US Bridges

T-543 Grist Mill over Lower Little Swatara CR

FairPosted for load

Schuylkill County, Pennsylvania · 0.1 MI South of SR 895 · Structure no. 000000000030957

Built
1974
51 years old, rebuilt 1977
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
50
1981 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T-543 Grist Mill over Lower Little Swatara CR is a prestressed concrete box beam or girders - multiple carrying T-543 Grist Mill over Lower Little Swatara CR in Schuylkill County, Pennsylvania. It was built in 1974 and reconstructed in 1977, so it is 51 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 70 by 2001. The structure is 31 ft (9.4 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesT-543 Grist Mill
CrossesLower Little Swatara CR
Location0.1 MI South of SR 895
RouteCity Street 0
Coordinates40.55087, -76.27229
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
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 rating39 US tons
Inventory rating21.1 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width26 ft (8 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1981)
Projected traffic70 by 2001
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$18,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-543 Grist Mill over Lower Little Swatara CR built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 1977.

What condition is T-543 Grist Mill over Lower Little Swatara CR 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 August 2024.

How much traffic does T-543 Grist Mill over Lower Little Swatara CR carry?

About 50 vehicles per day (1981 count).

How long is T-543 Grist Mill over Lower Little Swatara CR?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 26 ft wide.

Who owns T-543 Grist Mill over Lower Little Swatara CR?

It is owned by the Town or Township Highway Agency.