Record · State

Puerto Rico: records in the National Inventory of Dams

Puerto Rico had 36 high-hazard records as of October 30, 2026, according to the National Inventory of Dams.

That is 50th of 52 states and territories by high-hazard records. The NID holds 36 records for Puerto Rico in all.

Puerto Rico, October 2026

36
High-hazard records: October 2026; 50th of 52 states and territories; 100.0% of the state’s 36 records. A hazard class is not a risk.; 36
Records in the inventory: October 2026; 51st of 52 states and territories; separate structures recorded with a dam are included.; 36
High hazard, condition published: October 2026; 12 rated Poor or Unsatisfactory; the NID publishes no condition for 0 of the state’s 36 high-hazard records.

Records by hazard class

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The 36 records the NID holds for Puerto Rico, 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 Puerto Rico’s records
High	36	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 36 of Puerto Rico’s 36 high-hazard records. 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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Puerto Rico’s high-hazard records by the NID’s condition assessment, October 2026
Condition assessment	Records	Share of records with a condition published
Satisfactory	24	66.7%
Fair	0	0.0%
Poor	10	27.8%
Unsatisfactory	2	5.6%
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 Puerto Rico in the inventory

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The 22 counties of Puerto Rico 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
Adjuntas	5	5	1st
Ponce	4	4	2nd
Añasco	2	2	3rd
Comerío	2	2	3rd
Guayama	2	2	3rd
Isabela	2	2	3rd
Orocovis	2	2	3rd
Villalba	2	2	3rd
Yauco	2	2	3rd
Arecibo	1	1	10th
Cidra	1	1	10th
Fajardo	1	1	10th
Jayuya	1	1	10th
Juana Díaz	1	1	10th
Maricao	1	1	10th
Naguabo	1	1	10th
Patillas	1	1	10th
San Juan	1	1	10th
Santa Isabel	1	1	10th
Toa Alta	1	1	10th
Trujillo Alto	1	1	10th
Utuado	1	1	10th

Compared with the states nearest in records

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

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