US Bridges

Pr 31 2.9 KM over Santiago River

Fair

Naguabo Municipio, Puerto Rico · North East of Naguabo · Structure no. 001951

Built
1949
76 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
98 ft
9 main spans
Daily traffic
5,700
2017 count
Owner
State
State Highway Agency

About this bridge

Pr 31 2.9 KM over Santiago River is a concrete culvert carrying Pr 31 2.9 KM over Santiago River in Naguabo Municipio, Puerto Rico. It was built in 1949, so it is 76 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: open, posting recommended but not legally implemented.

It carries about 5,700 vehicles a day, roughly 4% of them trucks, projected to reach 7,800 by 2025. The structure is 98 ft (29.9 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesPr 31 2.9 KM
CrossesSantiago River
LocationNorth East of Naguabo
RouteState Highway 31
CountyNaguabo Municipio
StatePuerto Rico
Coordinates18.21396, -65.7306
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusOpen, posting recommended but not legally implemented
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.7 US tons
Inventory rating19.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans9
Design loadH 20
Structure length98 ft (29.9 m)
Longest span10 ft (3.1 m)
Deck width37 ft (11.3 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2017)
Projected traffic7,800 by 2025
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$102,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Pr 31 2.9 KM over Santiago River built?

It was built in 1949, making it 76 years old in 2025.

What condition is Pr 31 2.9 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 March 2024.

How much traffic does Pr 31 2.9 KM over Santiago River carry?

About 5,700 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Pr 31 2.9 KM over Santiago River?

The structure is 98 ft (29.9 m) long with a longest span of 10 ft (3.1 m) and a deck 37 ft wide.

Who owns Pr 31 2.9 KM over Santiago River?

It is owned by the State Highway Agency.