The Oregon Department of Transportation is warning travelers on Interstate 84 through the Gorge to be ready for a wintery mix of weather over the next week and have supplies with them in case of major delays.  ODOT crews have been treating I-84 with deicer and salt both before and after a series of crashes on the icy, snow-packed road that closed the westbound lanes between Hood River and Cascade Locks from Tuesday night until Wednesday afternoon.  The crashes delayed the arrival of the equipment that could clear the road, leading to a buildup of ice and snow.  ODOT says with more severe weather expected in the days ahead, travelers should avoid I-84 in the Gorge. If you go, check tripcheck.com or call 5-1-1 for the latest road and weather conditions, give yourself extra time, slow down, and drive for conditions, carry chains and know how to use them, and carry supplies like blankets, food, water, and medications.  Commercial vehicles are required to carry chains in snow zones under Oregon law and to put them in use when weather conditions require them for travel.  Extra tire chain enforcement is in effect around the state.