US Bridges

SR 104 over Mahantango Creek

Good

Snyder County, Pennsylvania · Juniata-Snyder CO Line · Structure no. 000000000031085

Built
1930
95 years old, rebuilt 2023
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
133 ft
1 main span
Daily traffic
2,660
2024 count
Owner
State
State Highway Agency

About this bridge

SR 104 over Mahantango Creek is a steel stringer/multi-beam or girder carrying SR 104 over Mahantango Creek in Snyder County, Pennsylvania. It was built in 1930 and reconstructed in 2023, so it is 95 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,660 vehicles a day, roughly 15% of them trucks, projected to reach 3,895 by 2032. The structure is 133 ft (40.5 m) long and 34 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

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CarriesSR 104
CrossesMahantango Creek
LocationJuniata-Snyder CO Line
RouteState Highway 104
CountySnyder County
StatePennsylvania
Coordinates40.64703, -76.96512
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61.8 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length133 ft (40.5 m)
Longest span90 ft (27.4 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,660 (2024)
Projected traffic3,895 by 2032
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$241,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 104 over Mahantango Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2023.

What condition is SR 104 over Mahantango 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 October 2023.

How much traffic does SR 104 over Mahantango Creek carry?

About 2,660 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is SR 104 over Mahantango Creek?

The structure is 133 ft (40.5 m) long with a longest span of 90 ft (27.4 m) and a deck 34 ft wide.

Who owns SR 104 over Mahantango Creek?

It is owned by the State Highway Agency.