Portal Peak is a mountain summit located four kilometers west of Bow Lake in

Banff National Park Banff National Park is Canada, Canada's first National Parks of Canada, national park, established in 1885 as Rocky Mountains Park. Located in Alberta's Rockies, Alberta's Rocky Mountains, west of Calgary, Banff encompasses of mountainous ter ...

, in the

Canadian Rockies The Canadian Rockies () or Canadian Rocky Mountains, comprising both the Alberta Rockies and the British Columbian Rockies, is the Canadian segment of the North American Rocky Mountains. It is the easternmost part of the Canadian Cordillera, w ...

Alberta Alberta is a Provinces and territories of Canada, province in Canada. It is a part of Western Canada and is one of the three Canadian Prairies, prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, t ...

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

. Its nearest higher peak is Mount Thompson, to the northwest. Portal Peak is situated east of the

Wapta Icefield The Wapta Icefield is a series of glaciers located on the Continental Divide of the Americas, Continental Divide in the Waputik Mountains of the Canadian Rockies, in the provinces of British Columbia and Alberta, in Yoho National Park in the Can ...

, and is a member of the

Waputik Mountains The Waputik Mountains are a mountain range of the Canadian Rockies, located on the Continental Divide between Banff and Yoho National Park. Covering an area of , the range is located west of the Howse, Blaeberry and Amiskwi Rivers and east ...

. Portal Peak can be seen from the

Icefields Parkway Highway 93 is a north–south highway in Alberta, Canada. It is also known as the Banff-Windermere Parkway south of the Trans-Canada Highway ( Highway 1) and the Icefields Parkway north of the Trans-Canada Highway. It travels through Banff Nat ...

at Bow Lake.

History

Portal Peak was named in 1916 by Charles Sproull Thompson (1869-1921), who participated in numerous first ascents in the Canadian Rockies. In August 1897, Charles Thompson, Hugh Stutfield, and J. Norman Collie camped on the shores of Bow Lake; then proceeded to climb the Bow Glacier, which at that time descended farther down into the valley; then crossed the Wapta Icefield to attain the summit of

Mount Gordon Mount Gordon is a cinder cone in the Wrangell Mountains of eastern Alaska, United States, located between Nabesna Glacier and the stratovolcano Mount Drum. It is the most prominent of a group of Pleistocene and Holocene The Holocene () is t ...

. Portal Peak flanks one side of Bow Glacier, which in 1897 was considered the portal to the Wapta Icefield. The mountain's name was officially adopted in 1924 by the

Geographical Names Board of Canada The Geographical Names Board of Canada (GNBC) is a national committee with a secretariat in Natural Resources Canada, part of the Government of Canada, which authorizes the names used and name changes on official federal government maps of Canad ...

. The

first ascent In mountaineering and climbing, a first ascent (abbreviated to FA in climbing guidebook, guide books), is the first successful documented climb to the top of a mountain or the top of a particular climbing route. Early 20th-century mountaineers a ...

of Portal Peak was made in 1926 by D. Duncan and L. Hudson.

Geology

Portal Peak is an

overthrust A thrust fault is a break in the Earth's crust, across which older rocks are pushed above younger rocks. Thrust geometry and nomenclature Reverse faults A thrust fault is a type of reverse fault that has a dip of 45 degrees or less. If ...

peak situated between the Bow Glacier and

Peyto Glacier __NOTOC__ Peyto Glacier is situated in the Canadian Rockies in Banff National Park, Alberta, Canada, approximately northwest of the town of Banff, Alberta, Banff, and can be accessed from the Icefields Parkway. Geography Peyto Glacier is an ou ...

. Like other mountains in Banff Park, Portal Peak is composed of

sedimentary rock Sedimentary rocks are types of rock (geology), rock formed by the cementation (geology), cementation of sediments—i.e. particles made of minerals (geological detritus) or organic matter (biological detritus)—that have been accumulated or de ...

laid down during the

Precambrian The Precambrian ( ; or pre-Cambrian, sometimes abbreviated pC, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of t ...

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...

periods. Formed in shallow seas, this sedimentary rock was pushed east and over the top of younger rock during the

Laramide orogeny The Laramide orogeny was a time period of mountain building in western North America, which started in the Late Cretaceous, 80 to 70 million years ago, and ended 55 to 35 million years ago. The exact duration and ages of beginning and end of the o ...

Climate

Based on the

Köppen climate classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...

, Portal Peak is located in a

subarctic climate The subarctic climate (also called subpolar climate, or boreal climate) is a continental climate with long, cold (often very cold) winters, and short, warm to cool summers. It is found on large landmasses, often away from the moderating effects of ...

zone with cold, snowy winters, and mild summers. Winter temperatures can drop below -20 °C with wind chill factors below -30 °C. Precipitation runoff from Portal Peak drains into the

Bow River The headwaters of the Bow River in Alberta, Canada, start at the Bow Glacier and Bow Lake (Alberta), Bow Lake in Banff National Park in the Canadian Rockies, Canadian Rocky Mountains. The glacial stream that feeds Bow Lake (Alberta), Bow Lake ...

which is a tributary of the

Saskatchewan River The Saskatchewan River (Cree: , "swift flowing river") is a major river in Canada. It stretches about from where it is formed by the joining of the North Saskatchewan River and South Saskatchewan River just east of Prince Albert, Saskatchewan ...

Gallery

Bow Lake reflections (7897959788).jpg, Portal Peak centered with Mount Thompson to right

References

External links