US Bridges

T-488 Blue Spruce over Crooked Creek

Fair

Indiana County, Pennsylvania · Btw T494 & SR4008 · Structure no. 000000000019504

Built
1984
41 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

T-488 Blue Spruce over Crooked Creek is a prestressed concrete box beam or girders - multiple carrying T-488 Blue Spruce over Crooked Creek in Indiana County, Pennsylvania. It was built in 1984, so it is 41 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 140 by 2043. The structure is 73 ft (22.3 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesT-488 Blue Spruce
CrossesCrooked Creek
LocationBtw T494 & SR4008
RouteCity Street 488
Coordinates40.70226, -79.1689
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating14 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length73 ft (22.3 m)
Longest span72 ft (21.9 m)
Deck width32 ft (9.9 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic140 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was T-488 Blue Spruce over Crooked Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is T-488 Blue Spruce over Crooked 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 October 2023.

How much traffic does T-488 Blue Spruce over Crooked Creek carry?

About 100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is T-488 Blue Spruce over Crooked Creek?

The structure is 73 ft (22.3 m) long with a longest span of 72 ft (21.9 m) and a deck 32 ft wide.

Who owns T-488 Blue Spruce over Crooked Creek?

It is owned by the County Highway Agency.