Mount St. Helens

E11819

active volcano mountain natural landmark stratovolcano

Mount St. Helens is an active stratovolcano in Washington State, USA, best known for its catastrophic 1980 eruption that dramatically reshaped its summit and surrounding landscape.

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All labels observed (9)

Label	Occurrences
Mount St. Helens canonical	41
Mount St. Helens National Volcanic Monument	16
1980 eruption of Mount St. Helens	2
Mount Saint Helens	1
Mount St. Helens 1980 eruption	1
Mount St. Helens area	1
Mount St. Helens volcanic system	1
Mount St. Helens volcano	1
crater of Mount St. Helens	1

How this entity was disambiguated

This entity first appeared as the object of triple T111072 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Mount St. Helens
Context triple: [Cascade Volcanic Arc, hasVolcano, Mount St. Helens]

A. Kamchatka volcanic arc
The Kamchatka volcanic arc is a highly active chain of volcanoes on Russia’s Kamchatka Peninsula, known for its frequent eruptions, numerous stratovolcanoes, and significant role in global volcanism and tectonics.
B. Nevada Fall
Nevada Fall is a prominent and picturesque waterfall on the Merced River in Yosemite National Park, known for its powerful drop and dramatic granite surroundings.
C. Mount Lyell
Mount Lyell is a prominent, glacier-clad peak in the Sierra Nevada of California, renowned as the tallest mountain in Yosemite National Park and a popular destination for experienced climbers.
D. Half Dome
Half Dome is a famous granite rock formation in California known for its distinctive sheer face and popular but strenuous hiking and climbing routes.
E. Mount Hood National Forest
Mount Hood National Forest is a vast federally managed forest in northern Oregon centered around the volcanic peak of Mount Hood, offering extensive outdoor recreation, scenic drives, and diverse mountain and forest ecosystems.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Mount St. Helens
Target entity description: Mount St. Helens is an active stratovolcano in Washington State, USA, best known for its catastrophic 1980 eruption that dramatically reshaped its summit and surrounding landscape.

A. Kamchatka volcanic arc
The Kamchatka volcanic arc is a highly active chain of volcanoes on Russia’s Kamchatka Peninsula, known for its frequent eruptions, numerous stratovolcanoes, and significant role in global volcanism and tectonics.
B. Nevada Fall
Nevada Fall is a prominent and picturesque waterfall on the Merced River in Yosemite National Park, known for its powerful drop and dramatic granite surroundings.
C. Mount Lyell
Mount Lyell is a prominent, glacier-clad peak in the Sierra Nevada of California, renowned as the tallest mountain in Yosemite National Park and a popular destination for experienced climbers.
D. Gakkel Ridge
Gakkel Ridge is a slow-spreading mid-ocean ridge located beneath the Arctic Ocean, forming the tectonic boundary between the North American and Eurasian plates.
E. Half Dome
Half Dome is a famous granite rock formation in California known for its distinctive sheer face and popular but strenuous hiking and climbing routes.
F. None of above. chosen

Statements (50)

Predicate	Object
instanceOf	active volcano ⓘ mountain ⓘ natural landmark ⓘ stratovolcano ⓘ
1980AshPlumeHeight	about 15 miles ⓘ about 24 kilometers ⓘ
1980Casualties	57 people killed ⓘ
1980Landslide	largest debris avalanche in recorded history ⓘ
1980LateralBlastDirection	north ⓘ
composition	andesitic to dacitic lava ⓘ
country	United States ⓘ linked to: United States of America
discoveredByEuropeans	George Vancouver ⓘ
distanceToPortland	about 50 miles (80 km) northeast ⓘ
distanceToSeattle	about 96 miles (155 km) south ⓘ
elevation	approximately 2549 meters ⓘ approximately 8363 feet ⓘ
eruptionVEI	VEI 5 (1980 eruption) ⓘ
firstRecordedEuropeanSighting	1792 ⓘ
geologicalAge	Holocene ⓘ
glacier	Crater Glacier ⓘ
governedBy	United States Forest Service ⓘ linked to: U.S. Forest Service
lastEruption	2004–2008 ⓘ
locatedIn	Cascade Range ⓘ Pacific Northwest ⓘ Skamania County, Washington, United States ⓘ linked to: Skamania County, Washington Washington State ⓘ linked to: Washington
majorEruption	May 18, 1980 ⓘ
monitoringAgency	Cascades Volcano Observatory ⓘ linked to: USGS Cascades Volcano Observatory United States Geological Survey ⓘ
namedAfter	Alleyne Fitzherbert, 1st Baron St Helens ⓘ
nearestMajorCity	Portland, Oregon ⓘ linked to: Portland, Oregon, United States Seattle, Washington ⓘ linked to: Seattle, Washington, United States
notableFeature	extensive blast zone to the north ⓘ lava dome complex in the crater ⓘ rapid post-1980 ecological succession ⓘ
partOf	Cascade Volcanic Arc ⓘ Pacific Ring of Fire ⓘ
pre1980Elevation	2950 meters ⓘ 9677 feet ⓘ
prominence	approximately 1340 meters ⓘ
protectedAreaDesignationYear	1982 ⓘ
region	Pacific Northwest of the United States ⓘ linked to: Pacific Northwest
state	Washington ⓘ
summitCrater	horseshoe-shaped crater open to the north ⓘ
volcanicHazards	ashfall ⓘ lahars ⓘ lava domes ⓘ pyroclastic flows ⓘ
volcanoType	stratovolcano ⓘ
withinProtectedArea	Mount St. Helens National Volcanic Monument ⓘ linked to: Mount St. Helens

