US Bridges

T-390 Back Road over Drake Run

FairPosted for load

Somerset County, Pennsylvania · 3.5 Mi.N.Of Confluence · Structure no. 000000000031867

Built
1915
110 years old
Condition
Fair
inspected September 2024
Type
Arch - Deck
Concrete
Length
26 ft
1 main span
Daily traffic
25
2024 count
Owner
County
County Highway Agency

About this bridge

T-390 Back Road over Drake Run is a concrete arch - deck carrying T-390 Back Road over Drake Run in Somerset County, Pennsylvania. It was built in 1915, so it is 110 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 25 vehicles a day, roughly 1% of them trucks, projected to reach 31 by 2044. The structure is 26 ft (7.9 m) long and 17 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesT-390 Back Road
CrossesDrake Run
Location3.5 Mi.N.Of Confluence
RouteCity Street 0
CountySomerset County
StatePennsylvania
Coordinates39.86033, -79.36388
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83 US tons
Inventory rating49.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span26 ft (7.9 m)
Deck width17 ft (5.3 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2024)
Projected traffic31 by 2044
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$589,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-390 Back Road over Drake Run built?

It was built in 1915, making it 110 years old in 2025.

What condition is T-390 Back Road over Drake 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 September 2024.

How much traffic does T-390 Back Road over Drake Run carry?

About 25 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is T-390 Back Road over Drake Run?

The structure is 26 ft (7.9 m) long with a longest span of 26 ft (7.9 m) and a deck 17 ft wide.

Who owns T-390 Back Road over Drake Run?

It is owned by the County Highway Agency.