Meteorological history | |
---|---|
Duration | May 2009 |
Overall effects | |
Damage | Unknown |
Areas affected | Yukon River,Chena River,Tanana River,Kuskokwim River,Susitna River |
The 2009 Alaska floods were a series of natural disasters taking place in the United States state of Alaska during April and May 2009. The floods were a result of heavier-than-normal winter snowfall and above-average spring temperatures that resulted in rapid melting of the winter snowfall. The resulting high water levels were magnified in places by the development of ice dams which caused catastrophic flooding. The record-breaking flood that affected Eagle,Alaska in early May is the best example of an ice dam causing flooding beyond the norm.
The winter of 2008–2009 brought unusually heavy snowfall to much of Alaska. Kotzebue,on the Bering Sea coast,received a record 102 inches of snowfall—more than double the average of about 40 inches. [1] In other locations,winter snowfall did not set records but still was heavier than average. Fairbanks,Alaska's second-largest city,received 71.5 inches of snow and experienced unusually cold temperatures for the first three months of the year,preventing early melting of the snowpack. [2] [3] Snow also fell heavily in Lake Minchumina and the Alaska Range. [4] [5] At Eagle,the ice on the Yukon River was 55 inches thick—over 40 percent greater than normal. [6]
By mid-April,concerns were raised that the heavy snowpack would pose a problem if it melted quickly. "There's plenty of snowpack out there to cause problems this year," warned a National Weather Service meteorologist at the time. [6]
In Fairbanks and most of Interior Alaska,temperatures remained below freezing for most of April and temperatures did not hit 50 degrees until April 26. [7] After that date,temperatures rose rapidly. By April 28,the snowpack at Fairbanks International Airport had melted,leaving only snow berms and piles. [7] The next day,Fairbanks recorded a record high temperature of 74 degrees. On April 30,Fairbanks set an all-time high temperature for the month of April when the thermometer reached 76 degrees. Record high temperatures also were recorded at Eagle,Delta Junction,and other towns in central Alaska. [8] In less than one week,central Alaska residents went from skiing to swatting mosquitoes. [9] The warmup was so rapid that on May 1,the Alaska Division of Forestry issued its first wildfire alert of the year. [10] By that date,however,rivers across central Alaska were already flooding. [11]
The Tanana River valley was the first area of Alaska to experience spring flooding. On April 28,the ice on the Salcha River broke up,flowed into the Tanana River,and formed an ice jam. The jam partially dammed the river,flooding low-lying areas of the town of Salcha. [11] High temperatures during the following couple of days added to the ice jam,and several families were forced from their homes by the rising water. Fairbanks North Star Borough officials set up a self-serve sand bag station at the Salcha Fairgrounds,and residents near the river erected impromptu levees. [12] The Salcha ice jam broke loose on April 30,causing flood levels to decline dramatically. Record-high temperatures that day caused jams to form on other rivers in the area,however. [13]
On the Chatanika River,a jam caused a flood that threatened several homes before the ice broke loose and dropped water levels to near normal. [13] By May 1,almost the entire Fairbanks North Star Borough was directly threatened by some sort of flooding. In Fox,small-stream flooding caused a house to be evacuated. Flooding was reported in North Pole and in rural areas of the borough. [14] On May 2,high water on the Chena River swept through Fairbanks,causing flooding in low-lying areas. [15] The high water caused the U.S. Army Corps of Engineers to consider closing the floodgates at the Chena River Lakes Flood Control Project,a structure built to protect Fairbanks from flooding. [16] The high water registered just below the threshold to close the gates,however,and they remained open throughout the flood. By May 5,the water receded in Fairbanks and the surrounding area as the Tanana River drained floodwater into the Yukon. [17] The draining high water ripped a barge away from its moorings in the Tanana River near Nenana,causing it to float down the Yukon River until it was arrested by a helicopter. [18]
