US Bridges

River RD (sr 66) over Carnahan Run

Good

Armstrong County, Pennsylvania · Carnahan Run NO.1 · Structure no. 000000000053452

Built
2018
7 years old
Condition
Good
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
2,541
2024 count
Owner
State
State Highway Agency

About this bridge

River RD (sr 66) over Carnahan Run is a prestressed concrete box beam or girders - multiple carrying River RD (sr 66) over Carnahan Run in Armstrong County, Pennsylvania. It was built in 2018, so it is 7 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,541 vehicles a day, roughly 7% of them trucks, projected to reach 3,556 by 2037. The structure is 100 ft (30.5 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesRiver RD (sr 66)
CrossesCarnahan Run
LocationCarnahan Run NO.1
RouteState Highway 66
CountyArmstrong County
StatePennsylvania
Coordinates40.61248, -79.58363
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating43.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length100 ft (30.5 m)
Longest span96 ft (29.3 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,541 (2024)
Projected traffic3,556 by 2037
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byPrivate (other than railroad)
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was River RD (sr 66) over Carnahan Run built?

It was built in 2018, making it 7 years old in 2025.

What condition is River RD (sr 66) over Carnahan 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 August 2024.

How much traffic does River RD (sr 66) over Carnahan Run carry?

About 2,541 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is River RD (sr 66) over Carnahan Run?

The structure is 100 ft (30.5 m) long with a longest span of 96 ft (29.3 m) and a deck 38 ft wide.

Who owns River RD (sr 66) over Carnahan Run?

It is owned by the State Highway Agency and maintained by the Private (other than railroad).