US Bridges

31st Street over Mill Run Creek

Fair

Blair County, Pennsylvania · 31st.STREET Altoona · Structure no. 000000000005984

Built
1995
30 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
37 ft
2 main spans
Daily traffic
5,432
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

31st Street over Mill Run Creek is a concrete culvert carrying 31st Street over Mill Run Creek in Blair County, Pennsylvania. It was built in 1995, so it is 30 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 6 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 5,432 vehicles a day, roughly 4% of them trucks, projected to reach 7,316 by 2043. The structure is 37 ft (11.3 m) long and 121 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries31st Street
CrossesMill Run Creek
Location31st.STREET Altoona
RouteCity Street 0
Coordinates40.4961, -78.41302
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating52 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length37 ft (11.3 m)
Longest span12 ft (3.7 m)
Deck width121 ft (36.9 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,432 (2023)
Projected traffic7,316 by 2043
Trucks4%
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

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 31st Street over Mill Run Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is 31st Street over Mill Run 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 June 2023.

How much traffic does 31st Street over Mill Run Creek carry?

About 5,432 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is 31st Street over Mill Run Creek?

The structure is 37 ft (11.3 m) long with a longest span of 12 ft (3.7 m) and a deck 121 ft wide.

Who owns 31st Street over Mill Run Creek?

It is owned by the City or Municipal Highway Agency.