General Contact Number: (530) 621-5567


Travel Demand Model


The framework of the TDM is complete. Minor modifications are being done to the baseline model as staff works with the public and the Board of Supervisors to finalize the 20-Year projection out to year 2035. Upon completion, the County can begin work on several projects, including the major 5-Year update of the Capital Improvement Program (CIP), and the Traffic Impact Mitigation (TIM) Fee Program. *If you would like more information, or would like to see a demonstration of the TDM, click “Contact Staff” below

County staff has been coordinating with Caltrans since 2012 as part of the process to update the County’s Travel Demand Model (TDM).  Over the past few months, County and Caltrans staff have been working to fine-tune the TDM to address any remaining questions.  As a result of this close collaboration, the County received a letter from Caltrans on Sept. 22, 2014 stating their concurrence with the TDM and their finding that it “conforms to the state-of-practice in travel demand modeling; meets overall traffic assignment validation standards suggested by FHWA and Caltrans; and is an appropriate tool for the County’s long range planning purposes."  Caltrans’ concurrence with the TDM is a very important step in moving forward with the County's major updates to the Capital Improvement Program (CIP) and Traffic Impact Mitigation (TIM) Fee program, Phase 2 of the Missouri Flat Master Circulation and Financing Plan (MC&FP), construction of roadway improvement projects, and other near- and long-term planning efforts.   

TDM Phase 1 (Completed)  


  • Creation of TDM
  • Background
  • Need for TDM
  • TDM Workshops and Meetings
  • Assumptions and Methodologies


TDM Phase 2 (Ongoing)


  • CIP - Major 5-Year and Annual Updates
  • TIM Fee Program Major 5-Year and Annual Updates
  • Draft TDM Results
  • Analysis for Targeted General Plan Amendment and Zoning Ordinance Update
  • Development Project Analysis

Frequently Asked Questions 



Contact Staff