The following National Park Service publications are available for download in PDF format:
Geology - Details of the rock strata seen along the river.
Paddler's Chart - Brief descriptions of 6 stretches of the river.
River Guide 1 - Borman Bridge to Ft. Niobrara National Wildlife Refuge
River Guide 2 - Ft. Niobrara NWR to Berry Bridge
River Guide 3 - Berry Bridge to Brewer Bridge
River Guide 4 - Brewer Bridge to Rocky Ford
River Guide 5 - Rocky Ford to Norden Bridge
River Guide 6 - Norden Bridge to Meadville
You will need to open these files. Adobe Reader is free, and you can download it here.