Washed out driveway repair that lasts means correcting the water, not dumping more gravel on it. Regrade the surface so it crowns or slopes to a ditch, put angular base rock down over a compacted subgrade, and give runoff a place to go (a ditch, a rolling dip, or a culvert) before the first big storm. Refilling ruts with loose rock is a patch, and it'll usually be gone again after the next heavy rain.
It's early October. The first real storm in the Sacramento Valley foothills is usually a few weeks out, and that's the best window to do this work, while the ground is still dry enough to cut and compact. Walberg, Inc. does this kind of repair for property owners around Corning, Red Bluff, Chico and Redding, and the pattern is almost always the same.
Why does a gravel driveway wash out?
Water picks the easy path. On a driveway, the easy path is down the wheel ruts. Once a rut forms, it carries more water, the water moves faster, and the rut gets deeper. By January you've got a gully you can lose a tire in.
Four things cause most of it:
- No crown or cross-slope, so water runs down the middle of the drive instead of off the side.
- A long, steep run with nothing to break up the flow.
- Rounded river rock or pea gravel, which rolls like marbles instead of locking together.
- Runoff from a roof, a neighbor's field or a road cut that dumps onto the driveway from above.
Foothill soil adds its own problem. A lot of the clay and decomposed granite around Tehama and Butte counties turns slick when wet and then sheds rock like it's greased. If the base underneath was never compacted, the gravel on top just sits there waiting to move.
What a repair that lasts looks like
Here's the sequence we'd follow on a typical rural driveway.
First, read the water. Walk the driveway during or right after a rain if you can. Where does it enter? Where does it leave? That tells you whether you need a ditch, a dip, a culvert, or just a better surface.
Second, regrade. We cut the ruts out, reshape the surface with a crown or a steady cross-slope, and recompact the subgrade. This is the step most quick fixes skip, and it's the one that matters. Grading is a core part of what we do, and you can read more on our grading and site preparation page.
Third, put the right rock back. Angular crushed base rock (the jagged kind) packs and locks. Round rock doesn't. A compacted base with a thinner surface layer on top holds up far better than a deep pile of loose gravel.
Fourth, move the water out. That might be a side ditch, a rolling dip every so often on a steep stretch, or a culvert where the drive crosses a drainage line. For bigger drainage problems we tie the work into a proper storm drain installation.
If the driveway is more than a repair (new alignment, new base, maybe paving later), that's house pad and driveway work, and it's worth planning the drainage first and the surface second.
Which fix fits which problem?
| What you're seeing | Likely cause | Usual fix |
|---|---|---|
| Two parallel ruts down the length | Water running in the wheel tracks | Regrade with a crown, add angular base |
| Gravel piled at the bottom, bare dirt at the top | Steep grade, round or loose rock | Regrade, recompact, add rolling dips |
| Gully cut across the drive | Runoff crossing from one side | Culvert or a cross-drain, then rebuild the surface |
| Soft, muddy low spot | Water pooling, poor base | Dig out, add base rock, fix the drainage |
| Washout at the road edge | No culvert or undersized one | Culvert, which may need a county permit |
When more gravel is actually the right answer
Sometimes it is. If the drive is flat, the base is solid, and you've only lost a little surface rock to traffic, a load of fresh angular gravel and a pass with a blade is all you need. We'd tell you that on the phone rather than send a crew for something you can handle with a rented tractor.
The trade-off cuts the other way too. If the driveway has washed out two winters in a row, adding gravel a third time is money you won't get back. Regrading and drainage cost more up front. They also stop the annual repair.
Do you need a permit to fix a driveway washout?
Usually not for work that stays on your own property. It changes when you touch the county road. In Tehama County, the Department of Public Works requires an encroachment permit for driveway culvert work in the county right of way, and their encroachment permit page explains the process and fees. The county code also requires a culvert when an improved driveway would send runoff onto the roadway. Butte and Shasta counties have their own rules, so call the public works office before you dig near the road.
Make sure whoever you hire is licensed. You can check any contractor on the CSLB license lookup. Walberg's license is #898860 (A, C-21, C-22).
Common Questions
How do I stop a dirt driveway from washing out?
Control the water first. Crown or slope the surface so runoff leaves the driveway instead of running down it, add a ditch or culvert where water collects, and use compacted angular base rock. Surface rock alone won't hold on a slope without those pieces.
What's the best rock for a gravel driveway that keeps washing out?
Angular crushed rock, usually a compacted road base with a smaller surface layer over it. The jagged edges interlock under traffic. Rounded gravel and pea rock roll apart and are the first thing to leave in a storm.
Can I just add more gravel to a washed out driveway?
You can, and it'll look good for a few weeks. If the underlying problem is water crossing or running down the drive, the new gravel follows the old gravel. Add rock only when the base is sound and the grade is already right.
When is the best time to repair a driveway before winter?
Before the ground gets wet, which in the north valley means October and early November in most years. Compaction works best on moist but not saturated soil, and a crew can't cut a clean grade in mud. If the rains start early, we'd wait for the ground to firm up rather than push mud around.
The bottom line
If your driveway has washed out once, it'll wash out again unless the water gets a new path. Do the regrade and drainage now, while the dirt is dry, and save the new rock for the last step. If you're in Corning or the surrounding area, see our Corning service area page, or contact us with photos of the damage. When you're ready, request a free estimate and we'll tell you honestly whether you need a full regrade or just a load of rock.