One of four single-track tunnels built by the Blue Ridge Railroad, the 4,273-foot Crozet Tunnel was constructed at a time when hand drills, pickaxes, and black powder amounted to state-of-the-art tunneling technology. At the time of its completion, it was the longest railroad tunnel in the world. Envisioned and built by Claudius Crozet, a French-born educator and civil engineer, the tunnel remains a testament to his belief in advancing rail transportation even when faced with numerous difficulties.
1976
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Image Credit: Public Domain (National Park Service)Image Caption: Crozet's Blue Ridge TunnelEra_date_from: 1858
1976
"This is the first Portland cement concrete street built in the United States ... Here started the better roads movement which has given our citizens from coast to coast swift and sure transportation."
- Historic marker, Bellefontaine, Ohio, celebrating the 50th anniversary of America's first concrete pavement, 1941
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Image Credit: Public Domain (Author's Choice)Image Caption: First Concrete PavementEra_date_from: 1893
1976
Fossil Creek meanders ten miles to the Verde River, dropping some 1,600 feet during its course and, at the turn of the century, enticed miners in the copper-rich Irving area to use a new technology -- hydroelectric power. A seven-mile series of flumes brings the water from a dam below Fossil Spring to the Irving Plant and then to Stehr Lake.
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Image Credit: Original Image: Public Domain (National Park Service)Image Caption: Childs-Irving Hydroelectric ProjectEra_date_from: 1909
1976
Innovations
