PHOENIX — State Route 89A in the Oak Creek Canyon switchbacks (mileposts 387-390) was partially reopened this morning after crews reopened the southbound lane, according to the Arizona Department of Transportation.

Both lanes of SR 89A were closed Saturday afternoon after a sinkhole was spotted on the northbound lane of the two-lane roadway.

Both directions of traffic will be guided through the area with assistance from a flagger until the northbound lane is reopened.

ADOT started the repairs after geotechnical engineers completed an inspection Monday that determined the repairs could start immediately. Crews used heavy equipment to excavate a six-foot deep, eight-foot-wide section of the roadway to remove loose material underneath the pavement near milepost 388.

Today, ADOT is scheduled to repave the northbound lane after filling the void with a liquid concrete-cement mix that needed to harden overnight before work can begin.