I came across several of these when digging out my pond. This one was accidentally hit by the excavator. I need to find some better pictures, I can't remember how many toes they had.
Edit: I couldn't find any more photos, but I did find two videos with the Amphiuma in them. You can download/view them here:
https://drive.google.com/drive/folders/1GAsWmYMBujpUgpkXmPRLsxDrQTyYhC07?usp=sharing
This was years ago before I looked them up, so I was calling them newts in the video.
About to get run over on the road, we moved her out of harm's way!
Juvenile with regenerated tail at tip