Walkers should expect problems with mud and mudslides all along the Camino route in Navarra, and exercise caution.
As I've posted on another thread about the weather here, the Guardia Civil has indicated that the walker's path from St. Jean Pied-de-Port to Mt. Erro/Zubiri is impassable due to snow. Past Zubiri, the trail is deeply muddy and there is danger of mudslides all along the Camino because Navarra has received 2/3 of its annual rainfall in the past month and a half alone.
There has been considerable flooding around Pamplona in February, a we've even had a section of Pamplona's old defensive walls collapse because of the excessive rainfall.
This occurred in a section of the wall past the cathedral, closer to the area near the Plaza de Toros, not on the side where the Camino passes.
There's been so much rainfall that the ground cannot absorb all the water, and the water has been a factor in the 40+ minor earthquakes that have been felt in Uterga and around the Sierra de Perdón as a result of the pressure on plates and the fault that runs under the Sierra and Pamplona. Yep, it's been an a hard winter here. Just waiting for the locust plagues to start... :|
I cycle quite a bit around Pamplona on the weekends, including along sections of the Camino. We haven't been able to go out for weeks because of the rain, and the one time we were able, we had to stick to asphalted roads. The trails in every direction, including the Camino, are too muddy right now. Anyone walking the Camino in Navarra right now must be prepared for lots of mud and exercise caution.