US Bridges

On Ramp 29th Stree over I-83 NB

Poor

Baltimore city, Maryland · 29th ST at I-83 · Structure no. 200000BC3104010

Built
1959
66 years old, rebuilt 1988
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
341 ft
6 main spans
Daily traffic
23,318
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

On Ramp 29th Stree over I-83 NB is a steel stringer/multi-beam or girder carrying On Ramp 29th Stree over I-83 NB in Baltimore city, Maryland. It was built in 1959 and reconstructed in 1988, so it is 66 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 23,318 vehicles a day, roughly 8% of them trucks, projected to reach 28,566 by 2044. The structure is 341 ft (103.9 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

No coordinates are recorded for this structure.

CarriesOn Ramp 29th Stree
CrossesI-83 NB
Location29th ST at I-83
RouteInterstate 83
CountyBaltimore city
StateMaryland
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating98.4 US tons
Inventory rating59 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length341 ft (103.9 m)
Longest span66 ft (20.1 m)
Deck width30 ft (9.1 m)
Roadway width23 ft (7 m)
Vertical clearance over deck19 ft (5.8 m)

Traffic and service

Average daily traffic23,318 (2024)
Projected traffic28,566 by 2044
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$31,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was On Ramp 29th Stree over I-83 NB built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1988.

What condition is On Ramp 29th Stree over I-83 NB in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does On Ramp 29th Stree over I-83 NB carry?

About 23,318 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is On Ramp 29th Stree over I-83 NB?

The structure is 341 ft (103.9 m) long with a longest span of 66 ft (20.1 m) and a deck 30 ft wide.

Who owns On Ramp 29th Stree over I-83 NB?

It is owned by the City or Municipal Highway Agency.