On May 6,multiple ice jams formed on the Kuskokwim River near the villages of Upper and Lower Kalskag. These jams caused the snowmelt-bolstered river to flood areas around both villages,forcing residents to take action. [19] After the jams broke and flowed downriver,they re-formed near Akiak. The resulting flood caused the evacuation of more than 10 percent of the town's residents to nearby Bethel,while many of the remaining residents sought shelter in the local school. [20]
On May 3,an ice jam formed on the Susitna River,causing flooding that washed out the tracks of the Alaska Railroad. Large chunks of ice also were pushed onto the tracks,making work difficult for crews assigned to repair the rail line. [21] The incident severed rail traffic between Fairbanks and Anchorage until May 7,when track repairs were completed and the railroad resumed service. [22]
On May 3 and May 4,ice on the Yukon River near the Alaska/Canada border began to break up. Open water was seen near the town of Eagle,which is just west of the border. On May 4,a large ice jam developed about 10 miles downriver of Eagle. [23] The high-flowing Yukon,fueled by snowmelt from the high temperatures of the previous week,soon flooded the town. Large chunks of ice were carried over the town's riverbank retaining wall and smashed into stores and buildings. The Alaska Native settlement of Eagle Village was severely flooded and virtually destroyed by marauding blocks of ice. In Eagle itself,floodwater lifted buildings off their foundations and caused havoc for the town's 120-plus residents.
The high water released by the break-up of the Eagle ice jam reached Circle,the next significant town downriver from Eagle,in early May.
The river surge hit Fort Yukon on May 7 and early in the morning of May 8. Although the flood reached 4 feet (1.2 m) above flood stage,it did not top the town's Yukon River levee. [24] Areas outside the levee received minor flooding,and some residents were evacuated to the village school and to Fort Yukon Air Force Station. [25]
The surge of water released from the Yukon River near Eagle in the first week of May reached the lower Yukon villages of Grayling,Holy Cross,and Nulato by May 16. [26]
Initial responses to the flooding were organized by people and organizations closest to the separate disasters. Most efforts were focused on assisting residents of Eagle,but notable help was given to other affected communities,including Akiak and Stevens Village.
On May 3,National Park Service employees from the headquarters of the Yukon-Charley Rivers National Preserve in Eagle moved to support residents of the town who had been flooded out of their homes. Supplies of food and water were delivered to old Eagle Village on May 5,and the next day,officials from the Alaska Division of Homeland Security and Emergency Management arrived to manage the response from a headquarters set up at Eagle's school. By Thursday,May 7,National Park Service helicopters were airborne,checking on people in isolated homesteads near and within the preserve. [27]
On May 6,Governor Sarah Palin declared the drainages of the Yukon,Kuskokwim,Kobuk,and Susitna rivers to be disaster areas. [28] The next day,she canceled a trip to attend the White House Correspondents Dinner in order to survey the damaged communities. [29]
In Fairbanks,private citizens donated more than 7,000 pounds (3,175 kg) of supplies to Eagle residents. The amount of donations was so great that the airline that volunteered to fly the supplies to Eagle was overwhelmed. [30] By May 7,the total amount of private donations exceeded 10,500 pounds (4,763 kg). [27]
By May 10,larger amounts of government aid began reaching affected areas. Akiak on the Kuskokwim River received diesel fuel,potable water,food,and other items,while four 400-gallon (1,514-liter) water tanks were sent to Eagle to alleviate problems caused by contaminated wells. [31]
Interior Alaska is the central region of Alaska's territory,roughly bounded by the Alaska Range to the south and the Brooks Range to the north. It is largely wilderness. Mountains include Denali in the Alaska Range,the Wrangell Mountains,and the Ray Mountains. The native people of the interior are Alaskan Athabaskans. The largest city in the interior is Fairbanks,Alaska's second-largest city,in the Tanana Valley. Other towns include North Pole,just southeast of Fairbanks,Eagle,Tok,Glennallen,Delta Junction,Nenana,Anderson,Healy and Cantwell. The interior region has an estimated population of 113,154.
