Traffic should return to this closed lane of First Avenue South sometime Thursday night, now that utility crews have replaced a century-old piece of broken water main.
This picture shows crews filling the sinkhole with “controlled density fill,” a slurry of soil and fast-drying cement, on Wednesday morning. The mix needs one day to cure, said spokesman Andy Ryan of Seattle Public Utilities. After that, transportation workers will lay blacktop, which needs four to six hours to harden, he said.
Until then, one northbound lane of First Avenue South remains closed between South Massachusetts Street and Edgar Martinez Drive South.
The break, discovered around 1 a.m. Tuesday, happened lengthwise in a 16-inch diameter water main, where SPU fastened a 16-foot long replacement pipe.
A city traffic camera, linked here, shows soil residue and detouring traffic in the area.