US Bridges

SR 99 - I 99 over SR 550-PA 550

Fair

Centre County, Pennsylvania · Bellefonte · Structure no. 000000000009221

Built
1972
53 years old, rebuilt 1997
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
140 ft
1 main span
Daily traffic
10,076
2024 count
Owner
State
State Highway Agency

About this bridge

SR 99 - I 99 over SR 550-PA 550 is a steel stringer/multi-beam or girder carrying SR 99 - I 99 over SR 550-PA 550 in Centre County, Pennsylvania. It was built in 1972 and reconstructed in 1997, so it is 53 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 10,076 vehicles a day, roughly 18% of them trucks, projected to reach 11,801 by 2044. The structure is 140 ft (42.7 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 99 - I 99
CrossesSR 550-PA 550
LocationBellefonte
RouteInterstate 99
CountyCentre County
StatePennsylvania
Coordinates40.91528, -77.74139
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span140 ft (42.7 m)
Deck width66 ft (20.1 m)
Roadway width62 ft (19 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,076 (2024)
Projected traffic11,801 by 2044
Trucks18%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$619,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 99 - I 99 over SR 550-PA 550 built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 1997.

What condition is SR 99 - I 99 over SR 550-PA 550 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 over SR 550-PA 550 carry?

About 10,076 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is SR 99 - I 99 over SR 550-PA 550?

The structure is 140 ft (42.7 m) long with a longest span of 140 ft (42.7 m) and a deck 66 ft wide.

Who owns SR 99 - I 99 over SR 550-PA 550?

It is owned by the State Highway Agency.