After extraction, review the log window for errors like:
This guide covers everything you need to know about using HEC-GeoRAS with ArcGIS Desktop 10.8. What is HEC-GeoRAS? hec georas for arcgis 10.8
Pro Tip for ArcGIS 10.8: Use the Snapping environment to ensure endpoint continuity between layers. After extraction, review the log window for errors