US Bridges

Pr 971 3.65 KM over Santiago River

FairPosted for load

Naguabo Municipio, Puerto Rico · 3.5 KM North of Naguabo · Structure no. 006951

Built
1954
71 years old, rebuilt 1979
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
20 ft
1 main span
Daily traffic
3,600
2017 count
Owner
State
State Highway Agency

About this bridge

Pr 971 3.65 KM over Santiago River is a concrete slab carrying Pr 971 3.65 KM over Santiago River in Naguabo Municipio, Puerto Rico. It was built in 1954 and reconstructed in 1979, so it is 71 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. Its operating status is: posted for load restriction.

It carries about 3,600 vehicles a day, roughly 4% of them trucks, projected to reach 5,200 by 2025. The structure is 20 ft (6.1 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesPr 971 3.65 KM
CrossesSantiago River
Location3.5 KM North of Naguabo
RouteState Highway 971
CountyNaguabo Municipio
StatePuerto Rico
Coordinates18.23528, -65.73736
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating44.9 US tons
Inventory rating26.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width24 ft (7.2 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,600 (2017)
Projected traffic5,200 by 2025
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$158,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Pr 971 3.65 KM over Santiago River built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1979.

What condition is Pr 971 3.65 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 October 2024.

How much traffic does Pr 971 3.65 KM over Santiago River carry?

About 3,600 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Pr 971 3.65 KM over Santiago River?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 24 ft wide.

Who owns Pr 971 3.65 KM over Santiago River?

It is owned by the State Highway Agency.