minnesota · 5.6 mi from St. Croix 0.3 Mi. Downstream of I Lake
  • +Higher overall water quality score
  • +Lower phosphorus (21 vs 34 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.

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