UPDATE at 10:15 p.m.: The SDOT reports that the Mercer Street I-5 ramps reopened just before 10 p.m. Saturday. The Seattle Times has more here.
The Seattle Department of Transportation says in an email that the Mercer I-5 on- and off-ramps will reopen on Sunday at 5 a.m. instead of Monday morning as originally planned. The northbound I-5 on-ramp at University Street and Fairview Avenue N. will also reopen then.
Crews finished saw-cutting of pavement at Fairview and Mercer early for future utility installations, the email says, “as well as surveying the ramps in preparation for re-alignment with future westbound lanes of Mercer Street.”
There are numerous police on duty in South Lake Union this evening, directing traffic around the closed ramps. Traffic was heavier than usual on cross streets in South Lake Union earlier today. Things seem to be moving fairly well despite the closures.