Seal Coat roads may “bleed or flush” asphalt during periods of high traffic or high temperatures. The asphalt (tar) that seals the surface and holds the aggregate in place expands within the existing voids and reaches the surface where it can be picked up by vehicle tires. This phenomenon rapidly occurs and is unpredictable. Generally, with it being a thermal expansion the asphalt should not expand beyond its previous temperate experience, but that is where traffic plays a role in compressing the unstable surface and pumping the asphalt to the surface.
Key Services & Resources
Miles of Pride.
The Pottawattamie County Secondary Roads Department is responsible for all construction and maintenance on the county highway system. Pottawattamie County’s road system is made up of 959 square miles, the second largest in the State of Iowa. The Secondary Roads Department has 251 paved two-lane miles and 1231 unpaved two-lane miles with 346 bridges, 1700+ culverts, and approximately 17,000 signs.
We have 64 employees and 10 maintenance shops, in:
- Honey Creek
- Keg Creek
County Ordinances: https://www.pottcounty-ia.gov/about/county_code/
Fax: (712) 328-4751
7:00 AM - 3:30PM
223 S 6th St
Council Bluffs, IA 51501