Caltrans was planning on initiating a feasibility study to evaluate alternatives to either rehabilitate the Pit River Bridge or abandon using the existing bridge for highway traffic and construct a new bridge for such purposes. There were six potential alternatives under consideration. Due to the resource-intensive nature of performing feasibility studies, especially for a project of this size and complexity, it was decided that a preliminary screening effort was needed to reduce the six alternatives.
Using the Value Metric approach, VMS develop quantitative values for performance, cost and time (schedule). In addition, the team performed a risk analysis of the various alternatives, which provided additional information relative to the degree of uncertainty and potential impacts to cost, schedule and the expected performance of each.
- Evaluate the six options relative to the best value.
- Make a formal recommendation to focus the forthcoming Feasibility Study and optimize the expenditure of resources.
- Two alternatives were identified to carry into the feasibility analysis phase for further evaluation and development.
- Recommended the constructability and maintainability of the foundations be explored first.