Pennsylvania
Kinzua, PA 1949
Old topographic maps from before the flooding. Contemporary DRG map can be seen by dragging the transparency slider above.
Altoona Reservoir System History
The Altoona PA Water system is fascinating -- due to the turbidity of the water flowing into the system, they have a series of grit screens and sedimentation tanks similiar to what you would find in a waste water treatment plant. This is due to heavy sedimentation from historical logging and mining of the land above the plant.
World Famous Horseshoe Curve
The Horseshoe Curve is a three-track railroad curve on Norfolk Southern Railway's Pittsburgh Line in Blair County, Pennsylvania. The curve is roughly 2,375 feet long and 1,300 feet in diameter.