News & Press Releases

Friday, August 13, 2010
Parts of Dry Creek and Cartwright roads to be chipsealed; cyclists urged to use caution

ACHD will chipseal a portion of Dry Creek and Cartwright roads next week and cyclists and motorcyclists are cautioned to take care while traveling through the area because of heavy equipment, loose gravel and fresh oil while the work is underway.

The chipseal will occur from Humphreys Way in Hidden Springs to the intersection of Pierce Park Lane. Crews expect to be on the roads from Monday through Friday.

Dry Creek and Cartwright roads are part of the “Dump Loop,” a popular cycling route, which also includes portions of Bogus Basin, Hill and Seaman’s Gulch roads. 

Chipsealing is a maintenance activity that involves the application of liquid asphalt, rock chips and a sealing layer of oil to provide a wear surface to protect the asphalt below. The annualized cost of chipsealing a road is one-quarter of the cost of repaving a deteriorated road.

In recent years, ACHD has begun to use smaller chips, which provide a smoother road surface that has been well received by the public. The District’s maintenance staff will monitor the chips over the next several years to determine if the smaller chips are providing the same level of protection for the pavement.

More on chipsealing:  Chipsealing is the most cost-effective way to maintain the county’s nearly 2,200 miles of local public roadway. The cost for chipsealing is around $23,000 a mile. Chipsealing saves taxpayer dollars because it protects the road from deterioration and greatly delays the need for a new asphalt overlay to repair a failed road. At this time, overlays (new blacktop) cost around $208,000 per mile.
To apply the chipseal, a truck sprays the road with liquid asphalt. Shortly after that, a spreader applies rock chips. Then a rubber tire roller sets the chips into the fresh oil. ACHD follows each chipseal with a fogseal that helps set the chips and controls fly-rock and dust. Motorists should drive slowly in newly chipsealed areas to prevent flying rock.

Because of ACHD’s chipsealing practices, Ada County roads are rated some of the best in the Northwest.  Chipsealing is done around the country, including other parts of Idaho.  More chipsealing information, as well as maps of the areas being treated this year, is available on the ACHD Web site at  For updates on chipsealing, residents can call 345-7880.

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