A portion of Giles French Park adjacent to John Day Lock and Dam will be closed beginning Tuesday while the Bonneville Power Administration replaces transmission lines from the dam to the substation located on top of the hill south of Interstate 84.  BPA contractors were starting to place temporary fencing to restrict access to the work site.  The U.S. Army Corps of Engineers says due to the severe safety hazard in the work area underneath the transmission lines, it is restricting public access to the far eastern end of Giles French Park through December 15.  The remainder of the park and shoreline are open for use.  The extended timeframe will allow BPA contractors to setup and tear down the temporary fencing and to restore the area.