'Cause I happen to know just putting more gravel in the pot hole doesn't work for very long...
Need some specifics--obviously I have to fix the base I just don't understand what that entails and what equipment I need (or need to hire.) I've got a 1000+ feet of driveway and most of it is great so I just need to "spot treat" it somehow.
We get a skid loader order some #2 stone dig out the hole refill base w/ 2's then add crush run and add layer of stone dust my drive is about 600 feet long w/ turn and a slight hill. We also have slow down bumps the help divert run off so no deep wash outs occure.
You need to regrade those spots--the surface around the potholes is hard and new gravel is soft--the new stuff just gets tossed out the moment you drive over it. A box blade with scarifying teeth will do the trick as long as you have a fairly beefy tractor. Dig up and soften the whole pothole with the teeth, then level with the box blade. Correctly set and leveled you can do it all in a few passes.
Compared to the tractor, a box blade is pocket change. $700-800, tops. With a long gravel driveway like yours (ours is 1/4 mile) you will be ever so glad you have this item. Very handy for moving footing around in dirt paddocks/arenas, too, once you master the art of not gouging the h*ll out of everything with those big teeth. You can even move a little bit of snow with them--Tennessee snow, not Michigan snow.
There are some nifty arena graders that will do double duty, but I haven't got one of those. The box blade is big and mean and has no trouble with the hard-packed gravel, whereas I'd not want to mangle an arena grader doing tough work like that.
Clarksdale, MS--the golden buckle on the cotton belt
I've found that filling with what we call 6/10 limestone will permanently fill a pothole so it's like concrete. 6/10 is a mix of limestone dust and crushed limestone. Wet it down before you fill the hole, fill to just a bit above ground level, let it set for a day and then drive over and over it.
We had a gravel bar from the main road in a ditch that formed a dam. I'd go down with my shovel and a cart, fill the cart, bring it home and dump. My potholes seem to be as permanently filled as you're likely to ever get in a gravel drive.
"I'm a lumberjack, and I'm okay." Thread killer Extraordinaire
I fill mine with 3/4" drain rock and it works great. 3/4"minus did not work so well for some reason. I've found some good info at this website before --- the Center For Dirt and Gravel Road Studies. LOL!