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The 23,000-square-mile (60,000 km 2) Matanuska-Susitna Borough [9] (the Alaskan equivalent of a county) [3] governs the Mat-Su Valley. According to the 2020 Census, the borough's population is 107,081, a 21.7% increase since 2010. [10] The City of Wasilla was founded on Dena'ina land when the Alaska Railroad was constructed in 1917. Knik, also ...
These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers. [ 1 ] [ 2 ] The Alaska region, which is listed with a 2-digit hydrologic unit code (HUC) of 19, has an approximate size of 720,535 square miles (1,866,180 square kilometers ), and consists of 6 subregions, which are ...
14 Upper Colorado region: The drainage of: the Colorado River Basin above the Lee Ferry compact point which is one mile below the mouth of the Paria River; the Great Divide closed basin. Includes parts of Arizona, Colorado, New Mexico, Utah, and Wyoming. 113,347 sq mi (293,570 km 2) 1,800,000: HUC14: 15 Lower Colorado region
The Matanuska River (Dena'ina: Ch'atanhtnu; Ahtna: Ts'itonhna’) is a 75-mile (121 km) long river in Southcentral Alaska, United States. [3] The river drains a broad valley south of the Alaska Range eponymously known as the Matanuska Valley .
The Nenana River (Lower Tanana: Nina No’) is a tributary of the Tanana River, approximately 140 miles (230 km) long, in central Alaska in the United States. [3] It drains an area on the north slope of the Alaska Range on the south edge of the Tanana Valley southwest of Fairbanks .
Alaska Route 7 (abbreviated as AK-7) is a state highway in the Alaska Panhandle of the U.S. state of Alaska. It consists of four unconnected pieces which serve some of the Panhandle communities. The Alaska Marine Highway ferries stop in the cities connecting to the Alaska Highway in Yukon via the Haines Highway.
Afterwards, the valley becomes much narrower with near-vertical rock faces. Miles 7–14 run through a narrow canyon at around 7.5 mph. The Nonvianuk River runs into the Alagnak at around mile 20. To the west, the river meanders over the Alaska Peninsula before flowing into the Kvichak River, which itself flows into Bristol Bay.
The ash-filled valley covers a 40-square-mile (100 km 2) area. [6] The ash can be up to 700 feet (210 m) deep. [7] In places deep canyons have been cut by the River Lethe, allowing observers to see the ash flow strata. Since the ash has cooled, most of the fumaroles are now extinct and despite its name the valley is no longer filled with 'smoke ...