US Bridges

T-306 Steam Mill R over Mckinnon Branch

PoorPosted for load

Cameron County, Pennsylvania · 4300 Ft NE of Pa 120 · Structure no. 000000000008955

Built
1940
85 years old
Condition
Poor
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
27 ft
1 main span
Daily traffic
25
2019 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T-306 Steam Mill R over Mckinnon Branch is a steel stringer/multi-beam or girder carrying T-306 Steam Mill R over Mckinnon Branch in Cameron County, Pennsylvania. It was built in 1940, so it is 85 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: posted for load restriction.

It carries about 25 vehicles a day, projected to reach 40 by 2039. The structure is 27 ft (8.2 m) long and 14 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesT-306 Steam Mill R
CrossesMckinnon Branch
Location4300 Ft NE of Pa 120
RouteCity Street 0
Coordinates41.4642, -78.1734
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating5 US tons
Inventory rating3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span26 ft (7.9 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2019)
Projected traffic40 by 2039
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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$216,000
NavigationNo navigation control on waterway

Frequently asked questions

When was T-306 Steam Mill R over Mckinnon Branch built?

It was built in 1940, making it 85 years old in 2025.

What condition is T-306 Steam Mill R over Mckinnon Branch 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 April 2023.

How much traffic does T-306 Steam Mill R over Mckinnon Branch carry?

About 25 vehicles per day (2019 count).

How long is T-306 Steam Mill R over Mckinnon Branch?

The structure is 27 ft (8.2 m) long with a longest span of 26 ft (7.9 m) and a deck 14 ft wide.

Who owns T-306 Steam Mill R over Mckinnon Branch?

It is owned by the Town or Township Highway Agency.