US Bridges

T-386 Dobson RD over Big Run

PoorClosed to traffic

Jefferson County, Pennsylvania · 0.2 Miles East of SR 3014 · Structure no. 000000000019852

Built
1901
124 years old
Condition
Poor
inspected August 2023
Type
Truss - Thru
Steel
Length
68 ft
1 main span
Daily traffic
—
2012 count
Owner
County
County Highway Agency

About this bridge

T-386 Dobson RD over Big Run is a steel truss - thru carrying T-386 Dobson RD over Big Run in Jefferson County, Pennsylvania. It was built in 1901, so it is 124 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.

No traffic count is recorded. The structure is 68 ft (20.7 m) long and 12 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesT-386 Dobson RD
CrossesBig Run
Location0.2 Miles East of SR 3014
RouteCity Street 0
Coordinates41.02129, -79.1298
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, 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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating8 US tons
Inventory rating5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length68 ft (20.7 m)
Longest span65 ft (19.8 m)
Deck width12 ft (3.8 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic—
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$372,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-386 Dobson RD over Big Run built?

It was built in 1901, making it 124 years old in 2025.

What condition is T-386 Dobson RD over Big Run in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does T-386 Dobson RD over Big Run carry?

No traffic count is recorded for this structure.

How long is T-386 Dobson RD over Big Run?

The structure is 68 ft (20.7 m) long with a longest span of 65 ft (19.8 m) and a deck 12 ft wide.

Who owns T-386 Dobson RD over Big Run?

It is owned by the County Highway Agency.