State Route 89A switchbacks remains closed, sinkhole repairs now underway (with video)

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, where the sinkhole was originally spotted on Saturday afternoon on the northbound lane.

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, where the sinkhole was originally spotted on Saturday afternoon on the northbound lane.

PHOENIX - Repairs of the roadway damage caused from a sinkhole started this week along State Route 89A in the Oak Creek Canyon switchbacks, but the roadway remains closed (mileposts 387-390) and is expected to remain closed until later this week, according to the Arizona Department of Transportation.

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, where the sinkhole was originally spotted on Saturday afternoon on the northbound lane.

After the earthwork was completed, crews filled the void with a liquid concrete-cement mix that needs to harden for at least 24 hours before the roadway can be repaved.

In an effort to expedite the repairs as soon as possible, ADOT is currently contacting potential contractors to get the asphalt that will be needed to complete the paving.

Prior to construction, a team of geotechnical engineers conducted a field inspection of the sinkhole this morning and determined that it could be repaired immediately.

With SR 89A closed from the Pine Flats Campground to the Vista Point scenic overlook, the recommended detour from Sedona to Flagstaff is to take State Route 179 to Interstate 17. The detour could add up to an extra half hour of travel time for motorists commuting between Sedona and Flagstaff. For the most current information about highway closures and restrictions statewide, visit ADOT's Travel Information Site at www.az511.gov, follow us on Twitter (@ArizonaDOT) or call 5-1-1.

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