US Bridges

Summit Avenue over CSXT Railroad

Good

Montgomery County, Maryland · 0.14 Mile North of Md 547 · Structure no. 200000M-0086010

Built
1996
29 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
54 ft
1 main span
Daily traffic
9,746
2023 count
Owner
County
County Highway Agency

About this bridge

Summit Avenue over CSXT Railroad is a steel stringer/multi-beam or girder carrying Summit Avenue over CSXT Railroad in Montgomery County, Maryland. It was built in 1996, so it is 29 years old, younger than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,746 vehicles a day, roughly 2% of them trucks, projected to reach 11,498 by 2043. The structure is 54 ft (16.5 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSummit Avenue
CrossesCSXT Railroad
Location0.14 Mile North of Md 547
RouteCounty Highway 307
CountyMontgomery County
StateMaryland
Coordinates39.02967, -77.07804
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69 US tons
Inventory rating41.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span50 ft (15.2 m)
Deck width38 ft (11.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,746 (2023)
Projected traffic11,498 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$8,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Summit Avenue over CSXT Railroad built?

It was built in 1996, making it 29 years old in 2025.

What condition is Summit Avenue over CSXT Railroad in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does Summit Avenue over CSXT Railroad carry?

About 9,746 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Summit Avenue over CSXT Railroad?

The structure is 54 ft (16.5 m) long with a longest span of 50 ft (15.2 m) and a deck 38 ft wide.

Who owns Summit Avenue over CSXT Railroad?

It is owned by the County Highway Agency.