Seal Coat Information

Road MaintenanceFriction Seal

The City of Twin Falls applies both chip seal and slurry seal each year during the summer months to extend the life of asphalt roads and minimize long-term costs. The City follows a Zone Maintenance schedule that consolidates maintenance projects, minimizing the impact on residents and commuters. Please View Map: Zone Maintenance (PDF)

Important Notice to Motorists

Please follow all road closures and detours that have been put in place to keep drivers off uncured streets.

Chip Seal

Chip seal is applied by spraying a heavy coating of emulsified asphalt oil onto a road surface and then covering the oil with rock. Rollers are then utilized to embed the rock into the oil, forming a new wearing course. A chip seal is applied when the pavement deterioration is greater than what a slurry seal is designed to correct, yet has not deteriorated to the point of requiring an expensive asphalt overlay. A chip seal helps prevent water penetration, reducing subsequent damage to the road bed, along with providing a new wearing course. Used with crack sealing and surface patching, a chip seal significantly extends the life of a neighborhood street.

2022 Chip Seal Project Maps

2022 Chip Seal List

2022 Chip Seal Maps

Prep Work:

The road surface is cleaned of debris, sprayed for weeds and holes patched before the chip seal can be placed.

Chip Seal Placement:

Residences and businesses will receive a door hanger 24 hrs. prior to any work being done on their street. When you receive a door hanger, the work will occur on the following day. Please move your vehicles off of the street for that day. If vehicles are not moved off the street, they will be towed. In the event that a vehicle is towed, it will be towed to an adjacent street out of the work area.


After the chip seal is placed, the excess chips will be swept. Normally this occurs 2 to 3 days after the placement of the chip seal. The residences and businesses will receive a door hanger 24 hrs. prior to any sweeping taking place. Sweeping takes place during night time hours. Please move your vehicles off of the street for the sweepers.

Fog Seal

Fog seal is the application of a thin layer of emulsified asphalt to the existing surface, which seals narrow cracks, restores pavement flexibility, and most importantly restores the underlying pavement structure. Fog seal is generally applied to newer streets that do not require more significant methods such as Chip, Slurry, and Friction Seal. Fog seal is typically sprayed onto the roadway.