A large share of residential streets between Hill Road and the Boise River in Boise’s North End and in the East End will see chipsealing surface treatment during the course of summer as the Ada County High District does its annual low-cost road maintenance.
This means for part of a day lanes on a given street will have liquid asphalt and chips/rocks applied to the surface. A rubber-tire roller will follow, setting the chips/rocks into the fresh oil. Vehicles can drive on the newly sealed surface 15 minutes later, said ACHD spokeswoman Nicole DuBois.
“If it’s a road with two lanes each direction, we just do one lane at a time,” DuBois said. “We try to keep traffic moving as much as possible, and it’s a pretty quick process.”
Chipsealing extends the life of roads for about seven years at one-ninth the cost of a new asphalt overlay surface, according to ACHD. Chipsealing costs 19 cents per square foot, while an overlay costs about $1.73 per square foot, DuBois said.
ACHD has six chipseal zones in Ada County and rotates chipseal work through each zone every six years.
A nationally recognized pavement consulting firm called NCE was hired by ACHD last year to evaluate the condition of Ada County roads, said Timothy Morgan, ACHD’s deputy director of maintenance.
“The result ranked Ada County roads in excellent to very good condition as a whole, something they attributed to our very aggressive preventative maintenance program, which includes chip sealing,” he said.