US Bridges

SR 4025 (lr 39059) over Lyon Creek

Fair

Lehigh County, Pennsylvania · Kistler Road · Structure no. 000000000023402

Built
1949
76 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
59 ft
1 main span
Daily traffic
351
2023 count
Owner
State
State Highway Agency

About this bridge

SR 4025 (lr 39059) over Lyon Creek is a steel stringer/multi-beam or girder carrying SR 4025 (lr 39059) over Lyon Creek in Lehigh County, Pennsylvania. It was built in 1949, so it is 76 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 351 vehicles a day, roughly 10% of them trucks, projected to reach 400 by 2032. The structure is 59 ft (18 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 4025 (lr 39059)
CrossesLyon Creek
LocationKistler Road
RouteState Highway 0
CountyLehigh County
StatePennsylvania
Coordinates40.63656, -75.67016
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating69 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans1
Design loadHS 20
Structure length59 ft (18 m)
Longest span55 ft (16.8 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic351 (2023)
Projected traffic400 by 2032
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

OwnerState Highway Agency
Maintained byState 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 SR 4025 (lr 39059) over Lyon Creek built?

It was built in 1949, making it 76 years old in 2025.

What condition is SR 4025 (lr 39059) over Lyon 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 May 2023.

How much traffic does SR 4025 (lr 39059) over Lyon Creek carry?

About 351 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 4025 (lr 39059) over Lyon Creek?

The structure is 59 ft (18 m) long with a longest span of 55 ft (16.8 m) and a deck 30 ft wide.

Who owns SR 4025 (lr 39059) over Lyon Creek?

It is owned by the State Highway Agency.