US Bridges

Pr 971 2.0 KM over Santiago River

Fair

Naguabo Municipio, Puerto Rico · 1 KM North of Naguabo · Structure no. 005741

Built
1955
70 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
3,100
2017 count
Owner
State
State Highway Agency

About this bridge

Pr 971 2.0 KM over Santiago River is a steel stringer/multi-beam or girder carrying Pr 971 2.0 KM over Santiago River in Naguabo Municipio, Puerto Rico. It was built in 1955, so it is 70 years old, older than the Puerto Rico average of 51.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,100 vehicles a day, roughly 4% of them trucks, projected to reach 4,500 by 2025. The structure is 31 ft (9.4 m) long and 23 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesPr 971 2.0 KM
CrossesSantiago River
Location1 KM North of Naguabo
RouteState Highway 971
CountyNaguabo Municipio
StatePuerto Rico
Coordinates18.22282, -65.73091
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.7 US tons
Inventory rating34.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span31 ft (9.4 m)
Deck width23 ft (7.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2017)
Projected traffic4,500 by 2025
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$239,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Pr 971 2.0 KM over Santiago River built?

It was built in 1955, making it 70 years old in 2025.

What condition is Pr 971 2.0 KM over Santiago River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2024.

How much traffic does Pr 971 2.0 KM over Santiago River carry?

About 3,100 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Pr 971 2.0 KM over Santiago River?

The structure is 31 ft (9.4 m) long with a longest span of 31 ft (9.4 m) and a deck 23 ft wide.

Who owns Pr 971 2.0 KM over Santiago River?

It is owned by the State Highway Agency.