This document summarizes a study of infrastructure needs for North Dakota's county, township, and tribal roads and bridges from 2015 to 2034. Key factors influencing road and bridge conditions are increased oil and gas development and agricultural production. The study analyzed pavement and traffic data, forecasted 60,000 new oil wells and increased crop yields, and modeled resulting vehicle trips. It estimates total biennial investment needs, including $548 million for unpaved road maintenance, $377 million for paved roads, and $70 million for bridge replacements. Converting very high traffic gravel roads to pavement would cost an additional $58 million for the first biennium.