Step 1: Land Manager Permission.
CITA does not own the land for any of the trails that it maintains, and land managers have a right to say what can or cannot happen on their property. Based on who the land manager is, there might be multiple steps to getting permission for any new trail or changes.
Step 2: Trail Design/Contracting.
The design of the trail includes multiple factors, such as the topography of the land, length of the trail, difficulty, and features. All of these items will play a large roll in the time and cost that it takes to build the trail, as well as what it will take to maintain it after completion. The design also has to be approved by the land manager, and occasionally by others as well. Once the project has been approved, an invitation to gather bids from trail building companies may be needd.
Step 3: Fundraising.
While some trail is built by volunteers, some work requires professional involvement. Features like bridges may need to be designed by a professional engineer, and some land managers require that trails are built by professionals as well. Since CITA is a non-profit, the organization often relies on personal donations or grants to put in new trail or features. While these are very much appreciated, they can also take a long time for review and approval.
Step 4: Building.
The day is finally here. The land manager has approved of the design, all engineering has been done, and the builders (professional or volunteer) are onsite with tools in hand. Based on the scope and number of workers, a section of trail can go in over a single day, or can take months to fully complete.