Asphalt Patching and Pothole Repair in Oshkosh, WI
Potholes in Oshkosh are a spring crop. They do not appear in the cold; they appear when the frost comes out of the ground, and there is a clean mechanical reason for that. Through winter the moisture in the clay freezes from the top down and the pavement rides on a solid block. In March the top few inches thaw while the ground below is still frozen, so the meltwater has nowhere to go. WisDOT sets its statewide spring weight restrictions on exactly this basis, averaging March 9 through May 9. For those eight or nine weeks the pavement is floating on saturated, unsupported clay, and anything driving over a weak spot punches through it.
A proper patch is a small excavation, not a shovel of cold mix. The failed area gets saw-cut back to sound pavement in a square, the broken material and any wet base underneath comes out, the hole gets compacted, and hot mix goes back in and gets rolled. Cutting square matters because a feathered edge is the first thing to fail; compaction matters because uncompacted mix is a pothole with a delay timer. Done properly a patch is as durable as the pavement around it and will take sealer over the top after it has cured.
Cold patch has a role, and it is a narrow one. In February, when nobody in Winnebago County is running a hot mix plant and there is a hole in your driveway that will eat a tire, cold mix is the right call. It is a temporary plug meant to get you to April. The mistake is treating it as a repair, leaving it for two years, and being surprised when it works loose. If someone is quoting you cold patch as a permanent fix in July, they are saving themselves a saw and a plate compactor at your expense.
When a crack has become a patch job
There is a line where sealing and filling stop being useful and the pavement needs material removed and replaced. These are the signals that you have crossed it.
- Alligator cracking, a webbed pattern of interconnected cracks, in any area larger than a car hood
- A section that visibly dips and holds water for a day or more after rain
- Pavement that flexes or feels spongy when you press down hard with a heel
- Edges crumbling away along the side of the driveway with no curb to hold them
- A hole deep enough that you can see loose stone or wet base material in the bottom
Alligator cracking is the diagnostic one. It is not a surface condition. It is what pavement does when the base beneath it has lost its bearing strength, which in this town usually means water sitting in clay.
Patch, overlay, or start over
Once a base problem is confirmed, the question is how much of the pavement is affected. That ratio, not the age of the driveway, is what decides the answer.
Patch the failures
Under roughly a quarter of the area is affected and the rest is sound. Cut out the bad areas, replace them, then seal the whole surface once everything has cured.
Overlay the surface
The base is sound but the surface is worn out across the board. A new lift of asphalt goes over the top after the failures are repaired. This only works if drainage is genuinely fine, because an overlay adds nothing to bearing strength.
Full replacement
A third or more of the area is failing, or water ponds across the driveway. Tearing out and rebuilding lets the base and the grade be corrected, which is the only permanent answer to a lakebed drainage problem.
A contractor who inspects a spongy, ponding driveway and quotes sealcoating without mentioning any of this is selling you four months of black. Ask what is happening underneath before you agree to anything, and see [what these jobs typically run](/cost).
Asphalt Patching and Pothole Repair FAQs
Why do the same potholes keep coming back in the same spot?
Because the problem is under the pavement, not in it. A recurring pothole in the old lakebed almost always means water is collecting in the base at that point and the clay below cannot drain it away. Each freeze lifts the area, each thaw drops it, and the surface eventually gives up. Patching the surface again will buy a season. Fixing it means opening the area, finding out why water is arriving there, and correcting the drainage or the grade before the new mix goes in.
Can a patched area be sealcoated?
Yes, once it has cured. Fresh hot mix needs the same 30 to 60 day wait that a new driveway does, so a patch placed in June can be sealed in August and a patch placed in October should wait for spring. The patch will always be slightly visible under sealer because the texture differs, and that is normal. What sealer does for a patch is protect its edges, which are the weakest part of any repair and the first place water tries to get back in.