Transportation Data, GIS & Modeling


The CADD files you will find here were were digitized from the USGS quadrangles over a period of 15 years. We update the State, US, and Interstate Highways every year. Non-state owned roads, streets, railroads, airports and other features on the maps are updated at irregular intervals and may be out-of-date.

For questions about the CADD data listed on this page, please contact: Mark Bozanich @ 360-596-8921

Use the quad map below to to help you choose which files CADD (.dgn) to download. Or, for a more extensive list of available .dgn files please visit our FTP site.

Each .dgn file represents a 30 x 60 minute quadrangle. Each was digitized at a scale of 1:24,000 or 1"= 2000'.

The file names match the reference codes on the map, which correspond to a geographic area in the state.

0416t 0424t 0432t 0440t 0448t 0456t 0464t 0808t 0816t 0824t 0832t 0840t 0848t 0856t 0864t 1208t 1216t 1224t 1232t 1240t 1248t 1256t 1264t 1608t 1616t 1624t 1632t 1640t 1648t 1656t 1664t 2008t 2016t 2024t 2032t 2040t 2048t 2056t 2064t 2408t 2416t 2424t 2432t 2440t 2448t 2456t 2464t 2824t 2832t 2840t 2848t

Or... use a larger version of the quad map.


We have created some word documents to assist you with the various files types located on the ftp server. We have provided the two most requested below:

NOTE: Most of the digital files on the ftp site are between 1 - 5mb but some of the TIFF files are larger than 12mb and may take longer to download depending on your internet connection. Also, you may be able to read shapefiles and DGN formats using other software so please refer to your software manuals or visit for shapfile reader or Bentley for dgn reader.