US Bridges

SR4021 Tan Hill RD over Over Thornbottom Creek

Fair

Tioga County, Pennsylvania · 3 MI South of Elkland · Structure no. 000000000033184

Built
1955
70 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
333
2024 count
Owner
State
State Highway Agency

About this bridge

SR4021 Tan Hill RD over Over Thornbottom Creek is a steel stringer/multi-beam or girder carrying SR4021 Tan Hill RD over Over Thornbottom Creek in Tioga County, Pennsylvania. It was built in 1955, so it is 70 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 6 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 333 vehicles a day, roughly 4% of them trucks, projected to reach 236 by 2032. The structure is 28 ft (8.5 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR4021 Tan Hill RD
CrossesOver Thornbottom Creek
Location3 MI South of Elkland
RouteState Highway 0
CountyTioga County
StatePennsylvania
Coordinates41.95413, -77.32233
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating69 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic333 (2024)
Projected traffic236 by 2032
Trucks4%
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

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$83,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR4021 Tan Hill RD over Over Thornbottom Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is SR4021 Tan Hill RD over Over Thornbottom 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 August 2024.

How much traffic does SR4021 Tan Hill RD over Over Thornbottom Creek carry?

About 333 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is SR4021 Tan Hill RD over Over Thornbottom Creek?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 27 ft wide.

Who owns SR4021 Tan Hill RD over Over Thornbottom Creek?

It is owned by the State Highway Agency.