Why was the Baffin Bridge closed?

As part of the project design, two small bridges are being built at the crossings to and from Belmont and Redwood Shores. The Baffin Bridge was closed while the contractor constructed the bridge. During construction of the Baffin Bridge, the second bridge to the west remained open to allow access to/from Redwood Shores. Now, the Baffin Bridge has been installed and is open for public use while the contractor completes the second bridge.