How these facts were elicited

Referenced by (65)

Full triples — surface form annotated when it differs from this entity's canonical label.

Cascade Volcanic Arc → hasVolcano → Mount St. Helens ⓘ

Mount St. Helens → withinProtectedArea → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Skamania County, Washington → contains → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Cascade Range → notablePeak → Mount St. Helens ⓘ

Cascade Range → containsProtectedArea → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Washington → contains → Mount St. Helens ⓘ

St. Helens, Oregon → namedAfter → Mount St. Helens ⓘ

Cowlitz County, Washington → locatedNear → Mount St. Helens ⓘ

Bezymianny → similarTo → Mount St. Helens 1980 eruption ⓘ

linked to: Mount St. Helens

Southwest Washington → containsMountain → Mount St. Helens ⓘ

Southwest Washington → containsNationalVolcanicMonument → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Battle Ground, Washington → nearbyAttraction → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

USGS Cascades Volcano Observatory → monitors → Mount St. Helens ⓘ

Crater Glacier → locatedIn → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Crater Glacier → namedAfter → crater of Mount St. Helens ⓘ

linked to: Mount St. Helens

Crater Glacier → partOf → Mount St. Helens volcanic system ⓘ

linked to: Mount St. Helens

Crater Glacier → surfaceFeatureOf → Mount St. Helens ⓘ

High Cascades → contains → Mount St. Helens ⓘ

Lewis River → flowsNear → Mount St. Helens ⓘ

Bezymianny volcano → similarTo → Mount St. Helens ⓘ

Silver Lake, Washington → locatedNear → Mount St. Helens ⓘ

Silver Lake, Washington → accessRouteTo → Mount St. Helens ⓘ

Silver Lake, Washington → locatedWestOf → Mount St. Helens ⓘ

Silver Lake, Washington → hasNearbyProtectedArea → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Pittock Mansion → viewOf → Mount St. Helens ⓘ

Woodland, Washington → locatedNear → Mount St. Helens ⓘ

Woodland, Washington → isGatewayTo → Mount St. Helens area ⓘ

linked to: Mount St. Helens

Carson, Washington → locatedNear → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Castle Rock, Washington → locatedNear → Mount St. Helens ⓘ

Castle Rock, Washington → isGatewayTo → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Castle Rock, Washington → hasNearbyAttraction → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Cascades Volcano Observatory → monitors → Mount St. Helens ⓘ

subject linked to: CVO

Toutle, Washington → locatedNear → Mount St. Helens ⓘ

Toutle, Washington → locatedWestOf → Mount St. Helens ⓘ

Toutle, Washington → hasNearbyAttraction → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Toutle, Washington → hasNearbyVolcano → Mount St. Helens ⓘ

Yacolt Burn State Forest → hasViewOf → Mount St. Helens ⓘ

Washington (state) → contains → Mount St. Helens ⓘ

subject linked to: Washington State, United States

Cascade Range volcanic province → contains → Mount St. Helens ⓘ

Cougar, Washington → locatedNear → Mount St. Helens ⓘ

Cougar, Washington → hasNearbyAttraction → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

State Route 504 → providesAccessTo → Mount St. Helens ⓘ

State Route 504 → providesAccessTo → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

State Route 504 → isTouristCorridorFor → Mount St. Helens National Volcanic Monument ⓘ

linked to: Mount St. Helens

Cooper Spur → offersViewOf → Mount St. Helens ⓘ

Cowlitz Indian Tribe → hasCulturalTieTo → Mount St. Helens ⓘ

Barry Voight → hasWorkedOn → Mount St. Helens volcano ⓘ

linked to: Mount St. Helens

Cooper Spur area → hasViewOf → Mount St. Helens ⓘ

Cascade Mountains of Washington → contains → Mount St. Helens ⓘ

Cascade Mountains of Washington → majorVolcano → Mount St. Helens ⓘ

All labels observed (9)

How this entity was disambiguated Show

Statements (50)

How these facts were elicited Show

Referenced by (65)

How this entity was disambiguated

How these facts were elicited