US Bridges

William Flynn HWY over West Branch Deer Creek

Good

Allegheny County, Pennsylvania · @ Intersection W/Sr 0910 · Structure no. 000000000054094

Built
2018
7 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete
Length
28 ft
1 main span
Daily traffic
36,107
2024 count
Owner
State
State Highway Agency

About this bridge

William Flynn HWY over West Branch Deer Creek is a concrete culvert carrying William Flynn HWY over West Branch Deer Creek in Allegheny County, Pennsylvania. It was built in 2018, so it is 7 years old, younger than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 36,107 vehicles a day, roughly 12% of them trucks, projected to reach 14,528 by 2037. The structure is 28 ft (8.5 m) long and 70 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesWilliam Flynn HWY
CrossesWest Branch Deer Creek
Location@ Intersection W/Sr 0910
RouteState Highway 8
Coordinates40.63564, -79.93934
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating39.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width70 ft (21.3 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,107 (2024)
Projected traffic14,528 by 2037
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byPrivate (other than railroad)
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was William Flynn HWY over West Branch Deer Creek built?

It was built in 2018, making it 7 years old in 2025.

What condition is William Flynn HWY over West Branch Deer Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does William Flynn HWY over West Branch Deer Creek carry?

About 36,107 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is William Flynn HWY over West Branch Deer Creek?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 70 ft wide.

Who owns William Flynn HWY over West Branch Deer Creek?

It is owned by the State Highway Agency and maintained by the Private (other than railroad).