US Bridges

PR-18 over PR-21

Good

San Juan Municipio, Puerto Rico · PR18 KM 4.2 · Structure no. 030941

Built
2020
5 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
229 ft
2 main spans
Daily traffic
239,000
2017 count
Owner
State
State Highway Agency

About this bridge

PR-18 over PR-21 is a prestressed concrete box beam or girders - multiple carrying PR-18 over PR-21 in San Juan Municipio, Puerto Rico. It was built in 2020, so it is 5 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 239,000 vehicles a day, roughly 1% of them trucks, projected to reach 272,500 by 2025. The structure is 229 ft (69.7 m) long and 45 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesPR-18
CrossesPR-21
LocationPR18 KM 4.2
RouteState Highway 18
CountySan Juan Municipio
StatePuerto Rico
Coordinates18.38949, -66.07218
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.8 US tons
Inventory rating49.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length229 ft (69.7 m)
Longest span123 ft (37.4 m)
Deck width45 ft (13.7 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic239,000 (2017)
Projected traffic272,500 by 2025
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a toll 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was PR-18 over PR-21 built?

It was built in 2020, making it 5 years old in 2025.

What condition is PR-18 over PR-21 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does PR-18 over PR-21 carry?

About 239,000 vehicles per day (2017 count), of which roughly 1% are trucks.

How long is PR-18 over PR-21?

The structure is 229 ft (69.7 m) long with a longest span of 123 ft (37.4 m) and a deck 45 ft wide.

Who owns PR-18 over PR-21?

It is owned by the State Highway Agency.