Re: C&TS National Scenic Designation *LINK*

The National Register “system” has a category for Historic Corridors, such as roads, railroads, canals or trails.
The standards for the Corridors are more accepting of changes over a period of time that those used for individual buildings.
The Colorado Legislature’s actions are a bit strange, as the process of listing a property on the National Register doesn’t require an act of the legislature. The process calls for the State Preservation Officer (referred to as the “SHPO”) to review the property and make a finding, for either the State, Local or National Registers. Nominations for the National Register go through the National Park Service.
National Register listings do not specifically bring any money or other support, and the protection is relatively weak (basically you can’t do harm to the resource with Federal funds), but it is a significant recognition which helps with grants, and is required for some funding programs like the Save America’s Treasures program.
Randy Hees