MAUGANSVILLE - A fist-sized puncture in the shoulder of Maugans Avenue on Sunday night grew overnight into a gaping hole.
Beneath the street's surface, where water eroded the limestone, the chasm was greater. Joseph Kroboth III, the county's public works director, said the sinkhole was about 20 feet at a narrow point and about 30 feet at its widest.
The depth varied from about 22 feet to more than 30 feet, he said.
County officials said they expected to plug both the hole and the underground caverns that jutted out like wings by the end of Monday night.
One lane of Maugans Avenue was closed while the sinkhole was filled.
A Washington County emergency dispatcher said the lane reopened at about 9:45 p.m.
Monday afternoon, when the bed of a dump truck tilted up, boulders tumbled out, into the hole, kicking up dust.
A worker in an excavator lowered a bucket into the sinkhole to stuff rocks into cavern openings.