The problem with running a pump is that I don't have anything that is big enough to outpump the fill-rate of the feeder creek. I think that I'll be able to make a tiny coffer dam with some red clay around the base of the culvert and work quickly to fill in the main washout with more clay, before it runs out liek crazy. Otherwise, maybe I'll just let it run out, it's not like it's going to mess up the integrety of the embankment any more than it already is... or is it? Should I dig into the embankment a few feet and re-pile and compact the soil, to try and snuff out the muskrat tunnels?

Tonight may be the night!