A new network-level pavement asset management system (PAMS) utilizing life cycle analysis and life cycle optimization methods is developed. Integrated life cycle assessment and life cycle cost analysis expand the scope of the conventional network level PAMS from raw material extraction to end-of-life management. To aid the decision making process, a life cycle optimization model is applied to determine the near optimal preservation strategy for a pavement network. A geographic information system (GIS) model is utilized to enhance the network-level PAMS by collecting, managing, and visualizing pavement information data. The network-level pavement asset management system proposed in this paper allows decision makers to preserve a healthy pavement network and minimize life cycle energy consumption, greenhouse gas (GHG) emissions, or cost as a single objective, while also meeting budget constraints and other agency constraints within an analysis period. A case study of a pavement network in Michigan compares the near optimal preservation strategy to the Michigan Department of Transportation's current preservation practice. Compared to the current preservation plan, the optimal preservation strategy reduces life cycle energy consumption, GHG emissions, and cost by 20%, 24%, and 10%, respectively. The impact of annual preservation budget cuts on total life cycle cost is also analyzed.  A $3 million annual preservation budget reduction (75% reduction of current annual budget) will significantly increase user cost (caused by congestion and pavement surface deterioration) by $450 million for a 40-year analysis period.