It’s coming at 7:30 p.m. Friday, the 58-hour closure of State Route 167 in Renton so the state can install a new fish culvert under the freeway.

That means that about 265,000 vehicles will have to find another way to go north and south through South King County.

To avoid regional freeway gridlock, the Washington Department of Transportation suggests that travelers avoid discretionary trips and plan extra time because of the potential delays.

This is one of four major freeway closures in the region this weekend; the state is now at the height of the summer highway-construction season.

SR 167 will reopen at 5 a.m. on Monday, just as the morning commute is gearing up.

The closure is between Interstate 405 and South 180th Street, which is also known as South/Southwest 43rd Street and is the exit to take in either direction to get to Valley Medical Center.

The off-ramp to South 180th Street will remain open on northbound SR 167 and the on-ramp from South 180th Street to southbound SR 167 will remain open. The state says to expect delays at the interchange and to use detours.

The Washington state Department of Transportation suggests two detours, one to Interstate 5 to avoid the area altogether and one using surface streets in south Renton.

The traffic diversion will affect some Renton streets.

The City of Renton signals along Lind Avenue and Oakesdale Avenue favor the north-south through traffic, so the route to Grady Way should be clear, according to Preeti Shridhar, a City of Renton spokeswoman.

The signal timing at Rainier Avenue and Grady Way is now on the city’s new ACS-Lite network, which monitors traffic volumes and adjusts the signal timing automatically, she said.

The closure will allow the Washington Department of Transportation and its contractor, Scarsella Bros., to install a new fish-friendly culvert on Panther Creek where it passes under SR 167 in Renton.

The work is part of a larger project for future SR 167 improvements and will help reduce seasonal flooding to properties along the west side of 167, according to a WSDOT press release.

Crews will remove and replace 65-feet of highway to install the 19-foot wide culvert. They will also work on several other maintenance projects in the work zone to reduce the need for future closures.

Where to get information

• Seattle traffic cameras: www.wsdot.com/traffic/default.aspx

• SR 167 closure information: www.wsdot.wa.gov/Projects/I405/Sr167PantherCreek

• Regionwide: www.wsdot.wa.gov/construction/pugetsound/today.htm

Region’s four major projects

Four major weekend-long highway closures coupled with a city of Seattle ramp closure and a Seahawks game Saturday night could lead to significantly longer travel times on key Puget Sound corridors this weekend.

Drivers are advised to plan ahead, find alternate routes and plan an extra hour of travel time.

Crews working for the Washington State Department of Transportation will close all lanes of three highways to install large culverts.

• State Route 167 in Renton and the State Route 520 floating bridge will close Friday night, Aug. 10, and reopen Monday morning, Aug. 13.

• State Route 9 in Clearview  will close Friday night, Aug. 10, and reopen Sunday morning, Aug 12.

• Crews also will demolish SR 520’s Bellevue Way overpass and add new lanes at the State Route 92/SR 9 intersection in Lake Stevens.

• Seattle Department of Transportation crews will close the ramp to 85th Street from southbound Interstate 5 for 17 days to pave, starting Friday, Aug. 10.