The Iowa Department of Transportation’s Office of Systems Planning, in cooperation with the Federal Highway
Administration, is responsible for preparing the secondary road report. The report provides federal, state
and local agencies, and the public with statistical information regarding the Secondary Road System.
Information for the report is derived from data reported by each of Iowa's 99 county engineers. Based on these
construction reports, which may have changed the road surface, length, and functional classification, the Iowa
DOT’s database is updated and current as of Jan. 1 each year.
The report contains three major sections: 1) state totals in miles by type of surface; 2) a statistical summary;
and 3) county statistical summaries.