US Bridges

Main ST Ramp over Monacacy Cr.Rr Conestoga

Fair

Lehigh County, Pennsylvania · City of Bethlehem · Structure no. 000000000023518

Built
1920
105 years old, rebuilt 1990
Condition
Fair
inspected May 2024
Type
Arch - Deck
Concrete
Length
659 ft
5 main spans
Daily traffic
1,000
1980 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main ST Ramp over Monacacy Cr.Rr Conestoga is a concrete arch - deck carrying Main ST Ramp over Monacacy Cr.Rr Conestoga in Lehigh County, Pennsylvania. It was built in 1920 and reconstructed in 1990, so it is 105 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 1,000 vehicles a day, roughly 1% of them trucks, projected to reach 2,536 by 2030. The structure is 659 ft (200.9 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMain ST Ramp
CrossesMonacacy Cr.Rr Conestoga
LocationCity of Bethlehem
RouteCity Street 0
CountyLehigh County
StatePennsylvania
Coordinates40.61873, -75.38315
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
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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54 US tons
Inventory rating37 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length659 ft (200.9 m)
Longest span129 ft (39.3 m)
Deck width62 ft (18.9 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (1980)
Projected traffic2,536 by 2030
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
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 statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST Ramp over Monacacy Cr.Rr Conestoga built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1990.

What condition is Main ST Ramp over Monacacy Cr.Rr Conestoga 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 2024.

How much traffic does Main ST Ramp over Monacacy Cr.Rr Conestoga carry?

About 1,000 vehicles per day (1980 count), of which roughly 1% are trucks.

How long is Main ST Ramp over Monacacy Cr.Rr Conestoga?

The structure is 659 ft (200.9 m) long with a longest span of 129 ft (39.3 m) and a deck 62 ft wide.

Who owns Main ST Ramp over Monacacy Cr.Rr Conestoga?

It is owned by the City or Municipal Highway Agency.