US Bridges

SR 120-PA 120 over Iron Run

Fair

Elk County, Pennsylvania · City of ST Marys · Structure no. 000000000015525

Built
1949
76 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
28 ft
1 main span
Daily traffic
4,741
2024 count
Owner
State
State Highway Agency

About this bridge

SR 120-PA 120 over Iron Run is a concrete culvert carrying SR 120-PA 120 over Iron Run in Elk County, Pennsylvania. It was built in 1949, so it is 76 years old, older 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 4,741 vehicles a day, roughly 7% of them trucks, projected to reach 6,135 by 2044. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 26.7 mi (43 km).

Location

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CarriesSR 120-PA 120
CrossesIron Run
LocationCity of ST Marys
RouteState Highway 120
CountyElk County
StatePennsylvania
Coordinates41.42246, -78.56842
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83 US tons
Inventory rating49.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span28 ft (8.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,741 (2024)
Projected traffic6,135 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 120-PA 120 over Iron Run built?

It was built in 1949, making it 76 years old in 2025.

What condition is SR 120-PA 120 over Iron Run 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 May 2024.

How much traffic does SR 120-PA 120 over Iron Run carry?

About 4,741 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is SR 120-PA 120 over Iron Run?

The structure is 28 ft (8.5 m) long with a longest span of 28 ft (8.5 m).

Who owns SR 120-PA 120 over Iron Run?

It is owned by the State Highway Agency.