The Washington State Department of Transportation says construction will begin Monday to rehabilitate the Highway 97 bridge over the Bickleton Highway.  Work will include repairing damaged driving surface areas, overlaying the decks with fresh concrete, and replacing the guardrail.  During construction there will be a temporary traffic signal in place to guide travelers through the work zone, and flaggers will also be used periodically throughout the project.  Travelers through that area should expect delays of up to 20 minutes when flaggers are present.  The project is expected to be finished in June.