US Bridges

US 29 SB over Little Patuxent River

Fair

Howard County, Maryland · 1.62 Miles S of Md 175 · Structure no. 100000130012012

Built
1950
75 years old, rebuilt 1998
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
79 ft
1 main span
Daily traffic
73,292
2009 count
Owner
State
State Highway Agency

About this bridge

US 29 SB over Little Patuxent River is a steel stringer/multi-beam or girder carrying US 29 SB over Little Patuxent River in Howard County, Maryland. It was built in 1950 and reconstructed in 1998, so it is 75 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 73,292 vehicles a day, roughly 8% of them trucks, projected to reach 42,426 by 2026. The structure is 79 ft (24.1 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 29 SB
CrossesLittle Patuxent River
Location1.62 Miles S of Md 175
RouteU.S. Route 29
Coordinates39.20466, -76.85806
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.5 US tons
Inventory rating55 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length79 ft (24.1 m)
Longest span75 ft (22.9 m)
Deck width37 ft (11.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73,292 (2009)
Projected traffic42,426 by 2026
Trucks8%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$191,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 29 SB over Little Patuxent River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1998.

What condition is US 29 SB over Little Patuxent River 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 April 2023.

How much traffic does US 29 SB over Little Patuxent River carry?

About 73,292 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 29 SB over Little Patuxent River?

The structure is 79 ft (24.1 m) long with a longest span of 75 ft (22.9 m) and a deck 37 ft wide.

Who owns US 29 SB over Little Patuxent River?

It is owned by the State Highway Agency.