The Yukon River is a major watercourse of northwestern North America. From its source in British Columbia,Canada,it flows through Canada's territory of Yukon. The lower half of the river continues westward through the U.S. state of Alaska. The river is 3,190 kilometres (1,980 mi) long and empties into the Bering Sea at the Yukon–Kuskokwim Delta. The average flow is 6,400–7,000 m3/s (230,000–250,000 cu ft/s). The total drainage area is 833,000 km2 (321,500 sq mi),of which 323,800 km2 (125,000 sq mi) lies in Canada. The total area is more than 25% larger than Texas or Alberta.
Fairbanks is a home rule city and the borough seat of the Fairbanks North Star Borough in the U.S. state of Alaska. Fairbanks is the largest city in the Interior region of Alaska and the second largest in the state. The 2020 Census put the population of the city proper at 32,515 and the population of the Fairbanks North Star Borough at 95,655,making it the second most populous metropolitan area in Alaska after Anchorage. The Metropolitan Statistical Area encompasses all of the Fairbanks North Star Borough and is the northernmost Metropolitan Statistical Area in the United States,located 196 miles by road south of the Arctic Circle.
Galena is a city in the Yukon-Koyukuk Census Area in the U.S. state of Alaska. At the 2020 census the population was 472,slightly up from 470 in 2010. Galena was established in 1918,and a military airfield was built adjacent to the city during World War II. The city was incorporated in 1971.
Manley Hot Springs is a census-designated place (CDP) in Yukon-Koyukuk Census Area,Alaska,United States. At the 2020 census the population was 169,up from 89 in 2010.
Nenana (Lower Tanana:Toghotili;is a home rule city in the Yukon-Koyukuk Census Area of the Unorganized Borough in the Interior of the U.S. state of Alaska. Nenana developed as a Lower Tanana community at the confluence where the tributary Nenana River enters the Tanana. The population was 378 at the 2010 census,down from 402 in 2000.
Tanana is a city in the Yukon-Koyukuk Census Area in the U.S. state of Alaska. At the 2010 census the population was 246,down from 308 in 2000. It was formerly known as Clachotin,adopted by Canadian French.
Tanacross is an endangered Athabaskan language spoken by fewer than 60 people in eastern Interior Alaska.
The Tanana River is a 584-mile (940 km) tributary of the Yukon River in the U.S. state of Alaska. According to linguist and anthropologist William Bright,the name is from the Koyukon (Athabaskan) tene no,tenene,literally "trail river".
The Elliott Highway is a highway in the U.S. state of Alaska that extends 152 miles (245 km) from Fox,about 10 miles (16 km) north of Fairbanks,to Manley Hot Springs. It was completed in 1959 and is part of Alaska Route 2.
The Yukon Quest,formally the Yukon Quest 1,000-mile International Sled Dog Race is a sled dog race scheduled every February since 1984 between Fairbanks,Alaska,and Whitehorse,Yukon,switching directions each year. Because of the harsh winter conditions,difficult trail,and the limited support that competitors are allowed,it is considered the "most difficult sled dog race in the world",or even the "toughest race in the world"—"even tougher,more selective and less attention-seeking than the Iditarod Trail Sled Dog Race." The originator envisioned it as "a race so rugged that only purists would participate."
The Fairbanks Daily News-Miner is a morning daily newspaper serving the city of Fairbanks,Alaska,the Fairbanks North Star Borough,the Denali Borough,and the Yukon-Koyukuk Census Area in the U.S. state of Alaska. It is the farthest north daily in the United States,and one of the farthest north in the world. The oldest continuously operating daily in Alaska,by circulation it is the second-largest daily in the state. It was purchased by the Helen E. Snedden Foundation in 2016. The Snedden family were longtime owners of the News-Miner,selling it to a family trust for Dean Singleton and Richard Scudder,founders of the Media News Group in 1992.
