US Bridges

Pr 18 Nobd 4.50 KM over Pr 21 1.20 KM

Fair

San Juan Municipio, Puerto Rico · 5.8 KM N E of Guaynabo · Structure no. 009582

Built
1965
60 years old, rebuilt 1978
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
251 ft
4 main spans
Daily traffic
119,500
2017 count
Owner
State
State Highway Agency

About this bridge

Pr 18 Nobd 4.50 KM over Pr 21 1.20 KM is a prestressed concrete stringer/multi-beam or girder carrying Pr 18 Nobd 4.50 KM over Pr 21 1.20 KM in San Juan Municipio, Puerto Rico. It was built in 1965 and reconstructed in 1978, so it is 60 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 119,500 vehicles a day, roughly 7% of them trucks, projected to reach 136,250 by 2025. The structure is 251 ft (76.5 m) long and 78 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesPr 18 Nobd 4.50 KM
CrossesPr 21 1.20 KM
Location5.8 KM N E of Guaynabo
RouteInterstate 18
CountySan Juan Municipio
StatePuerto Rico
Coordinates18.38943, -66.07167
Functional classUrban Principal Arterial - Interstate

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.2 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length251 ft (76.5 m)
Longest span88 ft (26.8 m)
Deck width78 ft (23.8 m)
Roadway width76 ft (23.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic119,500 (2017)
Projected traffic136,250 by 2025
Trucks7%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$3.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Pr 18 Nobd 4.50 KM over Pr 21 1.20 KM built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1978.

What condition is Pr 18 Nobd 4.50 KM over Pr 21 1.20 KM 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 18 Nobd 4.50 KM over Pr 21 1.20 KM carry?

About 119,500 vehicles per day (2017 count), of which roughly 7% are trucks.

How long is Pr 18 Nobd 4.50 KM over Pr 21 1.20 KM?

The structure is 251 ft (76.5 m) long with a longest span of 88 ft (26.8 m) and a deck 78 ft wide.

Who owns Pr 18 Nobd 4.50 KM over Pr 21 1.20 KM?

It is owned by the State Highway Agency.