El Dorado and its eastern environs are defined by the pervasive oil industry that transformed this part of Union County. Multiple production zones including the East El Dorado Oil Field, Champagnolle Oil Field, and Nick Springs Oil Field mark the landscape with a dense network of specialized roads like Spires Ln and Old Cedar Tree Rd. The map reveals a high concentration of community burial sites, from the centrally located Wesley Cem to the outlying Beulah Springs Cem, suggesting a well-established rural social structure alongside the industrial extraction. Small clusters of settlement persist at Smithville and Old Union, while the Nick Springs Lookout Tower stands as a prominent landmark overlooking the creek basins of Salt Cr and Cany Cr.
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This is the sole edition of this map. No revisions or reprints were ever made.
1927 · El Dorado
USGS Topo · 1:62,500
1930 · El Dorado
USGS Topo · 1:62,500
1933 · Strong
USGS Topo · 1:62,500
1934 · Moro Bay
USGS Topo · 1:62,500
1937 · Strong
USGS Topo · 1:62,500
1938 · Moro Bay
USGS Topo · 1:62,500
1939 · Moro Bay
USGS Topo · 1:62,500
1939 · Strong
USGS Topo · 1:62,500
1951 · El Dorado
USGS Topo · 1:62,500
1953 · El Dorado
USGS Topo · 1:250,000