US Bridges

Enlow RD over Montour Run

Fair

Allegheny County, Pennsylvania · MT20 Montour Run No. 20 · Structure no. 000000000002288

Built
1934
91 years old, rebuilt 2014
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
550
2015 count
Owner
County
County Highway Agency

About this bridge

Enlow RD over Montour Run is a concrete slab carrying Enlow RD over Montour Run in Allegheny County, Pennsylvania. It was built in 1934 and reconstructed in 2014, so it is 91 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 550 vehicles a day, roughly 3% of them trucks, projected to reach 600 by 2035. The structure is 23 ft (7 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesEnlow RD
CrossesMontour Run
LocationMT20 Montour Run No. 20
RouteCounty Highway 0
CountyAllegheny County
StatePennsylvania
Coordinates40.45511, -80.23375
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating65 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2015)
Projected traffic600 by 2035
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$144,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Enlow RD over Montour Run built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 2014.

What condition is Enlow RD over Montour Run 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 September 2023.

How much traffic does Enlow RD over Montour Run carry?

About 550 vehicles per day (2015 count), of which roughly 3% are trucks.

How long is Enlow RD over Montour Run?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 26 ft wide.

Who owns Enlow RD over Montour Run?

It is owned by the County Highway Agency.