The bridge on Colerain Street between Nobles Lane and Route 51 in Carrick will close for reconstruction today, causing significant changes to traffic patterns.

Temporary signals have been installed at Nobles Lane and Route 51 and will be fully operational when the bridge closes at 10 a.m.

Northbound Route 51 traffic headed for Whited Street will be detoured, as will southbound Route 51 traffic bound for Colerain, which will be closed, or Nobles Lane, where left turns will be prohibited.

Detours will be posted, the Allegheny County Public Works Department said.

Also, one lane will be closed in both directions on Route 51 from 10 p.m. Friday until 6 a.m. Saturday between Midwood Avenue and Whited Street. Pittsburgh police will direct traffic.

The bridge closure will continue until June.

First Published: March 23, 2011, 4:15 a.m.