Record · State

Guam: records in the National Inventory of Dams

Guam had 1 high-hazard record as of October 30, 2026, according to the National Inventory of Dams.

That is 52nd of 52 states and territories by high-hazard records. The NID holds 1 record for Guam in all.

Guam, October 2026

1
High-hazard records: October 2026; 52nd of 52 states and territories; 100.0% of the state’s 1 record. A hazard class is not a risk.; 1
Records in the inventory: October 2026; 52nd of 52 states and territories; separate structures recorded with a dam are included.; 1
High hazard, condition published: October 2026; 0 rated Poor or Unsatisfactory; the NID publishes no condition for 0 of the state’s 1 high-hazard record.

Records by hazard class

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The 1 record the NID holds for Guam, by the hazard class the responsible agency assigned, October 2026. A class is the consequence of a failure, not its likelihood.
Hazard class	Records	Share of Guam’s records
High	1	100.0%
Significant	0	0.0%
Low	0	0.0%
Undetermined	0	0.0%

Condition of the high-hazard records

The NID publishes a condition for 1 of Guam’s 1 high-hazard record. A condition it does not publish is counted on its own line and never under a rating. Not Rated is the NID’s category for a record not inspected or not rated, and states rate their own dams, so these counts are not a comparison between states.

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Guam’s high-hazard records by the NID’s condition assessment, October 2026
Condition assessment	Records	Share of records with a condition published
Satisfactory	0	0.0%
Fair	1	100.0%
Poor	0	0.0%
Unsatisfactory	0	0.0%
Not Rated	0	0.0%
Not published: the condition assessment is not provided to the NID	0	not applicable
Not published: no condition assessment in the NID	0	not applicable

Counties of Guam in the inventory

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The 1 county of Guam that the NID names, most high-hazard records first; counties with the same count share a rank. A record the NID names no county for is in the state’s totals above and in no row here. County names are the NID’s.
County	High-hazard records	Records	Rank in the state by high-hazard records	High hazard, no condition published
Guam	1	1	1st	0

Compared with the states nearest in records

Each state or territory beside the one just above or below it by records in the inventory.

Guam and Puerto Rico

Sources

National Inventory of Dams — national CSV — U.S. Army Corps of Engineers, National Inventory of Dams · U.S. Government work · retrieved November 5, 2026

Compiled automatically from National Inventory of Dams — national CSV by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved November 5, 2026