Sorry the IWI LiDAR Portal will no longer be supported.
To download LiDAR data please visit Minnesota: http://www.mngeo.state.mn.us/chouse/elevation/lidar.html#data
North Dakota: https://gishubdata.nd.gov/dataset/lidar-data-download
The International Water Institute has developed a LiDAR download portal that enables users to dowload and access LiDAR data and derived elevation aqcuired as part of the Red River Basin Mapping Initiative.
Download LiDAR data and products