GeoData developed for The Nature Conservancy (USA) an ArcGIS tool that would fragment a river network using known barrier locations and compute a range of connectivity metrics.  Understanding the availability of upstream and downstream network generated the data required to help prioritize barrier removal. 

This tool was used in a North East US barrier prioritization project and more recently on barriers in the Amazon basin.

Report: Northeast Aquatic Connectivity - An Assessment of Dams on Northeastern Rivers