Required for each vehicle accessing the Many Glacier Valley from July 1 through September 8, 2024, 6 am to 3 pm.


Accessed via a separate entrance just west of the town of Babb, Many Glacier is a popular alternative to Going-to-the-Sun Road corridor. Being the confluence of four major valleys, two of which contain glaciers, this area offers spectacular views as well as some of the most famous landmarks and hikes in the park.


Access to this portion of the park includes driving a long dirt road to get to the Many Glacier Entrance.


Visitors with lodging, camping, or commercial activity reservations (e.g., boat tours and hotel reservations) beyond the Many Glacier Entrance can use proof of their reservation for entry instead of a vehicle reservation to gain access to the valley. See details below.

Trying to plan out our day in Juneau for next June... We plan to rent a car from Avis and get to Mendenhall as early as possible to try and beat the crowds that will come on the tour buses from the ships.. (There are currently 4 cruise ships scheduled to be in port that day.) We would also like to do a 3 hour whale watch tour with Jayleen's Alaska, but we don't know if we will have time, since the ship is supposed to be leaving at 5:00 pm, which means we need to be back onboard by 4:00. So we are trying to see how much time we need to allow for Mendenhall... including taking the Nugget Falls trail. For those who have been there.. how long did you stay? Thanks!


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Among the most dramatic evidence that Earth's climate is warming is the retreat and disappearance of mountain glaciers around the world. Based on preliminary data for 2019/2020, 2020 was the 33rd year in a row that glaciers tracked by the World Glacier Monitoring Service lost rather than gained ice.

Ice loss relative to 1970 for the glaciers in the World Glacier Monitoring Service's climate reference network. Glacier mass balance is the annual balance between how much snow accumulates on a glacier and how much ice is lost through melting, sublimation, or iceberg calving. Including the preliminary values for 2019-2020, these glaciers have lost a volume of ice equivalent to about 27.5 meters (90 feet) of water spread out over each glacier. NOAA Climate.gov image, based on data from the WGMS.

Glaciers that exist today are remnants of the last ice age. Thick sheets of ice advanced and retreated across most continents several times before withdrawing to the polar regions about 10,000 years ago. Continent-scale ice sheets still cover Greenland and Antarctica, while smaller ice caps and glaciers retreated to the world's high latitudes and mountains.

Roughly 20,000 years ago, during the Last Glacial Maximum of the Pleistocene Ice Age, ice spread over much of North America and Eurasia. (High-resolution without annotations available.) Image by Climate.gov based on data from the University of Zurich Applied Sciences, provided by Science on a Sphere.

Glaciers gain mass through snowfall and lose mass through melting and sublimation (when water evaporates directly from solid ice). Glaciers that terminate in a lake or the ocean also lose mass through iceberg calving. Those that end in the ocean are called tidewater glaciers, and they have more complex cycles of advance and retreat than glaciers that terminate on land, at least on annual and decades-long time scales. Even in a stable climate, such glaciers can experience periods of rapid retreat that are more influenced by seafloor topography and ocean circulation at their terminus than recent climate conditions.

Scientists have described more than one hundred thousand glaciers in the World Glacier Inventory, but only a small fraction of these have been consistently monitored for long enough to measure climate-related changes in their size or mass. Scientists refer to this global collection of about 40 glaciers as "climate reference" glaciers.

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A glacier is an accumulation of ice and snow that slowly flows over land. There are two main categories of glaciers: alpine glaciers and ice sheets. Alpine glaciers are frozen rivers of ice, slowly flowing under their own weight down mountainsides and into valleys. Unlike alpine glaciers, ice sheets, which exist only on Greenland and Antarctica, are unrestricted; they spread out in broad domes in multiple directions.

An ice sheet is a type of glacier. An ice sheet is a mass of glacial land ice extending more than 50,000 square kilometers (19,300 square miles). The two ice sheets on Earth today cover most of Greenland and Antarctica. During the last ice age, ice sheets also covered much of North America and Scandinavia.

