Edwards Dam (removed)
E295087
Edwards Dam was a former hydroelectric dam on Maine’s Kennebec River that became nationally notable when it was removed in 1999 to restore the river’s ecosystem and fish migration.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Edwards Dam (removed) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2749264 — 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: Edwards Dam (removed) Context triple: [Kennebec River, hasDam, Edwards Dam (removed)]
-
A.
Norris Dam
Norris Dam is a Tennessee Valley Authority hydroelectric dam on the Clinch River in eastern Tennessee, notable as TVA’s first major dam project and a key component of regional flood control and power generation.
-
B.
Denison Dam
Denison Dam is a large earthen dam on the Red River between Texas and Oklahoma, built for flood control, hydroelectric power generation, and water supply.
-
C.
Conklingville Dam
Conklingville Dam is a concrete gravity dam in New York that created the Great Sacandaga Lake reservoir for flood control and hydroelectric power generation.
-
D.
Keystone Dam
Keystone Dam is a major flood-control and hydroelectric dam in northeastern Oklahoma that forms Keystone Lake on the Arkansas River.
-
E.
Watertown Dam
Watertown Dam is a historic low-head dam on the Charles River in Watertown, Massachusetts, that once powered local industry and now helps regulate river flow and fish passage.
- 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: Edwards Dam (removed) Target entity description: Edwards Dam was a former hydroelectric dam on Maine’s Kennebec River that became nationally notable when it was removed in 1999 to restore the river’s ecosystem and fish migration.
-
A.
Norris Dam
Norris Dam is a Tennessee Valley Authority hydroelectric dam on the Clinch River in eastern Tennessee, notable as TVA’s first major dam project and a key component of regional flood control and power generation.
-
B.
Denison Dam
Denison Dam is a large earthen dam on the Red River between Texas and Oklahoma, built for flood control, hydroelectric power generation, and water supply.
-
C.
Conklingville Dam
Conklingville Dam is a concrete gravity dam in New York that created the Great Sacandaga Lake reservoir for flood control and hydroelectric power generation.
-
D.
Keystone Dam
Keystone Dam is a major flood-control and hydroelectric dam in northeastern Oklahoma that forms Keystone Lake on the Arkansas River.
-
E.
Watertown Dam
Watertown Dam is a historic low-head dam on the Charles River in Watertown, Massachusetts, that once powered local industry and now helps regulate river flow and fish passage.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
former dam
ⓘ
hydroelectric dam ⓘ |
| afterRemoval |
improved water quality
ⓘ
restoration of free-flowing conditions on the Kennebec River in Augusta ⓘ return of migratory fish to upstream reaches ⓘ |
| constructionStartDate | 1834 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crosses | Kennebec River ⓘ |
| demolitionMethod | breaching of dam structure ⓘ |
| environmentalImpact |
altered natural flow of the Kennebec River
ⓘ
blocked access to historic spawning habitat for migratory fish ⓘ |
| FERCDecision | ordered removal after license denial ⓘ |
| FERCOrderDate | 1997 ⓘ |
| fishMigrationBlocked |
Atlantic salmon
ⓘ
alewife ⓘ shad ⓘ striped bass ⓘ sturgeon ⓘ |
| height |
24 ft
ⓘ
7 m ⓘ |
| historicalUse |
hydroelectric generation in the 20th century
ⓘ
powering sawmills ⓘ powering textile mills ⓘ |
| length |
280 m
ⓘ
917 ft ⓘ |
| locatedIn |
Augusta, Maine
ⓘ
Kennebec County, Maine ⓘ Maine ⓘ |
| locatedNear | downtown Augusta, Maine ⓘ |
| locatedOnRiver | Kennebec River ⓘ |
| locatedUpstreamOf | Merrymeeting Bay ⓘ |
| mediaCoverage | received national attention for dam removal decision ⓘ |
| nearbyCity | Augusta, Maine ⓘ |
| notableFor |
being one of the first major hydroelectric dams in the United States removed primarily for environmental reasons
ⓘ
restoration of fish migration on the Kennebec River ⓘ |
| openingDate | 1837 ⓘ |
| operator | Edwards Manufacturing Company ⓘ |
| ownedBy | Edwards Manufacturing Company ⓘ |
| partOf | Kennebec River restoration efforts ⓘ |
| purpose |
hydroelectric power generation
ⓘ
water power for mills ⓘ |
| regulator | Federal Energy Regulatory Commission ⓘ |
| removalDate | 1999-07-01 ⓘ |
| removalReason |
ecosystem restoration
ⓘ
public interest determination by federal regulators ⓘ restoration of anadromous fish runs ⓘ |
| removed | 1999 ⓘ |
| riverMouthUpstreamDistance | 27 miles from the mouth of the Kennebec River ⓘ |
| status | removed ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Edwards Dam (removed) Description of subject: Edwards Dam was a former hydroelectric dam on Maine’s Kennebec River that became nationally notable when it was removed in 1999 to restore the river’s ecosystem and fish migration.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.