How do we keep a 10ft dirt wall from falling down

You say a wall, but is it actually a wall as in both sides are not supported, or do you mean a slope ? Clarify because as you say wall, I can really picture a dirt wall. A non supported l0 ft. high dirt wall would surely wash away unless you shored it up with stones or bricks, but then, what would be the point of having a dirt wall.

How can we keep a 10 ft dirt wall from caving in? It's a straight cut away 10 ft wall

I mean it's a slope but then the side of it has been cut away and that side is 10 ft down

You would have to build a brick wall on that side to keep it shored up, or be more decorative and use stones/rocks

10' high is a HUGE job. Means going down below grade to the frost line for your area to fill with gravel, and it means a footing, and it means filling in behind the new wall with more gravel, and providing drainage in spots through the wall. I doubt it's something you can do yourselves. Your best bet is plants appropriate to your part of the world. Any plain old 'wall' you build will buckle and fall over within 2 or 3 years.

When highways are cut with steep sides, a newish technique is to wrap grapefruit sized rocks with chicken wire in somewhat rectangular bundles, and stacking them up the slope. Not a 'wall' because there's some slope to it. Another 'steep slope' way is to use 4 x 4 pressure treated timbers, with pieces of rebar pounded through them like big nails. Each row is 4" back from the row below it. But it won't work if the soil can't be compacted as you go. It will still just all slide down.

As was pointed out... this is not a do it yourself job. Some localities would actually require a permit and licensed people to do it. ( I live in one) because it HAS to be properly designed and built, and there are a LOT of ways to do it wrong.. Do something wrong and it comes crashing down in a few years making an even bigger job.

I agree, permits are required in most places because this wall could kill someone if it collapses. You can not simply build a wall and expect it to hold the dirt back, the wall must have ties buried well into mound of soil.

I forgot about the cheapest 'steep slope' cover of all - used tires. Tie them together with nylon rope in nested rows, cover with top soil, plant water thirsty plants like hosta, and spreading groundcover like pachysandra.

I forgot about the cheapest 'steep slope' cover of all - used tires. Tie them together with nylon rope in nested rows, cover with top soil, plant water thirsty plants like hosta, and spreading groundcover like pachysandra.

Used tires, don't think so, not the most biodegradable land fill for this application. Have plenty of hosta, not water thirsty at all.

????
Of course tires aren't degradable - that's the whole idea - neither is brick or concrete. As for hosta, where I'm from, the roots are enormous and the plants multiply and have to be separated with a hatchet. Often planted under drip edges.

?? I said are not BIOdegradable. They don't even want tires in a land fill site. As for hosta, I have them all over my property Joy, some in areas were they only get rain water and thrive. I haven't got any under drip edges.

I meant biodegradable; shorthand. Again - why would this need to be? It wouldn't. Just because landfills don't want them isn't applicable. Houses in the SW US are made out them, stacked up and filled with red clay soil.

As for hosta, what can I say, used all over here for being very thirsty and having enormous tuberous looking roots.