For months (years actually), I tried to accomplish a wet and dry ground together. I gave up along time ago, and then tonight I thought I would try again. I thought a reasonable transparency map (image) would do it, but I was unsuccefull. So, it is time to ask. Maybe someone can come in a give a try or have something to help solve my problem. Partially wet, and partially dry ground in some areas.  I gave an image example what I am trying to accomplish.

maybe plug a b/w cloud node into the reflection channel.

Yeah, a cloud node in the specularity and reflection nodes.
Also, a reverse of that in a bump node. See how there's almost no bumps visble in shiny parts.

^^ sounds very reasonable, I would have suggested the same - something to mask the areas where you want low specular values, although be aware if you use a clouds node it will be random; if you really want it "how you want it" then make a specular or reflection map.

A cloud nod is a great idea, although I am working on it now (many attempts already), still struggling. I do have a texture map already in use, along trying to use the B/W cloud with it. Noise is also needed to help make the ground (road), and I have that already in the bump. So, I guess you can see where I am going with this. I did have a png (grainy transparency image) in use, but after reading some pointers, I removed it. Still trying,

Well, getting somewhere slowly. I will continue this tmrw night. If you notice on image example (Post #1), that some part are more reflective, and other areas are not.  

Have you tried using two ground objects? one for the water and one for the dry ground?

I would make the water one flat and with a high reflective setting and use a bump map on the ground one to rase parts out of the water with a less reflective setting. Then just move the ground one up through the water untill you get the desired result.

Attached Link: Pavement Puddles Shader

Here's my version. I used a Fractal_Sum to generate the puddles. I used a Spots node to make the ground texture. You could use a photo instead.

My ground was scaled to 4000%. You may have to adjust the scale of some nodes to match your ground or road prop.

You can get the Poser material file at the link.

OMG!! Just amazing! Will have to look into this when I get home.

Fabulous work Bagginsbill!

I could have never figured this out on my own after playing around with the shaders. I am wondering how to change the puddle sizes. I would like em larger. I am having problems doing this.

Change the scale values in the Fractal_Sum node. Bigger is bigger.