Glacial Valleys

Glacial Valleys (HM1663)

Location: CRATER LAKE, OR 97604 Klamath County
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Country: United States of America
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N 42° 54.696', W 122° 8.76'

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Crater Lake National Park

The collapsed volcano that now holds Crater Lake once stood more than a mile (1.6 km) above the present lake level. Called Mt. Mazama, this massive mountain of overlapping cones was high enough to support a cap of snow all year. During the Ice Age, snow often blanked the entire mountain—more snow than the summer sun could melt. The accumulated snow compacted to form glaciers, sluggish rivers of ice that carved out broad valleys as they inched down the slopes.

Eventually, the ice in the valleys melted. When the top of Mt. Mazama caved in about 7,700 years ago, the upper portions of the valleys collapsed with it. Today, you can see the remains of two "U" shaped glacial valleys on the caldera wall across the lake, Kerr Notch (left) an Sun Notch (right).

Graphic Illustrations:
1. Alternating eruptions of lava and cinders built Mt. Mazama to its maximum height.

2. Glaziers formed on the upper slopes, growing larger during the Ice Age.

3. Climatic changes and more eruptions melted the glaciers, exposing the excavated valleys.

4. The collapse of Mt. Mazama truncated the glacial valleys, leaving "notches" still visible today.
HM NumberHM1663
Placed ByNational Park Service, U.S. Department of the Interior
Marker ConditionNo reports yet
Date Added Wednesday, October 22nd, 2014 at 3:24am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)10T E 569708 N 4751351
Decimal Degrees42.91160000, -122.14600000
Degrees and Decimal MinutesN 42° 54.696', W 122° 8.76'
Degrees, Minutes and Seconds42° 54' 41.76" N, 122° 8' 45.60" W
Driving DirectionsGoogle Maps
Area Code(s)541
Closest Postal AddressAt or near 25 Rim Dr, CRATER LAKE OR 97604, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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