Diagonal and the neighboring settlement of Knowlton anchor this Ringgold County landscape, situated where the Grand River and several tributary creeks like Wolf Creek and Plum Creek carve through the Iowa countryside. The town of Diagonal is characterized by its organized grid and the Diagonal Post Office, serving as a local hub for the surrounding agricultural community. To the north, the Sun Valley Lake Dam contains the waters of Sun Valley Lake, a significant local water feature that contrasts with the traditional farm-to-market road network including Co RD j23.
27 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
1940 · Blockton
USGS Topo · 1:62,500
1943 · Blockton
USGS Topo · 1:62,500
1945 · Mount Ayr
USGS Topo · 1:62,500
1947 · Mount Ayr
USGS Topo · 1:62,500
1955 · Nebraska City
USGS Topo · 1:250,000
1957 · Nebraska City
USGS Topo · 1:250,000
1958 · Nebraska City
USGS Topo · 1:250,000
1981 · Arispe
USGS Topo · 1:24,000
1981 · Shannon City
USGS Topo · 1:24,000
1981 · Diagonal
USGS Topo · 1:24,000