1
ASpiritwood Lake
Stutsman County, Wisconsin · 11.5 mi from Jamestown Reservoir
- +Two grade letters higher (D → A)
- ++25 ft water clarity
Cleaner Lakes Than Jamestown Reservoir
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Jamestown Reservoir carries a Grade D (Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Spiritwood Lake (Stutsman County, Grade A, 11.5 mi away) is the closest meaningful upgrade.
2
BJamestown Reservoir
Stutsman County, Wisconsin · 3.2 mi from Jamestown Reservoir
- +Two grade letters higher (D → B)
- ++1.2 ft water clarity
5
CHehn-Schaffer Lake
Stutsman County, Wisconsin · 26.4 mi from Jamestown Reservoir
- +Higher grade (D → C)
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.