US Bridges

US 40 Alt over Porter Run

Fair

Allegany County, Maryland · .04 Miles West of Md 743 · Structure no. 100000010024020

Built
1948
77 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
26 ft
Daily traffic
9,951
2018 count
Owner
State
State Highway Agency

About this bridge

US 40 Alt over Porter Run is a concrete culvert carrying US 40 Alt over Porter Run in Allegany County, Maryland. It was built in 1948, so it is 77 years old, older than the Maryland average of 52.6 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.

It carries about 9,951 vehicles a day, roughly 8% of them trucks, projected to reach 9,961 by 2038. The structure is 26 ft (7.8 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 40 Alt
CrossesPorter Run
Location.04 Miles West of Md 743
RouteU.S. Route 40
CountyAllegany County
StateMaryland
Coordinates39.64976, -78.89411
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans0
Design loadH 20
Structure length26 ft (7.8 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,951 (2018)
Projected traffic9,961 by 2038
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 US 40 Alt over Porter Run built?

It was built in 1948, making it 77 years old in 2025.

What condition is US 40 Alt over Porter 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 January 2025.

How much traffic does US 40 Alt over Porter Run carry?

About 9,951 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is US 40 Alt over Porter Run?

The structure is 26 ft (7.8 m) long with a longest span of 12 ft (3.7 m).

Who owns US 40 Alt over Porter Run?

It is owned by the State Highway Agency.