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First Street detours

This map shows planned detours for westbound First Street and northbound and southbound California Boulevard. 

Caltrans announced Monday that the closure of First Street for roundabout construction will happen Labor Day week, not in August as first planned.

This closure will require thousands of westbound motorists to detour off First onto side streets or to divert to other Highway 29 overcrossings to avoid backups.

Also, California Boulevard will be blocked to north-south through traffic, although southbound vehicles will still be able to turn westbound onto First.

Caltrans is shutting down First at California to build the first of three roundabouts. The First Street roundabout is expected to open in December.

That’s when traffic on the one-way couplets, First and Second, will be reversed, making First a street leading into downtown.

In its news release, Caltrans said motorists should expect delays and exercise caution during the road closure.

During the closure, motorists driving eastbound on First from Highway 29 will be able to make a right turn on California going south to get to Second and Third streets. Traffic traveling eastbound will be able to make a right turn on California going south.

Detour details

— California southbound will turn left at Clay Street, then right at Seymour Street, then right at Third Street to get back to California to continue southbound.

— California northbound will turn right at Second, then left at Seymour, then left at Clay Street to get back to northbound California.

— First Street westbound will turn right at Walnut Street, then left on Clay to Caifornia.

The northbound First Street onramp, currently closed, is expected to re-open in the fall.

Construction progress of Napa's First Street roundabout.

Construction progress of Napa's roundabouts as viewed from the Embassy Suites property on the north side. In the foreground, First Street and California Boulevard with a construction staging area in the background. 

Construction progress of Napa's First Street roundabout.

Vehicles from northbound California Boulevard turning right last month onto First Street and the Highway 29 overpass. In late August, construction will largely shut down the First/California intersection.

Construction progress of Napa's First Street roundabout.

Construction progress of Napa's First Street roundabout. 

Construction progress of Napa's First Street roundabout.

During the first phase of roundabout construction, the northbound on ramp for Highway 29 at First Street is closed. Motorists are being detoured to the on ramp at Lincoln Avenue. 

Construction progress of Napa's First Street roundabout.

Construction blocks a portion of southbound California Boulevard between First and Second streets. 

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City Editor

Kevin has been city editor since September 2010. He joined the Register in 1973 as a reporter. He covered Napa City Hall and assorted other beats over the years. Kevin has been writing his Napa Journal column on Sundays since 1989.