US Bridges

SR4001 over Mitchell Run

Fair

Indiana County, Pennsylvania · Black Walnut · Structure no. 000000000019369

Built
1936
89 years old, rebuilt 1991
Condition
Fair
inspected November 2024
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
495
2023 count
Owner
State
State Highway Agency

About this bridge

SR4001 over Mitchell Run is a concrete slab carrying SR4001 over Mitchell Run in Indiana County, Pennsylvania. It was built in 1936 and reconstructed in 1991, so it is 89 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 495 vehicles a day, roughly 22% of them trucks, projected to reach 618 by 2032. The structure is 24 ft (7.3 m) long and 28 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSR4001
CrossesMitchell Run
LocationBlack Walnut
RouteState Highway 0
CountyIndiana County
StatePennsylvania
Coordinates40.68079, -79.26257
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadH 20
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic495 (2023)
Projected traffic618 by 2032
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 SR4001 over Mitchell Run built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1991.

What condition is SR4001 over Mitchell 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 November 2024.

How much traffic does SR4001 over Mitchell Run carry?

About 495 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is SR4001 over Mitchell Run?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 28 ft wide.

Who owns SR4001 over Mitchell Run?

It is owned by the State Highway Agency.