
Maquoketa Caves State Park anchors the northern portion of this landscape, where the Maquoketa River and Raccoon Creek cut through the terrain to reveal a Natural Bridge and numerous Caves. The area reflects a transition from early industrial extraction to conservation, evidenced by the presence of several Quarries and a Sandpit alongside the Eden Valley County Refuge. Settled nodes like Baldwin and Nashville are connected by an Old Railroad Grade, tracing a corridor of former transport that once linked these rural communities.
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1891 · DeWitt
USGS Topo · 1:62,500
1891 · Maquoketa
USGS Topo · 1:62,500
1891 · Baldwin
USGS Topo · 1:62,500
1892 · Wheatland
USGS Topo · 1:62,500
1894 · Wheatland
USGS Topo · 1:62,500
1901 · Peosta
USGS Topo · 1:125,000
1901 · Rock Island
USGS Topo · 1:125,000
1910 · Rock Island
USGS Topo · 1:125,000
1958 · Davenport
USGS Topo · 1:250,000
1959 · Dubuque
USGS Topo · 1:250,000