Appendix D " Basin Total, Mountain Counties" Table D-15 Parameter 1980 1985 1990 1995 2000 2005 2010 2015 2020 Population 229578 272823 346018 385722 410899 444830 472991 507386 541781 Avg. Daily VMT/1000 5967 7522 9662 10720 11055 13811 14805 16823 18982