US Bridges

Donaldson RD over North Fork Robinson Run

Fair

Allegheny County, Pennsylvania · @ N Branch RD (sr 3108) · Structure no. 000000000001799

Built
1975
50 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete
Length
28 ft
1 main span
Daily traffic
2,133
2024 count
Owner
State
State Highway Agency

About this bridge

Donaldson RD over North Fork Robinson Run is a concrete slab carrying Donaldson RD over North Fork Robinson Run in Allegheny County, Pennsylvania. It was built in 1975, so it is 50 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 2,133 vehicles a day, roughly 7% of them trucks, projected to reach 1,470 by 2038. The structure is 28 ft (8.5 m) long and 40 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesDonaldson RD
CrossesNorth Fork Robinson Run
Location@ N Branch RD (sr 3108)
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.41664, -80.22057
Functional classRural Local

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span25 ft (7.6 m)
Deck width40 ft (12.1 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,133 (2024)
Projected traffic1,470 by 2038
Trucks7%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$76,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Donaldson RD over North Fork Robinson Run built?

It was built in 1975, making it 50 years old in 2025.

What condition is Donaldson RD over North Fork Robinson 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 2023.

How much traffic does Donaldson RD over North Fork Robinson Run carry?

About 2,133 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Donaldson RD over North Fork Robinson Run?

The structure is 28 ft (8.5 m) long with a longest span of 25 ft (7.6 m) and a deck 40 ft wide.

Who owns Donaldson RD over North Fork Robinson Run?

It is owned by the State Highway Agency.