The section below where the road crosses it is just class II and III till it hits the Filo Bobos
The roadside section of the Río Alseseca is probably the easiest part. The section below Puente Tablazos is very difficult. There are a few drops that can be run and then walk back to the bridge but if you keep going it cliffs out with big waterfalls. This part is one of the steepest. The other is where the river turns back to the right just above a small tributary coming in from the left. Much of this is just really hard to scout due to the terrain and vegetation. One part that is accessible is
Santuario Pezma. Rafael and some of his friends have been running the drops there. I occasionally hear rumors that so and so has run all of the Alseseca and sometimes that there is a video of the feat. The Alseseca just below the road from Altotonga to Zapotitlán has a gradient of 1000ft/mile for about a kilometer. I found it hard to even walk that gradient and it was smooth, shear walls with tight twisty turns and no visibility ahead and hardly wide enough for a kayak and certainly no room for dodging anything. I would say that the name of the river changes at the right hand bend mentioned above. I doubt that anyone has run
all the Alseseca but certainly parts other than the section along the roadside have been run. The geography in this area is just really very confusing and most people probably have no idea what they ran.
- Tom Robey