US Bridges

US 29 NB over Frederick Road

Fair

Howard County, Maryland · 0.54 Mile South of US 40 · Structure no. 100000130010011

Built
1948
77 years old, rebuilt 2003
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
137 ft
3 main spans
Daily traffic
130,203
2009 count
Owner
State
State Highway Agency

About this bridge

US 29 NB over Frederick Road is a steel continuous stringer/multi-beam or girder carrying US 29 NB over Frederick Road in Howard County, Maryland. It was built in 1948 and reconstructed in 2003, so it is 77 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 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 130,203 vehicles a day, roughly 8% of them trucks, projected to reach 209,363 by 2029. The structure is 137 ft (41.8 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 NB
CrossesFrederick Road
Location0.54 Mile South of US 40
RouteU.S. Route 29
CountyHoward County
StateMaryland
Coordinates39.2701, -76.81804
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length137 ft (41.8 m)
Longest span51 ft (15.5 m)
Deck width70 ft (21.3 m)
Roadway width67 ft (20.4 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 NB over Frederick Road built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 2003.

What condition is US 29 NB 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 NB over Frederick Road carry?

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

How long is US 29 NB over Frederick Road?

The structure is 137 ft (41.8 m) long with a longest span of 51 ft (15.5 m) and a deck 70 ft wide.

Who owns US 29 NB over Frederick Road?

It is owned by the State Highway Agency.