US Bridges

T-439 Whipporwill over Mulligan Run

Fair

Butler County, Pennsylvania · 1.1 Miles West of SR 422 · Structure no. 000000000008234

Built
1916
109 years old
Condition
Fair
inspected November 2023
Type
Other
Concrete
Length
31 ft
1 main span
Daily traffic
50
2017 count
Owner
County
County Highway Agency

About this bridge

T-439 Whipporwill over Mulligan Run is a concrete other carrying T-439 Whipporwill over Mulligan Run in Butler County, Pennsylvania. It was built in 1916, so it is 109 years old, older 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 50 vehicles a day, roughly 9% of them trucks, projected to reach 70 by 2037. The structure is 31 ft (9.4 m) long and 17 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesT-439 Whipporwill
CrossesMulligan Run
Location1.1 Miles West of SR 422
RouteCity Street 0
CountyButler County
StatePennsylvania
Coordinates40.88999, -79.99947
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
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating49.1 US tons

Structure

Structure typeOther
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width17 ft (5.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2017)
Projected traffic70 by 2037
Trucks9%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$96,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-439 Whipporwill over Mulligan Run built?

It was built in 1916, making it 109 years old in 2025.

What condition is T-439 Whipporwill over Mulligan 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 November 2023.

How much traffic does T-439 Whipporwill over Mulligan Run carry?

About 50 vehicles per day (2017 count), of which roughly 9% are trucks.

How long is T-439 Whipporwill over Mulligan Run?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 17 ft wide.

Who owns T-439 Whipporwill over Mulligan Run?

It is owned by the County Highway Agency.