Lower Tanana is an endangered language spoken in Interior Alaska in the lower Tanana River villages of Minto and Nenana. Of about 380 Tanana people in the two villages,about 30 still speak the language. As of 2010,“Speakers who grew up with Lower Tanana as their first language can be found only in the 250-person village of Minto.”It is one of the large family of Athabaskan languages,also known as Dené.
Alaska Route 2 is a state highway in the central and east-central portions of the U.S. state of Alaska. It runs from Manley Hot Springs to the Canada-United States border,passing through Fairbanks and Delta Junction. Alaska Route 2 includes the entire length of the Alaska Highway in the state,the remainder of the highway being in the Yukon Territory and British Columbia,Canada.
The 2008 Tanana Valley flood or the 2008 Fairbanks flood was a flood in late July and early August 2008 that affected several rivers in the central portion of the American state of Alaska. The city of Fairbanks,Alaska saw high water levels,while the towns of Nenana,Salcha,and Old Minto received heavy damage. The Salcha River and Tanana River reached their second-highest levels since record-keeping began,while the Chena River,which bisects Fairbanks,was kept below flood stage by the use of the Chena River Lakes Flood Control Project.
Jumble ice is a phenomenon that occurs when ice atop a river or other flowing body of water fractures due to the different flow rates beneath the ice. On a lake,pond,or other stationary body of water,ice forms undisturbed and generally does not move as long as the entire surface of the body of water is frozen. When a river freezes,water flow typically continues beneath the ice,exerting pressure on it. If the ice fractures,pieces of ice torn free by the river's current will collide with stationary or slower-moving pieces. After becoming stuck in place,the loosened pieces of ice refreeze irregularly,causing a rough,or jumbled,surface.
Eagle Summit is a 3,652 feet (1,113 m)-tall gap through the White Mountains of central Alaska. The gap was named after the nearby Eagle River by prospectors from nearby Circle,Alaska.
The history of Fairbanks,the second-largest city in Alaska,can be traced to the founding of a trading post by E.T. Barnette on the south bank of the Chena River on August 26,1901. The area had seen human occupation since at least the last ice age,but a permanent settlement was not established at the site of Fairbanks until the start of the 20th century.
The Nenana Ice Classic is an annual ice pool contest held in Nenana,Alaska. It is an event in which individuals attempt to guess the exact time the Tanana River ice will break up at Nenana. Tickets are on sale from February 1 through April 5 of each year throughout Alaska. The Nenana Ice Classic is a non-profit charitable gaming organization. As such,the proceeds benefit many volunteer and non-profit organizations.
The Tanana Athabaskans,Tanana Athabascans or Tanana Athapaskans are an Alaskan Athabaskan peoples of the Athabaskan-speaking ethnolinguistic group. They are the original inhabitants of the Tanana River drainage basin in east-central Alaska Interior,United States and a little part lived in Yukon,Canada. Tanana River Athabaskan peoples are called in Lower Tanana and Koyukon language Ten Hʉt'ænæ,in Gwich'in language Tanan Gwich'in. In Alaska,where they are the oldest,there are three or four groups identified by the languages they speak. These are the Tanana proper or Lower Tanana and/or Middle Tanana,Tanacross or Tanana Crossing,and Upper Tanana. The Tanana Athabaskan culture is a hunter-gatherer culture and have a matrilineal system. Tanana Athabaskans were semi-nomadic and as living in semi-permanent settlements in the Tanana Valley lowlands. Traditional Athabaskan land use includes fall hunting of moose,caribou,Dall sheep,and small terrestrial animals,and also trapping. The Athabaskans did not have any formal tribal organization. Tanana Athabaskans were strictly territorial and used hunting and gathering practices in their semi-nomadic way of life and dispersed habitation patterns. Each small band of 20–40 people normally had a central winter camp with several seasonal hunting and fishing camps,and they moved cyclically,depending on the season and availability of resources.