Eastern Nebraska soil is very alkaline too, as is the ground water. It doesn't seem to be a detriment to growing vegetables here. Clay may not be too bad of a deal when it comes to water and nutrient holding capabilities.
When I lived in New Jersey, the ground was so hard that you needed a pick axe to dig a hole. I had a yard of mushroom compost delivered and had a fantastic garden - not even tilled in. I can't imagine your needing a gigantic depth with the proper amendments.
Raised beds take a lot of material. Spading it up and adding a layer of cardboard under the amendments will go a long way. Find whatever you can to throw in around your place.
- Lisa
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