Dalton Highway Update 4/30/2016
No water has topped road
Aerial view of an excavator maintaining one of the trenches dug to facilitate the flow of water in the Sag River.
Photo courtesy of Alyeska Pipeline Service Company
Alaska Department of Transportation and Public Facilities (DOT&PF) staff and contractor Cruz Construction continue to work to protect the Dalton Highway, Mile 390-407, from overflow from the Sag River. No water has topped the road.
Currently, the trenches and berms are preventing overflow from impacting the Dalton Highway. Water is flowing in the ice trenches, and ice has formed against the temporary gravel berm at Mile 395 and would otherwise be over the roadway. Last year’s grade raise from Mile 397-405 has kept water from the roadway in several locations.
Excavators that were maintaining the trenches will be pulled off the ice this weekend because of increased temperatures. Next week, contractor Brice Inc. will start construction of a second gravel berm near Mile 398, with the goal of mitigating potential damage to the highway.
Temperatures are beginning to get warmer, and the amount of water flowing near the road is increasing. All indications point to an earlier than normal spring, and the department is preparing for breakup to happen in the next few weeks.
There is potential for repeat flooding this year, though the magnitude depends on future temperatures and river conditions. If there is spring flooding on the Dalton Highway, staged material and equipment will enable the department and contractors to respond quickly.
Aerial view of east channel of the Sag River with water flowing. Photo courtesy of Alyeska Pipeline Service Company.
Updates will be shared as conditions change. To view all updates or to subscribe to receive updates, visit http://dot.alaska.gov/nreg/