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Iowa Geological Survey
109 Trowbridge Hall
Iowa City, IA 52242
(319) 335-1575



North Twin Lake

Calhoun County

near Jolley

Photo courtesy of Iowa State University Limnology Laboratory.

Watershed Characteristics   Landuse Percentages

(%)

Drainage Area (mi2) 4.50 Artificial 1.45
Drainage Area (Acres) 2,879.82 Barren 1.34
Basin Length (mi) 4.8 Grass 7.70
    Row Crop 72.97
    Water 15.22
    Forest 1.32

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Iowa Geological Survey     109 Trowbridge Hall     Iowa City, IA 52242-1319     Phone: 1-319-335-1575     Fax: 1-319-335-2754