An ice cap is a type of glacier, covering less than 50,000 square kilometers (20,000 square miles). Like ice sheets, ice caps tend to spread out in dome-like shapes as opposed to flowing down slopes. Ice caps form in high-latitude polar and subpolar mountain regions. Northern Europe is home to many ice caps; for example, the Vatnajkull ice cap in Iceland and the Austfonna ice cap in the Svalbard archipelago of Norway, which is the largest (in area) in Scandinavia. The largest ice cap in the world is the Severny Island ice cap, part of the Novaya Zemlya archipelago in the Russian Arctic.

An icefield is a a mass of glacier ice, somewhat similar to an ice cap, but usually smaller and lacking a dome-like shape. compared to an ice cap, an icefield is more strongly influenced by underlying terrain.

Icebergs are large floating chunks of ice, detached from a glacier, such as an alpine glacier or ice sheet, and carried out to the ocean. The word iceberg literally means ice mountain, berg borrowed from German.

Icebergs form when chunks of ice calve, or break off, from glaciers, ice shelves, or a larger iceberg. Icebergs travel with ocean currents, sometimes smashing up against the shore or getting caught in shallow waters.

Presently, 10 percent of land area on Earth is covered with glacial ice, including glaciers, ice caps, and the ice sheets of Greenland and Antarctica. Glacierized areas cover over 15 million square kilometers (5.8 million square miles).

During the maximum point of the last ice age, which ended about 12,000 years ago, glaciers covered about 32 percent of the total land area. The Antarctic continent has been at least partially covered by an ice sheet for the past 40 million years.

In the United States, glaciers currently cover over 90,000 square kilometers (35,000 square miles). Most of those glaciers are located in Alaska, which holds 87,000 square kilometers (34,000 square miles) of glacial ice.

The largest glacier, by area, is the Seller Glacier on the Antarctic Peninsula, measuring over 7,000 square kilometers (2,700 square miles). The largest ice crystals that make up a glacier can be as large as apples. However, there are many other ice masses on Earth that are much larger than the largest glacier. For example, glacier complexes such as icefields and ice caps can get as big as 80,000 square kilometers (31,000 square miles). Ice sheets such as the ones on Greenland and Antarctica are larger still. Greenland is 1.7 million square kilometers (656,400 square miles), and Antarctica is 1.23 million square kilometers (475,000 square miles). There are over 200,000 glaciers distinct from the ice sheets; and if all of these glaciers were to melt, they would increase sea level by just under half a meter (1.6 feet). If the entire Antarctic Ice Sheet melted, sea level would rise about 60 meters (197 feet). If the entire Greenland Ice Sheet melted, sea level would rise about 7.4 meters (24.3 feet).

Different measurements can determine the world's largest glaciers such its length, area, volume, or mass. Length and area are easily obtained from satellite imagery. Volume and mass are more difficult because thickness and density (for mass) cannot currently be calculated from satellites.

Outside Antarctica, the largest glaciers are Malaspina-Seward Glacier in Alaska with an area of 3,363 square kilometers (1,298 square miles), followed by Wykeham Glacier South in the Canadian Arctic with an area of 3,176 square kilometers (1,226 square miles), and then Bering Glacier in Alaska with an area of 3,025 square kilometers (1,168 square miles). Although Bering Glacier is the eighth largest glacier in the world by area, it is the longest in the world measuring 196 kilometers (122 miles) long.

There are over 200,000 glaciers distinct from the ice sheets; and if all of these glaciers were to melt, they would increase sea level by just under half a meter (1.6 feet). If the Greenland Ice Sheet were to melt, it would increase sea level by approximately 7.4 meters (24.3 feet); and if the Antarctic Ice Sheet were to melt, it would increase sea level by almost 60 meters (197 feet).

Glacial ice often appears blue when it has become very dense and free of bubbles. Years of compression gradually make the ice denser over time, forcing out the tiny air pockets between crystals. Ice absorbs a small amount of red light. When glacier ice becomes extremely dense, light travels deep into the ice before reflecting and refracting back out, leaving a bluish tint in the visible light. White glacier ice still has many tiny air bubbles in it, reflecting light much sooner before enough red light is noticeably absorbed. e24fc04721

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