The road over Hells Canyon Dam will be closed from 7:30 a.m. to 3:30 p.m. on Monday through Wednesday, Aug. 26-28, according to Idaho Power. Flaggers on both sides of the dam will alert drivers and stop traffic. Depending on the amount of traffic and work conditions, the road will be opened briefly every two hours to allow traffic to pass. Be aware the timing of these crossing opportunities will be determined by the ongoing work schedule, and cars will only be allowed to pass when crews are able to clear equipment from the dam. The closure is necessary because of heavy equipment on the dam being used for ongoing maintenance of the spill gates, Idaho Power officials said.