US Bridges

Pr 431 4.1 KM over Blanco River

Fair

Lares Municipio, Puerto Rico · 4.1 KM from Int Pr 128 · Structure no. 027381

Built
1963
62 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
220 ft
22 main spans
Daily traffic
800
2017 count
Owner
State
State Highway Agency

About this bridge

Pr 431 4.1 KM over Blanco River is a prestressed concrete continuous stringer/multi-beam or girder carrying Pr 431 4.1 KM over Blanco River in Lares Municipio, Puerto Rico. It was built in 1963, so it is 62 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 6 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 4% of them trucks, projected to reach 1,000 by 2025. The structure is 220 ft (67.1 m) long and 38 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesPr 431 4.1 KM
CrossesBlanco River
Location4.1 KM from Int Pr 128
RouteState Highway 431
CountyLares Municipio
StatePuerto Rico
Coordinates18.24759, -66.88543
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating67.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans22
Design loadHS 20 + Mod
Structure length220 ft (67.1 m)
Longest span101 ft (30.7 m)
Deck width38 ft (11.6 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2017)
Projected traffic1,000 by 2025
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Pr 431 4.1 KM over Blanco River built?

It was built in 1963, making it 62 years old in 2025.

What condition is Pr 431 4.1 KM over Blanco 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 July 2024.

How much traffic does Pr 431 4.1 KM over Blanco River carry?

About 800 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Pr 431 4.1 KM over Blanco River?

The structure is 220 ft (67.1 m) long with a longest span of 101 ft (30.7 m) and a deck 38 ft wide.

Who owns Pr 431 4.1 KM over Blanco River?

It is owned by the State Highway Agency.