LOWER SNAKE RIVER, Wash. – If your upcoming Labor Day weekend plans include a road trip to visit family and friends on the opposite side of the lower Snake River, you may want to keep in mind that most U.S. Army Corps of Engineers dams are closed to cross-dam public vehicle traffic on federal holidays, unless otherwise announced. Lower Granite Lock and Dam, near Pomeroy, Wash., will be open for public vehicle crossings during the holiday weekend, offering extended hours – 7 a.m. to 7 p.m. – on Saturday and Sunday, Sept. 1 and 2. On Labor Day, Monday, Sept. 3, Lower Granite will be open for crossings and return to its non-summer schedule, 7 a.m. to 5 p.m., daily.