US Bridges

SR 99-I 99 SB over T-361 and Trib Spring CR

Fair

Centre County, Pennsylvania · 1 MI E of State College · Structure no. 000000000041658

Built
2001
24 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
316 ft
2 main spans
Daily traffic
15,548
2024 count
Owner
State
State Highway Agency

About this bridge

SR 99-I 99 SB over T-361 and Trib Spring CR is a steel continuous stringer/multi-beam or girder carrying SR 99-I 99 SB over T-361 and Trib Spring CR in Centre County, Pennsylvania. It was built in 2001, so it is 24 years old, younger than the Pennsylvania average of 54.8 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 15,548 vehicles a day, roughly 14% of them trucks, projected to reach 19,294 by 2044. The structure is 316 ft (96.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 99-I 99 SB
CrossesT-361 and Trib Spring CR
Location1 MI E of State College
RouteInterstate 99
Coordinates40.83886, -77.83215
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating48 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length316 ft (96.3 m)
Longest span156 ft (47.5 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,548 (2024)
Projected traffic19,294 by 2044
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 99-I 99 SB over T-361 and Trib Spring CR built?

It was built in 2001, making it 24 years old in 2025.

What condition is SR 99-I 99 SB over T-361 and Trib Spring CR 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 SR 99-I 99 SB over T-361 and Trib Spring CR carry?

About 15,548 vehicles per day (2024 count), of which roughly 14% are trucks.

How long is SR 99-I 99 SB over T-361 and Trib Spring CR?

The structure is 316 ft (96.3 m) long with a longest span of 156 ft (47.5 m) and a deck 44 ft wide.

Who owns SR 99-I 99 SB over T-361 and Trib Spring CR?

It is owned by the State Highway Agency.