US Bridges

Milltown Road over Plum Creek

Fair

Allegheny County, Pennsylvania · 1/4 MI E of SR 2058 · Structure no. 000000000001637

Built
1979
46 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
56 ft
1 main span
Daily traffic
2,080
2024 count
Owner
State
State Highway Agency

About this bridge

Milltown Road over Plum Creek is a steel stringer/multi-beam or girder carrying Milltown Road over Plum Creek in Allegheny County, Pennsylvania. It was built in 1979, so it is 46 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 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 2,080 vehicles a day, roughly 5% of them trucks, projected to reach 2,777 by 2032. The structure is 56 ft (17.1 m) long and 23 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMilltown Road
CrossesPlum Creek
Location1/4 MI E of SR 2058
RouteState Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.51131, -79.79354
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating89 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckClosed grating
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span51 ft (15.5 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,080 (2024)
Projected traffic2,777 by 2032
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$471,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Milltown Road over Plum Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Milltown Road over Plum Creek 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 March 2024.

How much traffic does Milltown Road over Plum Creek carry?

About 2,080 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Milltown Road over Plum Creek?

The structure is 56 ft (17.1 m) long with a longest span of 51 ft (15.5 m) and a deck 23 ft wide.

Who owns Milltown Road over Plum Creek?

It is owned by the State Highway Agency.