Vadret da Morteratsch

IceIce lost since 1850This glacier

Past extents come from the Swiss Glacier Inventories of 1850, 1931, 1973 and 2016. Future extents are illustrative: each glacier’s projected area (OGGM, median of CMIP6 climate models) is removed from its lowest ice upward. About the scenarios.

Inventory 14.93km² Area in 2016 · ±0% compared with 2016

Area 201614.93km²7th largest

Elevation2,032–4,006mmedian 3,011 m

Length7.0kmfaces north

Area since 1850−22%19.26 km² in 1850

Tongue since 1878−3,059m137 measurements

Thinning 1850–2022−61maverage surface lowering

Ice left in 210017%of 2020 volume, SSP2-4.5

Vadret da Morteratsch is the 7th-largest glacier in Switzerland, covering 14.93 km² in the canton of Graubünden. Its ice spans 2,032 to 4,006 m and faces north. Its meltwater drains to the Inn and on to the Black Sea. In 1850, at the end of the Little Ice Age, it covered 19.26 km²; by 2016 it had lost 22% of that area. Its tongue has been measured 137 times since 1878. In total it has retreated 3,059 m, about 21.0 m a year. Between 1850 and 2022 its surface dropped by 61 m on average. With strong climate protection (SSP1-2.6), about 36% of its 2020 ice would remain in 2100. With very high emissions (SSP5-8.5) it would be gone around 2092. Its meltwater peaked around 2020.

Pictures

Then and now

Around 1890–1900. Photochrom print, Library of Congress. Photochrom Print Collection · Public domain · Wikimedia Commons

Vadret da Morteratsch in 2007. Andreas Handschin · CC BY-SA 2.0 · Wikimedia Commons

Future

What remains in 2100

SSP1-2.6 · low emissions36%48% left in 2050

SSP2-4.5 · intermediate emissions17%46% left in 2050

SSP3-7.0 · high emissions5%41% left in 2050

SSP5-8.5 · very high emissionsGoneIce gone around 2092

SSP1-2.6SSP2-4.5SSP3-7.0SSP5-8.5

Ice volume as a share of 2020, median of 14 climate models; shaded: middle two-thirds of models. OGGM v1.6.

Meltwater

Million m³ of water per year, 11-year mean

Water leaving the glacier area each year: ice melt, snowmelt and rain. It rises while the glacier melts faster, then falls as the ice runs out: “peak water”.

Measured

The record

Length change since 1878

Position of the glacier tongue, measured in the field almost every year. Hover for each measurement.

GLAMOS Swiss Glacier Length Change, release 2025.

Thinning since 1850

Average change in surface height, from comparing elevation models made from maps, aerial images and laser scans.

GLAMOS Swiss Glacier Volume Change, release 2025.

Profile

Facts

Area over time

Past areas are the ice body this glacier belonged to at the time. Projections: OGGM median, SSP2-4.5.

SGI id: E22-03
Canton: Graubünden
River: Inn → Black Sea
Basin: Inn
Location: 46.3833° N, 9.9264° E · swisstopo map
Elevation: 2,032–4,006 m, median 3,011 m
Slope, aspect: 22°, north
Debris cover: 1.62 km² (11% of the area)
Inventory image: 2015
Ice volume (model): ≈ 0.915 km³ in 2020 (OGGM)
RGI ids: RGI60-11.01946, RGI60-11.02120, RGI60-11.02127, RGI60-11.02138

Nearby

More in the Inn basin

All glaciers in this basin →

Sources

Linsbauer et al. (2021). The new Swiss Glacier Inventory SGI2016. Frontiers in Earth Science 9. doi.org/10.3389/feart.2021.704189
Mannerfelt et al. (2022). Halving of Swiss glacier volume since 1931 observed from terrestrial image photogrammetry. The Cryosphere 16. doi.org/10.5194/tc-16-3249-2022
GLAMOS – Glacier Monitoring Switzerland. www.glamos.ch
Zekollari et al. (2024). Twenty-first century global glacier evolution under CMIP6 scenarios and the role of glacier-specific observations. The Cryosphere 18 (OGGM v1.6 projections). tc.copernicus.org/articles/18/5045/2024/

Relief: swisstopo swissALTIRegio. 1850 and 1973 outlines: Maisch et al. (2000), Müller et al. (1976), Paul (2004). Length, mass balance and volume change: GLAMOS releases 2025. All sources and methods.

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