[SW6906]

"If I am visualizing this correctly, why not remove the gravel all together and replace it with something like a railroad tie cut at a 45degree angle to make a ramp that is easily removed as necessary. Railroad ties are good to use for this because they are cheap, already treated against rot and insects, easily cut, and virtually indestructible for something like a car driving over it. "

Excellent idea! Use landscape posts driven through it to hold it in place. Likely cheaper and definitely easier than concrete!

[Mamzelle]

I'm thinking this railroad tie is a better idea than just concrete. maybe use some cement as "mortar" to keep it in place an also drive in some rebar through the railroad tie.

Thing is, you have to have the tools to cut it to shape, and we don't know if feline is a gal or guy, but some upper body strength necessary to drive in rebar...

If we're talking a little gal, the cement might be the easiest way to go.