Every April I get the same calls. The driveway was fine all winter. Then the ground thawed, one wet week turned everything into soup, and now there are ruts an inch deep where the tires run, the edges have collapsed into the lawn, and there's a pothole at the culvert that wasn't there a month ago. That's mud season doing what mud season does. And the fix depends entirely on why it happened.
What mud season actually does
New Hampshire's frost line runs about four feet deep. All winter, that frozen layer locks everything together — soil, gravel, base, fines, the lot. The ground is harder than concrete and it can carry whatever drives across it without complaint. Then the thaw starts, and it starts from the top. The surface goes soft while the ground below is still frozen solid. Water has nowhere to go. It can't soak down through the frozen layer, and if your driveway doesn't have somewhere else for it to drain, it just sits there. Your tires do the rest.
A driveway that washes out every spring isn't a gravel problem. It's a water problem.
The four ways driveways fail in mud season
- Rutting. Gravel isn't the issue — the issue is saturated base underneath. Tires push the gravel sideways into the soft base, and you get channels the width of the wheels. Topping with fresh gravel helps for about two weeks; the ruts come back because the base is still wet.
- Edge collapse. The shoulders of the driveway turn into mud that the tire catches and pulls into the lawn. You end up with an hourglass shape — narrow in the middle, ragged on the sides.
- Culvert washouts. When the culvert under the driveway is undersized or partly clogged, spring flow backs up and goes around instead of through. Once water finds a path around the pipe, it erodes fast and takes a chunk of driveway with it.
- Potholes at the low points. Every driveway has a sag somewhere. Water collects there, tires grind the wet base, and by the end of April there's a six-inch deep bowl that grabs the undercarriage every time you go out for groceries.
Why the cheap fix fails twice
The standard spring patch job is another yard or two of gravel dumped on top and raked flat. On an otherwise-healthy drive, that's fine — it's a top-dress, and it'll hold through the next winter. But if the damage came from saturated base, a culvert problem, or bad grade, the new gravel sinks into the same wet base within a month. You've spent a few hundred dollars to paper over the symptom. The cause is still there, and next April you'll be making the same call.
Fixing it right means figuring out why the water stayed on or in the drive in the first place. That's where a real rebuild separates from a top-dress.
What a real rebuild looks like
- Proper crown. A gravel drive should shed water toward the sides, not trap it. A 2-4% crown (gentle center-high shape) is enough to send surface water to the shoulders instead of into the wheel tracks.
- Right base depth. Sub-base of larger crushed stone under a layer of crushed gravel. The base is what the load rides on; if it's thin or contaminated with fines, you don't have a drive, you have dressed-up dirt.
- Swales or side drainage. Water shed by the crown needs somewhere to go. A shallow swale along the uphill side, or a proper ditch, keeps that water from just running back onto the drive.
- Sized culverts. The culvert under the drive needs to carry the actual flow the property sees in a wet spring. Undersized culverts are the most common cause of spring washouts I see.
- Regrade where the pitch is wrong. Sometimes the original driveway was cut in a way that slopes water toward the house or collects it in a low spot. Fixing that is regrading — not top-dressing.
What it actually costs
A top-dress on a healthy drive, assuming nothing structural needs fixing, is usually the cheapest job I do in April — fresh gravel, raked clean, crown restored. A full rebuild of a short residential driveway, including base work and a new culvert, typically runs $3,500 to $9,000 depending on length, grade, and how much base has to come out. Uphill drives, rocky lots, and drainage work push the higher end of that. The full guide on pricing lives here if you want to see the real cost anchors.
When to call
If the drive was fine in February and has problems now, the cause is spring-specific — water, drainage, or base. If you’ve been topping it every spring for three years and it keeps coming back, you don’t have a gravel problem. You have a drainage problem wearing a gravel costume. The fix is upstream of the gravel, and the longer you wait the more expensive it gets, because each spring cycle takes another chunk of base with it.
Best move: let me walk the site. I can usually tell in ten minutes whether you’re looking at a top-dress, a regrade, a culvert swap, or a full rebuild. Straight answer, free estimate, no pressure.