US Bridges

US 29 SB over Frederick Road

Fair

Howard County, Maryland · 0.54 Mile South of US 40 · Structure no. 100000130010012

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
135 ft
3 main spans
Daily traffic
130,203
2009 count
Owner
State
State Highway Agency

About this bridge

US 29 SB over Frederick Road is a steel stringer/multi-beam or girder carrying US 29 SB over Frederick Road in Howard County, Maryland. It was built in 1966, so it is 59 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 130,203 vehicles a day, roughly 8% of them trucks, projected to reach 209,363 by 2029. The structure is 135 ft (41.1 m) long and 70 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 29 SB
CrossesFrederick Road
Location0.54 Mile South of US 40
RouteU.S. Route 29
CountyHoward County
StateMaryland
Coordinates39.27063, -76.81834
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length135 ft (41.1 m)
Longest span54 ft (16.5 m)
Deck width70 ft (21.3 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130,203 (2009)
Projected traffic209,363 by 2029
Trucks8%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 29 SB over Frederick Road built?

It was built in 1966, making it 59 years old in 2025.

What condition is US 29 SB over Frederick Road 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 March 2023.

How much traffic does US 29 SB over Frederick Road carry?

About 130,203 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 29 SB over Frederick Road?

The structure is 135 ft (41.1 m) long with a longest span of 54 ft (16.5 m) and a deck 70 ft wide.

Who owns US 29 SB over Frederick Road?

It is owned by the State Highway Agency.