US Bridges

Pr 861 over LA Plata River

PoorPosted for load

Toa Alta Municipio, Puerto Rico · 1 KM South of Toa Alta · Structure no. 016571

Built
1979
46 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
388 ft
4 main spans
Daily traffic
14,400
2017 count
Owner
State
State Highway Agency

About this bridge

Pr 861 over LA Plata River is a prestressed concrete stringer/multi-beam or girder carrying Pr 861 over LA Plata River in Toa Alta Municipio, Puerto Rico. It was built in 1979, so it is 46 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 14,400 vehicles a day, roughly 4% of them trucks, projected to reach 18,700 by 2025. The structure is 388 ft (118.3 m) long and 50 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

CarriesPr 861
CrossesLA Plata River
Location1 KM South of Toa Alta
RouteState Highway 861
Coordinates18.38333, -66.24918
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load 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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37 US tons
Inventory rating22.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length388 ft (118.3 m)
Longest span94 ft (28.6 m)
Deck width50 ft (15.1 m)
Roadway width47 ft (14.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,400 (2017)
Projected traffic18,700 by 2025
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed4.3 mi (7 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$893,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Pr 861 over LA Plata River built?

It was built in 1979, making it 46 years old in 2025.

What condition is Pr 861 over LA Plata River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does Pr 861 over LA Plata River carry?

About 14,400 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Pr 861 over LA Plata River?

The structure is 388 ft (118.3 m) long with a longest span of 94 ft (28.6 m) and a deck 50 ft wide.

Who owns Pr 861 over LA Plata River?

It is owned by the State Highway Agency.