US Bridges

North Spring Road over Mill Run

PoorPosted for load

Mercer County, Pennsylvania · 400-FT N of Millburn RD · Structure no. 000000000026273

Built
1922
103 years old
Condition
Poor
inspected August 2023
Type
Tee Beam
Concrete
Length
26 ft
1 main span
Daily traffic
98
2022 count
Owner
County
County Highway Agency

About this bridge

North Spring Road over Mill Run is a concrete tee beam carrying North Spring Road over Mill Run in Mercer County, Pennsylvania. It was built in 1922, so it is 103 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 98 vehicles a day, roughly 4% of them trucks, projected to reach 160 by 2039. The structure is 26 ft (7.9 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesNorth Spring Road
CrossesMill Run
Location400-FT N of Millburn RD
RouteCity Street 7226
Coordinates41.16745, -80.19437
Functional classRural Minor Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98 (2022)
Projected traffic160 by 2039
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

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$1,000
NavigationNo navigation control on waterway

Frequently asked questions

When was North Spring Road over Mill Run built?

It was built in 1922, making it 103 years old in 2025.

What condition is North Spring Road over Mill 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 North Spring Road over Mill Run carry?

About 98 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is North Spring Road over Mill Run?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 20 ft wide.

Who owns North Spring Road over Mill Run?

It is owned by the County Highway Agency.