County GIS Data (1:100,000 scale)
Black Hawk County
Bremer County
Cedar County
Cerro Gordo
Mitchell County
Scott County
Worth County

USGS Quadrangle GIS Data (1:24000 scale)
Cedar Falls Quad
Charles City Quad
Clear Lake Quad
Colwell Quad
Cresco NE Quad
Danville Quad
Davenport E Quad
Davenport W Quad
Dorchester Quad
Fertile NE Quad
Fertile SE Quad
Gilbertville Quad
Greene Quad
Lowell Quad
Manly Quad
Mason City Quad
New Haven Quad
Nora Springs Quad
Northwood Quad
Orchard Quad
Osage Quad
Ridgeway Quad
Shell Rock Quad
St Ansgar Quad
Waverly Quad

Watershed GIS Data (1:24000 scale)
Upper Iowa River
Yellow River