US Bridges

Pr 431 KM 5 over Prieto River

Fair

Lares Municipio, Puerto Rico · 10 KM South West of Lares · Structure no. 020991

Built
1978
47 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
297 ft
3 main spans
Daily traffic
800
2017 count
Owner
State
State Highway Agency

About this bridge

Pr 431 KM 5 over Prieto River is a prestressed concrete stringer/multi-beam or girder carrying Pr 431 KM 5 over Prieto River in Lares Municipio, Puerto Rico. It was built in 1978, so it is 47 years old, younger 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 800 vehicles a day, roughly 2% of them trucks, projected to reach 1,000 by 2025. The structure is 297 ft (90.6 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesPr 431 KM 5
CrossesPrieto River
Location10 KM South West of Lares
RouteState Highway 431
CountyLares Municipio
StatePuerto Rico
Coordinates18.24737, -66.89083
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 12 months
Operating statusOpen, no 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating68.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length297 ft (90.6 m)
Longest span99 ft (30.3 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2017)
Projected traffic1,000 by 2025
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$2.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Pr 431 KM 5 over Prieto River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Pr 431 KM 5 over Prieto 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 February 2024.

How much traffic does Pr 431 KM 5 over Prieto River carry?

About 800 vehicles per day (2017 count), of which roughly 2% are trucks.

How long is Pr 431 KM 5 over Prieto River?

The structure is 297 ft (90.6 m) long with a longest span of 99 ft (30.3 m) and a deck 32 ft wide.

Who owns Pr 431 KM 5 over Prieto River?

It is owned by the State Highway Agency.