Marsh Valley serves as the central corridor for this part of Bannock County, where irrigation and aviation infrastructure meet the rising slopes of the Portneuf Range. The agricultural character of the valley is defined by the Portneuf Marsh-Valley Canal and a grid of rural roads such as S England Rd and S Webb Rd. The town of Downey sits at the heart of this landscape, supported by the Downey (Hyde Memorial) Airport and nearby settlements like Cambridge.
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1915 · Preston
USGS Topo · 1:96,000
1918 · Preston
USGS Topo · 1:125,000
1948 · Bancroft
USGS Topo · 1:62,500
1949 · Bancroft
USGS Topo · 1:62,500
1954 · Pocatello
USGS Topo · 1:250,000
1955 · Preston
USGS Topo · 1:250,000
1958 · Pocatello
USGS Topo · 1:250,000
1958 · Preston
USGS Topo · 1:250,000
1962 · Preston
USGS Topo · 1:250,000
1968 · Malad Summit
USGS Topo · 1:24,000