Update on the Highway 99 closure north of downtown: By dawn, SDOT says, both directions should be back open – southbound now, northbound around 4 am. They’ve finished “demolition activities on the east side of the SR 99 bridge over Mercer Street,” so that’s why they’re reopening, though if you’re traveling on the surface in the area, note that Mercer itself is expected to remain closed until 5 am Monday as scheduled, while crews haul bridge debris.