Iowa Department of TransportationAuthoritative Iowa Winter Road Conditions for 2016-2019. Records are the first instance of when the data changed. This was done to reduce the number of records to only when the attributes of the event were modified. D ownload a file geodatabase Zip by year: 2016-2017 2017-2018 2018-2019ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/4a452ee137d546119e1202573ba58f82_0engIowaDOT Open DataPublicHistoric Iowa Road Conditions [Iowa]Web servicesIowaLast Modified: 2021-06-23