US Bridges

Santiago RD over South Fork Montour Run

Good

Allegheny County, Pennsylvania · @ Inter. With SR 3070 · Structure no. 000000000001878

Built
1991
34 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
736
2024 count
Owner
State
State Highway Agency

About this bridge

Santiago RD over South Fork Montour Run is a concrete culvert carrying Santiago RD over South Fork Montour Run in Allegheny County, Pennsylvania. It was built in 1991, so it is 34 years old, younger than the Pennsylvania average of 54.8 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 736 vehicles a day, roughly 5% of them trucks, projected to reach 497 by 2032. The structure is 24 ft (7.3 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesSantiago RD
CrossesSouth Fork Montour Run
Location@ Inter. With SR 3070
RouteState Highway 0
Coordinates40.44196, -80.26294
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2023
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating38 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic736 (2024)
Projected traffic497 by 2032
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Santiago RD over South Fork Montour Run built?

It was built in 1991, making it 34 years old in 2025.

What condition is Santiago RD over South Fork Montour Run 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 February 2023.

How much traffic does Santiago RD over South Fork Montour Run carry?

About 736 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Santiago RD over South Fork Montour Run?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 36 ft wide.

Who owns Santiago RD over South Fork Montour Run?

It is owned by the State Highway Agency.