FREMONT -- Rainstorms lashing the Bay Area this week have prompted San Francisco Public Utilities Commission officials to postpone a planned road closure in south Fremont for two days.

An on-ramp to northbound Interstate 680 and a short stretch of Mission Boulevard will close for five hours early Friday morning so that crews can prepare for a nearby water pipeline improvement project, said Daniel Jaimes, a San Francisco PUC spokesman.

The road closure -- originally planned for Wednesday -- was postponed after stormy weather occurred Tuesday, Jaimes said. More rain was expected Wednesday.

The on-ramp and the roadway, set between Interstate 680 and Curtner Road, will close at 12:01 a.m. Friday, Jaimes said. They are scheduled to reopen at 5 a.m., in time for the morning commute, he said.

During those hours, motorists are asked to take alternative routes and avoid the construction area, which borders the city's Weibel, Warm Springs and Vineyards/Avalon neighborhoods.

The road closure is part of a construction project in which seismic upgrades will be made to pipelines along the Hayward fault.

For more information, call 866-973-1476 or visit www.sfwater.org/seismicupgrade.

Contact Chris De Benedetti at 510-353-7011. Follow him at Twitter.com/cdebenedetti.