Triple

T6103818
Position Surface form Disambiguated ID Type / Status
Subject Hetch Hetchy Valley E136067 entity
Predicate hasPart P35 FINISHED
Object Hetch Hetchy Reservoir
Hetch Hetchy Reservoir is a man-made lake in California’s Sierra Nevada, created by damming the Tuolumne River to supply water and hydroelectric power to the San Francisco Bay Area.
 E136067 NE FINISHED

Named-entity recognition

Before disambiguation, gpt-5-mini classified whether the object phrase is a named entity — the step behind the object's NE type shown above.

Instruction
Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).
Input
Phrase: Hetch Hetchy Reservoir | Statement: [Hetch Hetchy Valley, hasPart, Hetch Hetchy Reservoir]

Disambiguation candidates (2 decisions)

The exact options the model was shown at each disambiguation step, with the option it chose highlighted — the evidence behind this triple's disambiguated ids.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Hetch Hetchy Reservoir
Context triple: [Hetch Hetchy Valley, hasPart, Hetch Hetchy Reservoir]
  • A. Pepacton Reservoir
    Pepacton Reservoir is a large man-made lake in the Catskill Mountains of New York that serves as a major component of New York City's drinking water supply system.
  • B. Hetch Hetchy Regional Water System
    The Hetch Hetchy Regional Water System is a major water supply and delivery network that provides high-quality drinking water from Sierra Nevada sources to San Francisco and numerous Bay Area communities.
  • C. Hetch Hetchy Valley
    Hetch Hetchy Valley is a glacially carved valley in Yosemite National Park, California, best known for its scenic granite cliffs and for being largely submerged by the Hetch Hetchy Reservoir that supplies water to the San Francisco Bay Area.
  • D. Calaveras Reservoir
    Calaveras Reservoir is a major water storage reservoir in California’s Diablo Range that supplies drinking water to the San Francisco Bay Area.
  • E. Pardee Reservoir
    Pardee Reservoir is a man-made lake in the Sierra Nevada foothills of California that serves as a major water storage and supply source for the East Bay region.
  • 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: Hetch Hetchy Reservoir
Target entity description: Hetch Hetchy Reservoir is a man-made lake in California’s Sierra Nevada, created by damming the Tuolumne River to supply water and hydroelectric power to the San Francisco Bay Area.
  • A. Pepacton Reservoir
    Pepacton Reservoir is a large man-made lake in the Catskill Mountains of New York that serves as a major component of New York City's drinking water supply system.
  • B. Hetch Hetchy Regional Water System
    The Hetch Hetchy Regional Water System is a major water supply and delivery network that provides high-quality drinking water from Sierra Nevada sources to San Francisco and numerous Bay Area communities.
  • C. Hetch Hetchy Valley chosen
    Hetch Hetchy Valley is a glacially carved valley in Yosemite National Park, California, best known for its scenic granite cliffs and for being largely submerged by the Hetch Hetchy Reservoir that supplies water to the San Francisco Bay Area.
  • D. Calaveras Reservoir
    Calaveras Reservoir is a major water storage reservoir in California’s Diablo Range that supplies drinking water to the San Francisco Bay Area.
  • E. Pardee Reservoir
    Pardee Reservoir is a man-made lake in the Sierra Nevada foothills of California that serves as a major water storage and supply source for the East Bay region.
  • F. None of above.

How the object was described

The object's one-sentence description was generated by prompting gpt-5.1 with the object name and this triple as context.

Instruction
Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"
Input
Entity: Hetch Hetchy Reservoir
Triple: [Hetch Hetchy Valley, hasPart, Hetch Hetchy Reservoir]
Generated description
Hetch Hetchy Reservoir is a man-made lake in California’s Sierra Nevada, created by damming the Tuolumne River to supply water and hydroelectric power to the San Francisco Bay Area.

Provenance (5 batches)

Stage Batch ID Job type Status
creating batch_69c0087dee9881909e3655be88208c01 elicitation completed
NER batch_69c05b3dbc6c8190b9e3d81e6ca9eeb8 ner completed
NED1 batch_69c16eb7a0548190ab661b0e68a4ef47 ned_source_triple completed
NED2 batch_69c1c14d07848190868e6069307da7aa ned_description completed
NEDg batch_69c1c07cb6f481909cedcaa14b991b74 nedg completed
Created at: March 22, 2026, 4:13 p.m.