Hurricane Harvey: Lot washed out/eroded
I've come across a property that we're making an offer on, and one of the larger issues is that it borders on one edge with a creek, and it appears that all the water flow from the gutters were unmitigated and during heavy 2016/2017 rain and hurricane time frames, has essentially eroded away about 10% of the front yard in the form of large crevices from the base of the house gutter pipes toward the creek. A few trees will likely have to be removed because the washout has stripped earth from a good part of the roots, and they are likely to fall over now. Those seem easy, just having them removed. We've already planned to use corrugated pipe to properly manage the water straight from the downspouts to the creek, so no further issues arise...
What I'm looking for are some DIY ideas on how to go about shoring up the lot edge near the creek so I can start back filling these crevices so there is even ground out to the edge of the lot again. Any ideas are welcome.