US Bridges

US 29 NB over US 40

Fair

Howard County, Maryland · 1.35 Miles South of Is 70 · Structure no. 100000130011011

Built
1966
59 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
296 ft
6 main spans
Daily traffic
98,360
2009 count
Owner
State
State Highway Agency

About this bridge

US 29 NB over US 40 is a steel stringer/multi-beam or girder carrying US 29 NB over US 40 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 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 98,360 vehicles a day, roughly 8% of them trucks, projected to reach 150,720 by 2029. The structure is 296 ft (90.2 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 29 NB
CrossesUS 40
Location1.35 Miles South of Is 70
RouteU.S. Route 29
CountyHoward County
StateMaryland
Coordinates39.27716, -76.82043
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.5 US tons
Inventory rating26.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length296 ft (90.2 m)
Longest span67 ft (20.4 m)
Deck width59 ft (18 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98,360 (2009)
Projected traffic150,720 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 29 NB over US 40 built?

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

What condition is US 29 NB over US 40 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 2024.

How much traffic does US 29 NB over US 40 carry?

About 98,360 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 29 NB over US 40?

The structure is 296 ft (90.2 m) long with a longest span of 67 ft (20.4 m) and a deck 59 ft wide.

Who owns US 29 NB over US 40?

It is owned by the State Highway Agency.