The road throughout eastern Nebraska is actually a varying surface of materials, dependent on serviceability and proximity to more primary roads such as the interstate highway system. The farther one branches off into the rural landscape, the less maintenance and less expensive the surface. Roads leading from primary asphalt roads lead to dirt, gravel and sometimes even grass.
This logic of the road as a hierarchical variable surface may offer an interesting filter to view the pipeline, which also has a hierarchy of pipeline infrastructure.
The soils too, are interesting to note, that their varying material nature may demand more variation in pipeline design to respond to specific soils and geological changes throughout Nebraska.