US Bridges

SR91 NB Tpk 180.16 over Outfall Slough

Good

Indian River County, Florida · 13 MI S of SR 60 · Structure no. 880067

Built
1963
62 years old, rebuilt 1990
Condition
Good
inspected January 2024
Type
Slab
Prestressed Concrete
Length
82 ft
3 main spans
Daily traffic
18,350
2024 count
Owner
Toll Authority
State Toll Authority

About this bridge

SR91 NB Tpk 180.16 over Outfall Slough is a prestressed concrete slab carrying SR91 NB Tpk 180.16 over Outfall Slough in Indian River County, Florida. It was built in 1963 and reconstructed in 1990, so it is 62 years old, older than the Florida average of 41.3 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 18,350 vehicles a day, roughly 11% of them trucks, projected to reach 31,837 by 2042. The structure is 82 ft (25 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR91 NB Tpk 180.16
CrossesOutfall Slough
Location13 MI S of SR 60
RouteState Highway 91
StateFlorida
Coordinates27.55948, -80.76291
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 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 alignment8: Equal to present desirable criteria
Operating rating66.2 US tons
Inventory rating56.2 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20 + Mod
Structure length82 ft (25 m)
Longest span27 ft (8.3 m)
Deck width40 ft (12.1 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,350 (2024)
Projected traffic31,837 by 2042
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed1.2 mi (2 km)
TollOn a toll road
National Highway SystemYes

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 SR91 NB Tpk 180.16 over Outfall Slough built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1990.

What condition is SR91 NB Tpk 180.16 over Outfall Slough 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 January 2024.

How much traffic does SR91 NB Tpk 180.16 over Outfall Slough carry?

About 18,350 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is SR91 NB Tpk 180.16 over Outfall Slough?

The structure is 82 ft (25 m) long with a longest span of 27 ft (8.3 m) and a deck 40 ft wide.

Who owns SR91 NB Tpk 180.16 over Outfall Slough?

It is owned by the State Toll Authority.