US Bridges

Walnut Avenue over Mill Run

Fair

Blair County, Pennsylvania · Walnut Ave.@ 31st.STREET · Structure no. 000000000005994

Built
1993
32 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
29 ft
1 main span
Daily traffic
1,280
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Walnut Avenue over Mill Run is a prestressed concrete box beam or girders - multiple carrying Walnut Avenue over Mill Run in Blair County, Pennsylvania. It was built in 1993, so it is 32 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 1,280 vehicles a day, roughly 3% of them trucks, projected to reach 1,724 by 2043. The structure is 29 ft (8.8 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesWalnut Avenue
CrossesMill Run
LocationWalnut Ave.@ 31st.STREET
RouteCity Street 0
CountyBlair County
StatePennsylvania
Coordinates40.49968, -78.42041
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating85 US tons
Inventory rating35.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length29 ft (8.8 m)
Longest span24 ft (7.3 m)
Deck width49 ft (14.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,280 (2023)
Projected traffic1,724 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Walnut Avenue over Mill Run built?

It was built in 1993, making it 32 years old in 2025.

What condition is Walnut Avenue over Mill 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 May 2023.

How much traffic does Walnut Avenue over Mill Run carry?

About 1,280 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Walnut Avenue over Mill Run?

The structure is 29 ft (8.8 m) long with a longest span of 24 ft (7.3 m) and a deck 49 ft wide.

Who owns Walnut Avenue over Mill Run?

It is owned by the City or Municipal Highway Agency.