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Crushed rock or crushed rock clay mix for driveway and ramp to garage
I think the crushed rock is the route to go. I agree with Frank in using 2" crushed in the bottom 2/3 and then 3/4" or 1" in the top 1/3. The only draw back to the washed rock is that it well move on you with sort of like marbles unless it has some fines to help bind it together. Too many fines though especially clay material will seal it off and as you mentioned water will not drain. You might ask your supplier where they have put down each type so maybe you could look at and see what it looks like when it is dry and when it rains on it.
Early in my highway career I was involved with the regraveling of many miles of county roads in Montana for the Air Force. These were farm to market roads but were also access roads to the Minute Man Missile silos and control centers. The primary users were the local farmers and ranchers with grain trucks and horse trailers and of course the Air Force. You talk about trying to come up with a gravel road that would hold up under all conditions. About 80% of the time there was either complaints about the gravel raveling from not enough fines or bing muddy when it rained from too many fines. Most of the bitching was from the farmers and ranchers seldom from the Air Force. On day I was out on the road and was talking to a rancher who happened to be a County Commissioner. He told me "don't me too concerned with all the bitching about the roads. IF we ranchers and farmers didn't have something to bitch about we wouldn't be happy". From my experience I concluded there is no such thing as a gravel road that pleases everybody.
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Crushed rock or crushed rock clay mix for driveway and ramp to garage
Ken, you might take a look at Harvey's 2-22 post on this subject. He pretty much covered what you are looking for except I would go for 1 inch to 11/2 inch maximum. Just make sure it is uniformly graded which means it has been crushed so it has different size rock from the maximum down to the fines. As Harvey mentioned, the fines or the binder material is usually a clay material that passes the 200 sieve (smallest sieve that is usually used). You need about 10% to bind it but not much more or it will be crappy when it rains. In your part of country the more durable rock is crushed out of the river bars (if you can find it close by)rather rock quarries because a lot of the rock in the Coast range is marine basalt which will break down when exposed to water. I know all about your rain since I lived outside of Vancouver for 30+ years. I'd still be there if it wasn't for all those cloudy days from Nov. to April.
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Crushed rock or crushed rock clay mix for driveway and ramp to garage
-200 material means all the material that will pass through a no. 200 sieve. A no. 200 sieve means there are 200 openings per square inch. Some people refer to it as the P200 material with the P standing for passing through a 200 sieve. Clay in a dry state and puliverized will pass through the 200 screen. In comparison sand is material that passes though a no. 10 sieve (10 openings per sq inch) but will not pass through the 200 sieve). Part of -200 mateial comes from clay that is stuck to the larger rock when it is fed in to the crusher. Sometimes it is additional clayey material fed in with the rock. It can be a problem getting it added in if it is too wet (clay balls).
When calling around just ask if their driveway material has any minus 200 material for binding the material together so it will set up and not be just loose rock. Again you do not want more than about 10% or it will be muddy when it gets wet.
Usually most driveway surface rock is 1 inch minus or 3/4 inch minus. 1 inch minus means every thing will pass 1 inch by 1 inch sieve. 3/4 inch minus means all the rock will pass a 3/4 inch by 3/4inch sieve. It also should be uniformly graded which means it has different sizes from the larger down to smaller and a little bit of the P200 to bind or cement it together.
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